6:16 PM
Haribabu
1. Write a Java program that prints all real solutions to the quadratic equation ax2+bx+c=0.Read in a,b,c and use the quadratic formula.If the discriminant b2-4ac is negative,display a message stating that there are no real roots .
import java.util.Scanner;
class Solutions
{
public static void main(String args[])
{
int a,b,c;
double x,y;
Scanner s=new Scanner(System.in);
System.out.println("Enter the values of a,b, and c");
a=s.nextInt();
b=s.nextInt();
c=s.nextInt();
double f=(b*b)-4*a*c;
System.out.println("F value="+f);
if(f<0)
{
System.out.println("No real roots");
}
else
{
double l=Math.sqrt(f);
System.out.println("Math.sqrt(f)="+l);
x=((-b-l)/(2*a));
y=((-b+l)/(2*a));
System.out.println("Roots of given equation:"+x+"\t"+y);
}
}
}
Output:
Enter the values of a,b,c
2
5
2
Roots of given equation:-0.5 -2.0
2. Write a Java program that uses both recursive and non-recursive functions to print nth value in the Fibonacci sequence .
/*Without recursion*/
import java.util.Scanner;
class Fibonacci
{
public static void main(String[] input)
{
int x,y;
x=Integer.parseInt(input[0]);
y=Integer.parseInt(input[1]);
Scanner s=new Scanner(System.in);
System.out.println(“Enter the value of n:”);
int n=s.nextInt();
int z[]=new int[n];
z[0]=x;
z[1]=y;
for(int i=2;i<n;i++)
{
z[i]=z[i-1]+z[i-2];
}
System.out.println("<------------Fibonacii series------------>");
for(int i=0;i<n;i++)
{
System.out.println(z[i]);
}
}
}
Output:
>java Fibonacci 0 1
Enter the value of n:
8
<------------Fibonacii series------------>
0
1
1
2
3
5
8
13
/*With recursion*/
import java.util.Scanner;
class Fibwithrec
{
public static void main(String[] args)
{
Scanner s=new Scanner(System.in);
System.out.println("Enter the value of n:");
int n=s.nextInt();
System.out.println("Fibonacci series using recursion");
Fiboni f1=new Fiboni();
for(int i=0;i<n;i++)
System.out.println(f1.fibon(i));
}
}
class Fiboni
{
public int fibon(int n)
{
if(n==0 || n==1)
return 1;
else
return fibon(n-1)+fibon(n-2);
}
}
Output:
Enter the value of n:
10
Fibonacci series using recursion
1
1
2
3
5
8
13
21
34
55
3. Write a java program to calculate Factorial of a given number using “Recursion” concept .
import java.io.*;
import java.util.*;
class Factorial
{
int fact(int n)
{
int r;
if(n==1)
return 1;
else
r=fact(n-1)*n;
return r;
}
}
class Recursion
{
public static void main(String args[])throws IOException
{
Factorial f=new Factorial();
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter num to find factorial");
int x=Integer.parseInt(br.readLine());
int k=f.fact(x);
System.out.println("The fatorial of"+x+"is="+k);
}
}
Output:
Enter num to find factorial
5
The fatorial of5is=120
4. Write a java program to check whether given number is prime or not.
import java.util.*;
import java.lang.*;
class PrimeNum
{
public static void main(String args[ ])throws IOException
{
Scanner s=new Scanner(System.in);
System.out.println("Enter the value of n:");
int n=s.nextInt();
int count=0;
for(int i=1;i<=n;i++)
{
if((n%i)==0)
{
count++;
}
}
if(count==2)
{
System.out.println("the num is prime"+n);
}
else
{
System.out.println("the num is not a prime"+n);
}
}
}
Output:
Enter n value
11
the num is prime11
Enter n value
22
the num is not prime22
5. Write a Java program that prompts the user for an integer and then prints out all prime numbers upto that integer .
import java.util.Scanner;
class Prime
{
public static void main(String[] args)
{
int n,p;
Scanner s=new Scanner(System.in);
System.out.println("Enter upto which number prime numbers are needed");
n=s.nextInt();
System.out.println("<------------Prime numbers------------->");
for(int i=2;i<n;i++)
{
p=0;
for(int j=2;j<i;j++)
{
if(i%j==0)
p=1;
}
if(p==0)
System.out.println(i);
}
}
}
Output:
Enter upto which number prime numbers are needed
20
<------------Prime numbers------------->
2
3
5
7
11
13
17
19
6. Write a Java program to print prime numbers in a given range.
import java.util.*;
class PrimeRange
{
public static void main(String args[])
{
int i,j;
Scanner br =new Scanner(System.in);
System.out.println("Enter the starting range");
int s=br.nextInt();
System.out.println("Enter the end range");
int e=br.nextInt();
for(i=s;i<=e;i++)
{
int count=0;
for(j=1;j<=e;j++)
{
if((i%j)==0)
count++;
}
if(count==2)
{
System.out.println(i);
}
}
}
}
Output:
Enter the starting range
10
Enter the end range
30
…Prime series…
11
13
17
19
23
29
7. Write a java program to check whether given number is perfect or not.
import java.util.*;
public class PerfectNumber
{
public static void main(String[] args)
{
System.out.println("Enter any number");
Scanner input = new Scanner(System.in);
int num = input.nextInt();
int perfectNo = 0;
int i;
System.out.println("Factors are:");
for (i = 1; i < num; i++)
{
if (num % i == 0) {
perfectNo += i;
System.out.println(i);
}
}
if (perfectNo == num)
{
System.out.println("number is a perfect number");
} else {
System.out.println("number is not a perfect number");
}
}
Output:
Enter any number
28
Factors are:
1
2
7
14
number is a perfect number
8. Write a Java program to find the total and average of a student marks.
import java.io.*;
class DemoArray
{
public static void main (String args[]) throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter how many sub");
int n=Integer.parseInt(br.readLine());
int marks[]=new int[n];
for(int i=0;i<n;i++)
{
System.out.println("Enter subject"+(i+1)+"marks");
marks[i]=Integer.parseInt(br.readLine());
}
int tot=0;
System.out.println("The marks are");
for(int i=0;i<n;i++)
{
System.out.println(marks[i]);
tot=tot+marks[i];
}
System.out.println("Total marks="+tot);
float avg=(float)tot/n;
System.out.print("Avarage marks ="+avg);
}
}
Output:
Enter how many subjects
3
Enter subject1 marks
67
Enter subject2 marks
53
Enter subject3 marks
70
The Marks are
67
53
70
total marks=190
Avarage marks=63.333332
9. Write a Java program to display multiplication table.
import java.io.*;
class Multiplication
{
public static void main(String args[])throws IOException
{
Scanner s=new Scanner(System.in);
System.out.println("Enter n value");
int n=s.nextInt();
System.out.println("...Multiplication Table...");
for(int i=1;i<=10;i++)
System.out.println(n+"*"+i+"="+(n*i));
}
}
Output :
Enter n value
5
Multiplication table:
5*1=5
5*2=10
5*3=15
5*4=20
5*5=25
5*6=30
5*7=35
5*8=40
5*9=45
5*10=50
10. Write a Java program that checks whether the given string is palindrome or not.
class Palindrome
{
public static void main(String[] args)
{
StringBuffer s1=new StringBuffer(args[0]);
StringBuffer s2=new StringBuffer(s1);
s1.reverse();
System.out.println(“Given String is:”+s2);
System.out.println(“Reverse String is”+s1);
if(String.valueOf(s1).compareTo(String.valueOf(s2))==0)
System.out.println(“Palindrome”);
else
System.out.println(“Not Palindrome”);
}
}
Output:
Java palindrome madam
Given String is:madam
Reverse String is madam
Palindrome
Java palindrome 121
Given String is:121
Reverse String is 121
Palindrome
11. Write a Java program to sort a given list of names in ascending order.
class Sorting
{
public static void main(String[] input)
{
int k=input.length;
String temp=new String();
String names[]=new String[k+1];
for(int i=0;i<k;i++)
{
names[i]=input[i];
}
for(int i=0;i<k;i++)
for(int j=i+1;j<k;j++)
{
if(names[i].compareTo(names[j])<0)
{
temp=names[i];
names[i]=names[j];
names[j]=temp;
}
}
System.out.println(“Sorted order is”);
for(int i=0;i<k;i++)
{
System.out.println(names[i]);
}
}
}
Output:
Java sorting Harish Ramesh Mahesh Rakesh
Sorted order is
Ramesh
Rakesh
Mahesh
Harish
12. Write a Java Program to multiply two matrices.
import java.util.Scanner;
class Matmul
{
public static void main(String args[])
{
Scanner input=new Scanner(System.in);
System.out.println("Enter size of first matrix:");
int m=input.nextInt();
int n=input.nextInt();
System.out.println("Enter size of second matrix:");
int p=input.nextInt();
int q=input.nextInt();
int a[][]=new int[m][n];
int b[][]=new int[p][q];
int c[][]=new int[m][q];
System.out.println("Enter the first matrix:");
for(int i=0;i<m;i++)
for(int j=0;j<n;j++)
a[i][j]=input.nextInt();
System.out.println("Enter the second matrix:");
for(int i=0;i<p;i++)
for(int j=0;j<q;j++)
b[i][j]=input.nextInt();
System.out.println("Matrix multiplication is as follows:\n");
for(int i=0;i<m;i++)
{
for(int j=0;j<q;j++)
{
c[i][j]=0;
for(int k=0;k<n;k++)
{
c[i][j]+=a[i][k]*b[k][j];
}
}
}
System.out.println("First matrix:\n");
for(int i=0;i<m;i++)
{
for(int j=0;j<n;j++)
{
System.out.print(a[i][j]+"\t");
}
System.out.println("\n");
}
System.out.println("Second matrix:");
for(int i=0;i<p;i++)
{
for(int j=0;j<q;j++)
{
System.out.print(b[i][j]+"\t");
}
System.out.println("\n");
}
System.out.println("Multiplcation:");
for(int i=0;i<m;i++)
{
for(int j=0;j<q;j++)
{
System.out.print(c[i][j]+"\t");
}
System.out.println("\n");
}
}
}
Output:
Enter size of first matrix:
2
2
Enter size of second matrix:
2
2
Enter the first matrix:
1 2
3 4
Enter the second matrix:
1 2
3 4
Matrix multiplication is as follows:
First matrix:
1 2
3 4
Second matrix:
1 2
3 4
Multiplcation:
7 10
15 22
13. Write a java program for array copying method.
import java.io.*;
public class CopyArray
{
public static void main(String[] args)throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter array length ");
int n=Integer.parseInt(br.readLine());
String array1[]=new String[n];
String array2[]=new String[n];
System.out.println("Enter strings into array1: ");
System.out.println("...................................");
for(int i=0;i<n;i++)
{
System.out.println("Enter the string"+(i+1));
array1[i]=br.readLine();
}
System.out.println("Enter strings into array2: ");
System.out.println("...................................");
for(int i=0;i<n;i++)
{
System.out.println("Enter the string"+(i+1));
array2[i]=br.readLine();
}
System.out.println("Array1:");
System.out.print("[");
for (int i=0; i<n;i++)
{
System.out.print(" "+array1[i]);
}
System.out.print("]");
System.out.println("\nArray2:");
System.out.print("[");
for(int i=0; i<n; i++)
{
System.out.print(" "+ array2[i]);
}
System.out.print("]");
System.out.println("\nAfterCopying:");
System.out.print("[");
System.arraycopy(array1,0,array2,0,2);
for(int i=0;i<n;i++)
{
System.out.print(" "+array2[i]);
}
System.out.print("]");
}
}
Output:
Enter array length
5
Enter strings into array1:
...................................
Enter the string1
q
Enter the string2
w
Enter the string3
e
Enter the string4
r
Enter the string5
t
Enter strings into array2:
...................................
Enter the string1
a
Enter the string2
s
Enter the string3
d
Enter the string4
f
Enter the string5
g
Array1:
[ q w e r t]
Array2:
[ a s d f g]
AfterCopying:
[ q w d f g]
14. Write a program on “Static” method.
import java.io.*;
class StaticMethod
{
static int sum(int a,int b)
{
int c=a+b;
return c;
}
}
class Demo
{
public static void main(String args[])
{
int x=StaticMethod.sum(10,50);
System.out.println(x);
}
}
Output:
sum=60
15. Write a java application on “Static” variable.
import java.io.*;
class Test
{
static int x;
int y;
void inc()
{
x=x+1;
y=y+1;
}
void show()
{
System.out.println("x value is:"+x);
System.out.println("y value is:"+y);
}
}
class Static
{
public static void main(String args[])throws IOException
{
Test t1=new Test();
Test t2=new Test();
System.out.println("First obj values:");
t1.inc();
t1.show();
System.out.println("Second obj values:");
t2.inc();
t2.show();
}
}
Output:
First obj values:
x value is:1
y value is:1
Second obj values:
x value is:2
y value is:1
16. Write a program on “Constructor”.
class Rectangle
{
int l,w;
void getData(int x,int y)
{
l=x;
w=y;
}
int rectArea()
{
return(l*w);
}
}
class RectArea
{
public static void main(String args[ ])
{
Rectangle r1=new Rectangle( );
r1.getData(10,15);
int k=r1.rectArea( );
System.out.print("Area is:"+k);
}
}
Output :
Area is:150
17. Write a java program for “ This ” keyword .
import java.io.*;
class Test
{
int a,b;
void getData()
{
this.a=10;
this.b=20;
}
void show()
{
System.out.println("a value is:"+a);
System.out.println("b value is:"+b);
}
}
class This
{
public static void main(String args[])throws IOException
{
Test t=new Test();
t.getData();
t.show();
}
}
Output:
a value is:10
b value is:20
18. Write a java program on Command Line Arguments.
public class GetCommandLine
{
public static void main(String args[])
{
System.out.println("----->>Getting command line arguments --");
for(int i=0;i<args.length;i++)
{
System.out.println("Argument ["+(i+1)+"] is = "+args[i]);
}
}
}
Output:
>javac GetCommandLine.java
>java GetCommandLine 10 20 30 40 50
----->>Getting command line arguments --
Argument [1] is = 10
Argument [2] is = 20
Argument [3] is = 30
Argument [4] is = 40
Argument [5] is = 50
19. Write a program to find sum of given Command Line Arguments.
import java.io.*;
import java.lang.*;
public class Cmd
{
public static void main(String args[])throws IOException
{
int sum=0;
for(int i=0;i<args.length;i++)
{
int x=Integer.parseInt(args[i]);
sum+=x;
}
System.out.println("sum is="+sum);
}
}
Output:
>javac Cmd.java
>java Cmd 10 15 20 25 30
sum is=100
20. Write a program on Method Overloding.
import java.io.*;
class MethodOverLoad
{
void calValue()
{
int x=20;
x=x*x;
System.out.println("Sqrt of x is:"+x);
}
void calValue(int y)
{
y=y*y*y;
System.out.println("Cube of y is:"+y);
}
void calValue(int m,int n)
{
int z=m*n;
System.out.println("Product of m and n is:"+z);
}
}
class MOV
{
public static void main(String args[])throws IOException
{
MethodOverLoad m=new MethodOverLoad();
m.calValue();
m.calValue(10,20);
m.calValue(10);
}
}
Output:
Sqrt of x is:400
Product of m and n is:200
Cube of y is:1000
21. Write a program on Method Overriding.
import java.io.*;
class One
{
int calculate(int n)
{
return n;
}
}
class Two extends One
{
int calculate(int n)
{
return(n*n);
}
}
class MOR
{
public static void main(String args[])throws IOException
{
Two t=new Two();
int m=t.calculate(3);
System.out.println("Multiplication is:"+m);
}
}
Output:
Multiplication is:9
22. Write a program on Constructor Overloding.
class Test
{
int a,b;
Test()
{
a=1;
b=2;
}
Test(int x)
{
a=b=x;
}
Test(int a, int b)
{
this.a=a;
this.b=b;
}
void show()
{
System.out.println("a value is:"+a);
System.out.println("b value is:"+b);
}
}
class COL
{
public static void main(String args[])
{
Test t1=new Test();
t1.show();
Test t2=new Test(10);
t2.show();
Test t3=new Test(15,25);
t3.show();
}
}
Output:
a value is:1
b value is:2
a value is:10
b value is:10
a value is:15
b value is:25
23. Write a program on InnerClass concept.
class Outer
{
Inner in=new Inner();
class Inner
{
public void sayHello()
{
System.out.println("Hello");
}
}
}
class DemoInner
{
public static void main(String args[])
{
Outer o=new Outer();
o.in.sayHello();
}
}
Output:
Hello
24. Write a Java programme that reads a line of integers and displays each integer and sum of all integers using StringTokenizer class.
import java.util.StringTokenizer;
import java.util.Scanner;
class Tokens
{
public static void main(String[] args)
{
Scanner input=new Scanner(System.in);
System.out.println("Enter no. of tokens u want to add ");
String sentence=input.nextLine();
String temp;
int k,total=0;
StringTokenizer s1=new StringTokenizer(sentence);
System.out.println("Total Number of tokens:"+s1.countTokens());
System.out.println("Tokens are:");
while(s1.hasMoreTokens())
{
temp=s1.nextToken();
k=Integer.parseInt(temp);
total+=k;
System.out.print(k+"\t");
}
System.out.println("\nSum of tokens :"+total);
}
}
Output:
Enter no. of tokens u want to add
5 4 6 1 8 2
Total Number of tokens:6
Tokens are:
5 4 6 1 8 2
Sum of tokens :26
25. Write a java program on “StringTokenizer” class.
import java.util.*;
import java.lang.*;
import java.io.*;
class StringToken
{
public static void main(String args[])throws IOException
{
String str=new String("welcome to java lab");
StringTokenizer stz=new StringTokenizer(str);
System.out.println("No.of words are:");
System.out.println(stz.countTokens());
System.out.println("Tokens are:");
while(stz.hasMoreTokens())
{
System.out.println(stz.nextToken());
}
int count=0;
for(int i=0;i<str.length();i++)
if(str.charAt(i)!=' ')
count++;
System.out.println("Total no of characters:"+count);
}
}
Output:
No.of words are:
4
Tokens are:
welcome
to
java
lab
Total no of characters:16
26. Write a java program on “Inheritence” concept.
interface Father
{
int PROP1=500000;
}
interface Mother
{
int PROP2=800000;
}
class Child implements Father,Mother
{
void property()
{
System.out.println("child property="+(PROP1+PROP2));
}
}
class MultiInher
{
public static void main(String args[])
{
Child ch=new Child();
ch.property();
}
Output:
child property=1300000
27. Write an example using “StringTokenizer” class.
import java.io.*;
import java.util.*;
class DiffData
{
public static void main(String args[])throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("enter name,age,salary");
String s=br.readLine();
StringTokenizer str=new StringTokenizer(s,",");
String s1=str.nextToken();
String s2=str.nextToken();
String s3=str.nextToken();
s1=s1.trim();
s2=s2.trim();
s3=s3.trim();
String name=s1;
int age=Integer.parseInt(s2);
float salary=Float.parseFloat(s3);
System.out.println("name="+name);
System.out.println("Age="+age);
System.out.println("Salary="+salary);
}
}
Output:
enter name,age,salary
puja,24,15000
name=puja
Age=24
Salary=15000.0
28. Write a java program to make frequency count of words in a given text.
import java.util.*;
import java.lang.*;
import java.io.*;
class Freq
{
public static void main(String[ ] args) throws IOException
{
DataInputStream dis=new DataInputStream(System.in);
System.out.println("Enter number of words");
String str=dis.readLine();
String temp;
StringTokenizer st=new StringTokenizer(str);
int n=st.countTokens( );
String a[ ]=new String[n];
int i=0,count=0;
while(st.hasMoreTokens())
{
a[i]=st.nextToken();
i++;
}
for(int x=1;x<n;x++)
{
for(int y=0;y<n-x;y++)
{
if(a[y].compareTo(a[y+1])>0)
{
temp=a[y];
a[y]=a[y+1];
a[y+1]=temp;
}
}
}
System.out.println("the sorted string are:");
for(i=0;i<n;i++)
{
System.out.println(a[i]+" ");
}
System.out.println();
for(i=0;i<n;i++)
{
count=1;
if(i<n-1)
{
while(a[i].compareTo(a[i+1])==0)
{
count++;
i++;
if(i>=n-1)
{
System.out.println(a[i]+" "+count);
System.exit(0);
}
}
}
System.out.println(a[i]+" "+count);
}
}
}
Output:
Enter number of words
anu puja rani anu vani rani
the sorted string are:
anu
anu
puja
rani
rani
vani
anu 2
puja 1
rani 2
vani 1
29. Write a java program to display Employee data.
import java.io.*;
class Employee
{
int id;
String name;
Employee(int i,String n)
{
id=i;
name=n;
}
void displayData()
{
System.out.println(id+"\t"+name);
}
}
class Group
{
public static void main(String args[])throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
Employee arr[]=new Employee[5];
for(int i=0;i<5;i++)
{
System.out.println("enter id");
int id=Integer.parseInt(br.readLine());
System.out.println("enter name");
String name=br.readLine();
arr[i]=new Employee(id,name);
}
System.out.println("Employee data");
for(int i=0;i<arr.length;i++)
{
arr[i].displayData();
}
}
}
Output:
1
enter name
rani
enter id
2
enter name
bhavya
enter id
3
enter name
madhu
enter id
4
enter name
peethi
enter id
5
enter name
sonu
Employee data
1 rani
2 bhavya
3 madhu
4 peethi
5 sonu
30. Write a java program using “Super” keyword.
import java.io.*;
class A
{
int a;
A(int a)
{
this.a=a;
}
void showA()
{
System.out.println("The value of a is "+a);
}
}
class B extends A
{
int b;
B(int a,int b)
{
super(a);
this.b=b;
}
void showB()
{
System.out.println("The value of b is "+b);
}
}
class SuperKey
{
public static void main(String args[])
{
B o=new B(100,200);
o.showA();
o.showB();
}
}
Output:
The value of a is 100
The value of b is 200
31. Write a java program using “Abstract class”.
abstract class A
{
abstract void call();
void callMethod()
{
System.out.println("This is concreate method");
}
}
class B extends A
{
void call()
{
System.out.println("This is implementation of class ");
}
}
class AbstractDemo
{
public static void main(String args[])
{
B b=new B();
b.call();
b.callMethod();
}
}
Output:
This is implementation of class
This is concreate method
32. Write a java program on creating and implementation of package.
//creating own package.
package pack;
public class Add
{
public int i,j;
public Add(int i,int j)
{
this.i=i;
this.j=j;
}
public void add()
{
System.out.println("Details");
System.out.println(".................");
System.out.println("Additon is: "+(i+j));
}
}
//implementation of a package.
import pack.Add;
class PackExe
{
public static void main(String args[])
{
Add a=new Add(20,45);
a.add();
}
}
Output:
>javac -d . Add.java
>javac PackExe.java
>java PackExe
Details
.................
Additon is: 65
33. Write a java program on “Interface” concept.
interface MyInterface
{
public void sayHello();
}
class Subclass implements MyInterface
{
public void sayHello()
{
System.out.println("hello");
}
}
class DemoInterface
{
public static void main(String args[ ])
{
Subclass i=new Subclass();
i.sayHello();
}
}
Output:
hello
34. Write a Java program that reads on file name from the user then displays information about whether the file exists,whether the file is readable,whether the file is writable,the type of the file and the length of the file in bytes.
import java.util.Scanner;
import java.io.File;
class FileDemo
{
public static void main(String[] args)
{
Scanner input=new Scanner(System.in);
String s=input.nextLine();
File f1=new File(s);
System.out.println("File Name:"+f1.getName());
System.out.println("Path:"+f1.getPath());
System.out.println("Abs Path:"+f1.getAbsolutePath());
System.out.println("Parent:"+f1.getParent());
System.out.println("This file is:"+(f1.exists()?"Exists":"Does not exists"));
System.out.println("Is file:"+f1.isFile());
System.out.println("Is Directory:"+f1.isDirectory());
System.out.println("Is Readable:"+f1.canRead());
System.out.println("IS Writable:"+f1.canWrite());
System.out.println("Is Absolute:"+f1.isAbsolute());
System.out.println("File Last Modified:"+f1.lastModified());
System.out.println("File Size:"+f1.length()+"bytes");
System.out.println("Is Hidden:"+f1.isHidden());
}}
Output:
Fibonacci.java
File Name:Fibonacci.java
Path: Fibonacci.java
Abs Path: c:\sameer\Fibonacci.java
Parent: Null
This file is:Exists
Is file:true
Is Directory:false
Is Readable:true
Is Writable:true
Is Absolute:false
File Last Modified:1206324301937
File Size: 406 bytes
Is Hidden:false
35. Wtire a Java program that reads a file and displays a file and displays the file on the screen,with a line number before each line.
import java.io.*;
class Linenum
{
public static void main(String[] args)throws IOException
{
FileInputStream fil;
LineNumberInputStream line;
int i;
try
{
fil=new FileInputStream(args[0]);
line=new LineNumberInputStream(fil);
}
catch(FileNotFoundException e)
{
System.out.println("No such file found");
return;
}
do
{
i=line.read();
if(i=='\n')
{
System.out.println();
System.out.print(line.getLineNumber()+" ");
}
else
System.out.print((char)i);
}while(i!=-1);
fil.close();
line.close();
}
}
Output:
Demo.java
class Demo
1 {
2 public static void main(java Demo beta gamma delta)
3 {
4 int n = 1 ;
5 System.out.println("The word is " + args[ n ] );
6 }
7 }
8?
36. Write a Java program that displays the number of characters,lines and words in a given text file.
import java.io.*;
class Wordcount
{
public static int words=0;
public static int lines=0;
public static int chars=0;
public static void wc(InputStreamReader isr)throws IOException
{
int c=0;
boolean lastwhite=true;
while((c=isr.read())!=-1)
{
++chars;
if(c=='\n')
lines++;
if(c=='\t' || c==' ' || c=='\n')
++words;
if(chars!=0)
++chars;
}
}
public static void main(String[] args)
{
FileReader fr;
try
{
if(args.length==0)
{
wc(new InputStreamReader(System.in));
}
else
{
for(int i=0;i<args.length;i++)
{
fr=new FileReader(args[i]);
wc(fr);
}
}
}
catch(IOException ie)
{
return;
}
System.out.println("No. of Lines"+lines+"\nNo. of Words"+words+"\nNo. of chars"+chars);
}
}
Output:
This is cse
^Z
No. of Lines1
No. of Words3
No. of chars13
37. Write a java program on “try,catch,finally” blocks.
class DemoEx
{
public static void main(String args[])
{
try
{
int a,b,c;
a=Integer.parseInt(args[0]);
b=Integer.parseInt(args[1]);
c=a/b;
System.out.println("Result is ="+c);
}
catch (ArithmeticException ae)
{
System.out.println("not enter zeros");
}
catch (ArrayIndexOutOfBoundsException e)
{
System.out.println("enter at least 2 no's");
}
catch (NumberFormatException ne)
{
System.out.println("enter int values");
}
finally
{
System.out.println("This is final");
}
}
}
Output:
>java DemoEx 4 0
not enter zeros
This is final
>java DemoEx 4
enter at least 2 no's
This is final
>java DemoEx 4.2 3.4
enter int values
This is final
>java DemoEx 4 2
Result is =2
This is final
38. Write a java program on creating own exception.
class VException extends Exception
{
VException(String s)
{
super(s);
}
}
class Voting
{
static void displayvote(int age)throws VException
{
if(age<19)
throw new VException("Invalid age");
System.out.println("Candidate is eligible to vote");
}
}
class UserExe
{
public static void main(String args[])
{
int age = Integer.parseInt(args[0]);
try
{
Voting.displayvote(age);
}
catch(VException e)
{
System.out.println(e.getMessage());
}
}
}
Output:
>java UserExe 23
Candidate is eligible to vote
>java UserExe 16
Invalid age
39. Write a java program using “HashSet” method..
import java.util.*;
class HS
{
public static void main(String args[])
{
HashSet<String> hs=new HashSet<String>();
hs.add("india");
hs.add("us");
hs.add("uk");
hs.add("japan");
System.out.println("HashSet ="+hs);
Iterator it=hs.iterator();
System.out.println("elements using iterator");
while(it.hasNext())
{
String s=(String)it.next();
System.out.println(s);
}
}
}
Output:
HashSet =[
uk, japan, us, india]
elements using iterator
uk
japan
us
india
40 . Write a Java program that implements stack ADT.
import java.lang.*;
import java.io.*;
import java.util.*;
interface Mystack
{
int n=10;
public void pop();
public void push();
public void display();
}
class Stackimp implements Mystack
{
int stack[]=new int[n];
int top=-1;
public void push()
{
try
{
DataInputStream dis=new DataInputStream(System.in);
if(top==(n-1))
{
System.out.println("overflow");
return;
}
else
{
System.out.println("enter element");
int ele=Integer.parseInt(dis.readLine());
stack[++top]=ele;
}
}
catch(Exception e)
{
System.out.println("e");
}
}
public void pop()
{
if(top<0)
{
System.out.println("underflow");
return;
}
else
{
int popper=stack[top];
top--;
System.out.println("popped element" +popper);
}
}
public void display()
{
if(top<0)
{
System.out.println("empty");
return;
}
else
{
String str=" ";
for(int i=0;i<=top;i++)
str=str+" "+stack[i];
System.out.println("elements are"+str);
}
}
}
class StackAdt
{
public static void main(String arg[])throws IOException
{
DataInputStream dis=new DataInputStream(System.in);
Stackimp stk=new Stackimp();
int ch=0;
do{
System.out.println("\nMenu is as follows:\n1.push\t2.pop\t3.display\t4.exit");
System.out.println("\nEnter ur choice");
ch=Integer.parseInt(dis.readLine());
switch(ch)
{
case 1:stk.push();
break;
case 2:stk.pop();
break;
case 3:stk.display();
break;
case 4:System.exit(0);
}
}while(ch<=5);
}
}
Output:
Menu is as follows:
1.Push
2.Pop
3.Display
4.Exit
Enter ur choice:1
Enter element to push :12
Menu is as follows:
1.Push
2.Pop
3.Display
4.Exit
Enter ur choice:1
Enter element to push:13
Menu is as follows:
1.Push
2.Pop
3.Display
4.Exit
Enter ur choice:3
12
13
Menu is as follows:
1.Push
2.Pop
3.Display
4.Exit
Enter ur choice:2
Popped item:13
Menu is as follows:
1.Push
2.Pop
3.Display
4.Exit
Enter ur choice:2
Popped item:12
Menu is as follows:
1.Push
2.Pop
3.Display
4.Exit
Enter ur choice:3
Stack is empty
41. Write a Java program that converts infix expression into postfix form.
import java.io.*;
class stack
{
char stack1[]=new char[20];
int top;
void push(char ch)
{
top++;
stack1[top]=ch;
}
char pop()
{
char ch;
ch=stack1[top];
top--;
return ch;
}
int pre(char ch)
{
switch(ch)
{
case '-':return 1;
case '+':return 1;
case '*':return 2;
case '/':return 2;
}
return 0;
}
boolean operator(char ch)
{
if(ch=='/'||ch=='*'||ch=='+'||ch=='-')
return true;
else
return false;
}
boolean isAlpha(char ch)
{
if(ch>='a'&&ch<='z'||ch>='0'&&ch=='9')
return true;
else
return false;
}
void postfix(String str)
{
char output[]=new char[str.length()];
char ch;
int p=0,i;
for(i=0;i<str.length();i++)
{
ch=str.charAt(i);
if(ch=='(')
{
push(ch);
}
else if(isAlpha(ch))
{
output[p++]=ch;
}
else if(operator(ch))
{
if(stack1[top]==0||(pre(ch)>pre(stack1[top]))||stack1[top]=='(')
{
push(ch);
}
}
else if(pre(ch)<=pre(stack1[top]))
{
output[p++]=pop();
push(ch);
}
else if(ch=='(')
{
while((ch=pop())!='(')
{
output[p++]=ch;
}
}
}
while(top!=0)
{
output[p++]=pop();
}
for(int j=0;j<str.length();j++)
{
System.out.print(output[j]);
}
}
}
class intopost
{
public static void main(String[] args)throws Exception
{
String s;
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
stack b=new stack();
System.out.println("Enter input string");
s=br.readLine();
System.out.println("Input String:"+s);
System.out.print("Output String:");
b.postfix(s);
}
}
Output:
Enter input string
a+b*c
Input String:a+b*c
Output String:abc*+
Enter input string
a+(b*c)/d
Input String:a+(b*c)/d
Output String:abc*d/)(+
42. Write an applet that displays a simple message.
import java.io.*;
import java.awt.*;
import java.applet.Applet;
/*<applet code="AppletTest.class" height=100 width=500></applet>*/
public class AppletTest extends Applet
{
public void paint(Graphics g)
{
g.drawString("This is CSE IInd Year IInd sem",50,60);
setBackground(Color.yellow);
setForeground(Color.red);
}
}
Output:
>javac AppletTest.java
>appletviewer AppletTest.java
43. Develop an applet that receives an integer in one text field, and computes as factorial value and returns it in another text field,when the button named “Compute” is clicked.
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
/*<applet code="AddEvent.class" height=100 width=500></applet>*/
public class AddEvent extends Applet implements ActionListener
{
TextField tf1;
TextField tf2;
Button b;
Label l;
public void init()
{
setBackground(Color.cyan);
setForeground(Color.blue);
l=new Label("Enter the number & press the button");
tf1=new TextField("",5);
tf2=new TextField("",10);
b=new Button("press me");
add(l);
add(tf1);
add(tf2);
add(b);
b.addActionListener(this);
}
public void actionPerformed(ActionEvent ae)
{
String str=ae.getActionCommand();
String str1;
int fact=1;
if(str=="press me")
{
int n=Integer.parseInt(tf1.getText());
for(int i=1;i<=n;i++)
fact=fact*i;
str1=""+fact;
tf2.setText(str1);
}
}
}
Output:
>javac AddEvent.java
>appletviewer AddEvent.java
44. Write a Java program that works as a simple calculator.Use a grid layout to arrange buttons for the digits and for the + - * % operations.Add a text field to display the result.
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
/*<applet code="Calculator.class" width=200 height=200></applet>*/
public class Calculator extends Applet implements ActionListener
{
TextField t1;
String a="",b;
String oper="",s="",p="";
int first=0,second=0,result=0;
Panel p1;
Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9;
Button add,sub,mul,div,mod,res,space;
public void init()
{
setBackground(Color.cyan);
setForeground(Color.blue);
Panel p2,p3;
p1=new Panel();
p2=new Panel();
p3=new Panel();
t1=new TextField(a,20);
p1.setLayout(new BorderLayout());
p2.add(t1);
b0=new Button("0");
b1=new Button("1");
b2=new Button("2");
b3=new Button("3");
b4=new Button("4");
b5=new Button("5");
b6=new Button("6");
b7=new Button("7");
b8=new Button("8");
b9=new Button("9");
add=new Button("+");
sub=new Button("-");
mul=new Button("*");
div=new Button("/");
mod=new Button("%");
res=new Button("=");
space=new Button("c");
p3.setLayout(new GridLayout(4,4));
b0.addActionListener(this);
b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
b4.addActionListener(this);
b5.addActionListener(this);
b6.addActionListener(this);
b7.addActionListener(this);
b8.addActionListener(this);
b9.addActionListener(this);
add.addActionListener(this);
sub.addActionListener(this);
mul.addActionListener(this);
div.addActionListener(this);
mod.addActionListener(this);
res.addActionListener(this);
space.addActionListener(this);
p3.add(b0);
p3.add(b1);
p3.add(b2);
p3.add(b3);
p3.add(b4);
p3.add(b5);
p3.add(b6);
p3.add(b7);
p3.add(b8);
p3.add(b9);
p3.add(add);
p3.add(sub);
p3.add(mul);
p3.add(div);
p3.add(mod);
p3.add(res);
p3.add(space);
p1.add(p2,BorderLayout.NORTH);
p1.add(p3,BorderLayout.CENTER);
add(p1);
}
public void actionPerformed(ActionEvent ae)
{
a=ae.getActionCommand();
if(a=="0"||a=="1"||a=="2"||a=="3"||a=="4"||a=="5"||a=="6"||a=="7"||a=="8"||
a=="9")
{
t1.setText(t1.getText()+a);
}
if(a=="+"||a=="-"||a=="*"||a=="/"||a=="%")
{
first=Integer.parseInt(t1.getText());
oper=a;
t1.setText("");
}
if(a=="=")
{
if(oper=="+")
result=first+Integer.parseInt(t1.getText());
if(oper=="-")
result=first-Integer.parseInt(t1.getText());
if(oper=="*")
result=first*Integer.parseInt(t1.getText());
if(oper=="/")
result=first/Integer.parseInt(t1.getText());
if(oper=="%")
result=first%Integer.parseInt(t1.getText());
t1.setText(result+"");
}
if(a=="c")
t1.setText("");
}
}
Output:
>javac Calculator.java
>appletviewer Calculator.java
45. Write a Java program for handling mouse events.
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*
<applet code="Mouse" width=500 height=500>
</applet>
*/
public class Mouse extends Applet
implements MouseListener,MouseMotionListener
{
int X=0,Y=20;
String msg="MouseEvents";
public void init()
{
addMouseListener(this);
addMouseMotionListener(this);
setBackground(Color.black);
setForeground(Color.red);
}
public void mouseEntered(MouseEvent m)
{
setBackground(Color.magenta);
showStatus("Mouse Entered");
repaint();
}
public void mouseExited(MouseEvent m)
{
setBackground(Color.red);
showStatus("Mouse Exited");
repaint();
}
public void mousePressed(MouseEvent m)
{
X=10;
Y=20;
msg="NEC";
setBackground(Color.green);
repaint();
}
public void mouseReleased(MouseEvent m)
{
X=10;
Y=20;
msg="Engineering";
setBackground(Color.blue);
repaint();}
public void mouseMoved(MouseEvent m)
{
X=m.getX();
Y=m.getY();
msg="College";
setBackground(Color.cyan);
showStatus("Mouse Moved");
repaint();
}
public void mouseDragged(MouseEvent m)
{
msg="CSE";
setBackground(Color.yellow);
showStatus("Mouse Moved"+m.getX()+" "+m.getY());
repaint();
}
public void mouseClicked(MouseEvent m)
{
msg="Students";
setBackground(Color.pink);
showStatus("Mouse Clicked");
repaint();
}
public void paint(Graphics g)
{
g.drawString(msg,X,Y);
}}
Output:
>javac Mouse.java
>appletviewer Mouse.java
46. Write a program for handling KeyBoard events.
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*
<applet code="Key" width=300 height=400>
</applet>
*/
public class Key extends Applet
implements KeyListener
{
int X=20,Y=30;
String msg="KeyEvents--->";
public void init()
{
addKeyListener(this);
requestFocus();
setBackground(Color.green);
setForeground(Color.blue);
}
public void keyPressed(KeyEvent k)
{
showStatus("KeyDown");
int key=k.getKeyCode();
switch(key)
{
case KeyEvent.VK_UP:
showStatus("Move to Up");
break;
case KeyEvent.VK_DOWN:
showStatus("Move to Down");
break;
case KeyEvent.VK_LEFT:
showStatus("Move to Left");
break;
case KeyEvent.VK_RIGHT:
showStatus("Move to Right");
break;
}
repaint();
}
public void keyReleased(KeyEvent k)
{
showStatus("Key Up");
}
public void keyTyped(KeyEvent k)
{
msg+=k.getKeyChar();
repaint();
}
public void paint(Graphics g)
{
g.drawString(msg,X,Y);
}
}
Output:
47. Write a java program that creates three threads.First thread displays”Good Morning”every one second,the second thread displays “Hello” every two seconds and the third threaddisplays “Welcome” every three seconds.
class Frst implements Runnable
{
Thread t;
Frst()
{
t=new Thread(this);
System.out.println("Good Morning");
t.start();
}
public void run()
{
for(int i=0;i<10;i++)
{
System.out.println("Good Morning"+i);
try
{
t.sleep(1000);
}
catch(Exception e)
{
System.out.println(e);
}
}
}
}
class sec implements Runnable
{
Thread t;
sec()
{
t=new Thread(this);
System.out.println("hello");
t.start();
}
public void run()
{
for(int i=0;i<10;i++)
{
System.out.println("hello"+i);
Try
{
t.sleep(2000);
}
catch(Exception e)
{
System.out.println(e);
}
}
}
}
class third implements Runnable
{
Thread t;
third()
{
t=new Thread(this);
System.out.println("welcome");
t.start();
}
public void run()
{
for(int i=0;i<10;i++)
{
System.out.println("welcome"+i);
try{
t.sleep(3000);
}
catch(Exception e)
{
System.out.println(e);
}
}
}
}
public class Multithread
{
public static void main(String arg[])
{
new Frst();
new sec();
new third();
}
}
Output:
Good Morning
hello
welcome
Good Morning0
hello0
welcome0
Good Morning1
hello1
welcome1
Good Morning2
hello2
welcome2
Good Morning3
hello3
welcome3
Good Morning4
hello4
welcome4
Good Morning5
hello5
welcome5
Good Morning6
hello6
welcome6
Good Morning7
hello7
welcome7
Good Morning8
hello8
welcome8
Good Morning9
hello9
welcome9
48. Write a java program on “ThreadGroup”.
class ThreadGroupPro
{
public static void main(String args[])
{
ThreadGroup tg=new ThreadGroup("subgroup1");
Thread t1=new Thread(tg,"Thread1");
Thread t2=new Thread(tg,"Thread2");
Thread t3=new Thread(tg,"Thread3");
tg=new ThreadGroup("subgroup2");
Thread t4=new Thread(tg,"Thread4");
Thread t5=new Thread(tg,"Thread5");
tg=Thread.currentThread().getThreadGroup();
int age=tg.activeGroupCount();
System.out.println("No.of sub groups="+age);
System.out.println("Groups are");
tg.list();
}
}
Output:
No.of sub groups=2
Groups are
java.lang.ThreadGroup[name=main,maxpri=10]
Thread[main,5,main]
java.lang.ThreadGroup[name=subgroup1,maxpri=10]
java.lang.ThreadGroup[name=subgroup2,maxpri=10]
49. Write a Java program that correctly implements producer consumer problem using the concept of inter thread communication.
class Q
{
int n;
boolean valueSet=false;
synchronized int get()
{
if(!valueSet)
try
{
wait();
}
catch(InterruptedException e)
{
System.out.println("Interrupted Exception caught");
}
System.out.println("Got:"+n);
valueSet=false;
notify();
return n;
}
synchronized void put(int n)
{
if(valueSet)
try
{
wait();
}
catch(InterruptedException e)
{
System.out.println("Interrupted Exception caught");
}
this.n=n;
valueSet=true;
System.out.println("Put:"+n);
notify();
}
}
class Producer implements Runnable
{
Q q;
Producer(Q q)
{
this.q=q;
new Thread(this,"Producer").start();
}
public void run()
{
int i=0;
while(true)
{
q.put(i++);
}
}
}
class Consumer implements Runnable
{
Q q;
Consumer(Q q)
{
this.q=q;
new Thread(this,"Consumer").start();
}
public void run()
{
while(true)
{
q.get();
}
}
}
class ProdCons
{
public static void main(String[] args)
{
Q q=new Q();
new Producer(q);
new Consumer(q);
System.out.println("Press Control-c to stop");
}
}
Output:
Put:0
Press Control-c to stop
Got:0
Put:1
Got:1
Put:2
Got:2
Put:3
Got:3
Put:4
Got:4
Put:5
Got:5
Put:6
Got:6
Put:7
Got:7
Put:8
Got:8
Put:9
Got:9
Put:10
Got:10
Put:11
Got:11
Put:12
Got:12
Put:13
Got:13
Put:14
Got:14
Put:15
Got:15
50. Write a program that creates a user interface to perform integer divisions.The user enters two numbers int the textfields,Num1 and Num2.The divison of Num1 and Num2 is displayed in the Result field when the Divide button is clicked.If Num1 or Num2 were not an integer,the program would throw a NumberFormatException.If Num2 were Zero,the programwould throw an ArithmeticException Display the exception in a message dialog box.
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;
import javax.swing.*;
/*<applet code="Divide.class" height=100 width=500></applet>*/
public class Divide extends Applet implements ActionListener
{
TextField tf1;
TextField tf2;
Button b;
TextField tf3;
Label l;
public void init()
{
setBackground(Color.cyan);
setForeground(Color.blue);
l=new Label("enter the numbers and press divide button");
tf1=new TextField("",5);
tf2=new TextField("",5);
tf3=new TextField("",5);
b=new Button("Divide");
add(l);
add(tf1);
add(tf2);
add(b);
add(tf3);
b.addActionListener(this);
}
public void actionPerformed(ActionEvent ae)
{
if(ae.getActionCommand()=="Divide")
{
try{
int n1=Integer.parseInt(tf1.getText());
int n2=Integer.parseInt(tf2.getText());
int n=n1/n2;
tf3.setText(""+n);
}
catch(ArithmeticException e1)
{
JOptionPane.showMessageDialog(null,"Arthimetic Exception");
}
catch(NumberFormatException e2)
{
JOptionPane.showMessageDialog(null,"NumberFormatException");
}
}
}
}
Output:
>javac Divide.java
>appletviewer Divide.java
51. Write a java program that stimulates a traffic light. The program lets the user select
one of three lights: red, yellow, or green. When a radio button is selected, the light is
turned on, and only one light can be on at a time No light is on when the program starts.
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*<applet code="CBGroup" width=250 height=200></applet>*/
public class CBGroup extends Applet implements ItemListener
{
String msg="";
Checkbox Red,Green,Yellow;
CheckboxGroup cbg;
public void init()
{
setBackground(Color.cyan);
cbg=new CheckboxGroup();
Red=new Checkbox("RED",cbg,false);
Green=new Checkbox("GREEN",cbg,false);
Yellow=new Checkbox("YELLOW",cbg,false);
add(Red);
add(Yellow);
add(Green);
Red.addItemListener(this);
Green.addItemListener(this);
Yellow.addItemListener(this);
}
public void itemStateChanged(ItemEvent ie)
{
repaint();
}
public void paint(Graphics g)
{
//g.drawOval(10,10,50,50);
if(cbg.getSelectedCheckbox().getLabel()=="RED")
{
g.setColor(Color.red);
g.fillOval(10,10,50,50);
}
if(cbg.getSelectedCheckbox().getLabel()=="YELLOW")
{
g.setColor(Color.yellow);
g.fillOval(10,10,50,50);
}
if(cbg.getSelectedCheckbox().getLabel()=="GREEN")
{
g.setColor(Color.green);
g.fillOval(10,10,50,50);
}
}
}
Output:
>javac CBGroup.java
>appletviewer CBGroup.java
52. Write a Java program that allows the user to draw lines, rectangles and ovals
import java.awt.*;
import java.applet.*;
/*<applet code="Draw.class" width=200 height=200>
</applet>*/
public class Draw extends Applet
{
public void paint(Graphics g)
{
for(int i=0;i<=250;i++)
{
Color c1=new Color(35-i,55-i,110-i);
g.setColor(c1);
g.drawRect(250+i,250+i,100+i,100+i);
g.drawOval(100+i,100+i,50+i,50+i);
g.drawLine(50+i,20+i,10+i,10+i);
}
}
}
Output: >appletviewer Draw.java
53. Write a java program to create an abstract class named Shape that contains an empty
method name numberOfSides().Provide three classes named Trapezoid,Traingle and Hexagon
such that each of the classes extends the class Shape. Each one of the classes contains only
the method numberOfSides() that shows the number of sides in the given geometrical
figures.
import java.lang.*;
abstract class Shape
{
abstract void numberOfSides();
}
class Traingle extends Shape
{
public void numberOfSides()
{
System.out.println("three");
}}
class Trapezoid extends Shape
{
public void numberOfSides()
{
System.out.println("four");
}}
class Hexagon extends Shape
{
public void numberOfSides()
{
System.out.println("six");
}}
public class Sides
{
public static void main(String arg[])
{
Traingle T=new Traingle();
Trapezoid Ta=new Trapezoid();
Hexagon H=new Hexagon();
T.numberOfSides();
Ta.numberOfSides();
H.numberOfSides();
}}
Output:
three
four
six
54. Write a java program for FlowLayout.
import java.awt.*;
class DemoFlowLayout extends Frame
{
public DemoFlowLayout()
{
setLayout(new FlowLayout());
for(int i=1;i<=20;i++)
{
Button b=new Button(String.valueOf(i));
add(b);
}
setBackground(Color.cyan);
setForeground(Color.blue);
setSize(100,200);
setVisible(true);
}
public static void main(String args[])
{
DemoFlowLayout df=new DemoFlowLayout();
}
}
Output:
55. Write a java program for GridLayout.
import java.awt.*;
import java.applet.*;
class DemoGridLayout extends Frame
{
public DemoGridLayout()
{
setLayout(new GridLayout(5,4));
for(int i=1;i<=20;i++)
{
Button b=new Button(String.valueOf(i));
add(b);
}
setBackground(Color.cyan);
setForeground(Color.blue);
setSize(100,200);
setVisible(true);
}
public static void main(String args[])
{
DemoGridLayout dg=new DemoGridLayout();
}
}
Output:
56. Write a java program for BorderLayout.
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
class DemoBoarder extends Frame
{
Button b1,b2,b3,b4,b5;
public DemoBoarder()
{
setForeground(Color.blue);
setLayout(new BorderLayout());
b1=new Button("one");
b2=new Button("two");
b3=new Button("three");
b4=new Button("four");
b5=new Button("five");
add(b1,"East");
add(b2,"West");
add(b3,"North");
add(b4,"South");
add(b5,"Center");
setSize(300,300);
setVisible(true);
}
public static void main(String args[])
{
DemoBoarder db=new DemoBoarder();
}
}
Output:
57. Write a java program for CardLayout.
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
/*<APPLET
CODE=CardLayoutDemo.class
WIDTH=400
HEIGHT=200>
</APPLET>
*/
public class CardLayoutDemo extends Applet implements ActionListener
{
CardLayout cl;
Panel p;
public void init()
{
setBackground(Color.cyan);
setForeground(Color.blue);
p=new Panel();
add(p);
cl=new CardLayout();
p.setLayout(cl);
initialisation();
}
void initialisation()
{
Button b1=new Button("Button1");
Button b2=new Button("Button2");
Button b3=new Button("Button3");
b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
p.add(b1,"Button1");
p.add(b2,"Button2");
p.add(b3,"Button3");
}
public void actionPerformed(ActionEvent e)
{
cl.next(p);
}
}
Output:
>javac CardLayoutDemo.java
>appletviewer CardLayoutDemo.java
58. Write a java program on “Server and Client”.
/*Server.java*/
import java.io.*;
import java.net.*;
class Server
{
public static void main(String args[]) throws Exception
{
ServerSocket ss=new ServerSocket(777);
Socket s=ss.accept();
System.out.println("connection establisted");
OutputStream obj=s.getOutputStream();
PrintStream ps=new PrintStream(obj);
String str="Hello client";
ps.println(str);
ps.println("Good Bye");
ps.close();
ss.close();
s.close();
}
}
/*Client.java*/
import java.io.*;
import java.net.*;
class Client
{
public static void main(String args[]) throws Exception
{
Socket s=new Socket("localhost",777);
InputStream obj=s.getInputStream();
BufferedReader br=new BufferedReader(new InputStreamReader(obj));
String str;
while((str=br.readLine())!=null)
System.out.println("from Server1:"+str);
br.close();
s.close();
}
}
Output:
From Server:
>javac Server1.java
>java Server1
connection establisted
From Client:
>javac Client1.java
>java Client1
from Server1:Hello client
from Server1:Good Bye
59. Write a java program on “Canvas”.
import java .awt.*;
import java.applet.*;
/*<APPLET CODE=CanvasDemo.class WIDTH=300 HEIGHT=300>
</APPLET>*/
public class CanvasDemo extends Applet
{
public void init()
{
setBackground(Color.red);
CanvasExe ce=new CanvasExe();
ce.setSize(200,200);
ce.setBackground(Color.blue);
ce.setVisible(true);
add(ce);
}
class CanvasExe extends Canvas
{
public void paint(Graphics g)
{
setForeground(Color.green);
g.fillOval(30,0,80,80);
g.drawString("Hello",50,100);
}}}
Output:
