7) Write a Java program that converts any decimal integer number into binary and octal and hexadecimal equivalents using Integer class methods.

 source file name:  convdemo.java

import java.io.*;

class convdemo

{

public static void main(String as[])

{

int n=1;

System.out.println("enter value:");

try{

DataInputStream dis=new DataInputStream(System.in);

String s=dis.readLine();//accept input number from user

n=Integer.parseInt(s);

System.out.println("Binary conversion "+Integer.toBinaryString(n));

System.out.println("Octal conversion "+Integer.toOctalString(n));

String hexastr=Integer.toHexString(n);

System.out.println("Hexadecimal conversion "+hexastr.toUpperCase());

}

catch(Exception e)

{

System.out.println(e);

}

}

}

output 1:

D:\JavaPrograms\Misc>javac convdemo.java

D:\JavaPrograms\Misc>java convdemo

enter value:

100

Binary conversion 1100100

Octal conversion 144

Hexadecimal conversion 64

output 2: 

D:\JavaPrograms\Misc>java convdemo

enter value:

1000

Binary conversion 1111101000

Octal conversion 1750

Hexadecimal conversion 3E8