Program to read data from Keyboard using DataInputStream class in Java

// Program to read data from Keyboard using DataInputStream class.
import java.io.*;
class  Swap3
{
public static void main( String args[ ] ) throws IOException
{
 int  a=0, b=0, t;
 DataInputStream dis = new DataInputStream(System.in );
 
 System.out.print(" Enter first Number : ");
 a = Integer.parseInt(dis.readLine());
 System.out.print(" Enter second Number : ");
 b = Integer.parseInt(dis.readLine());

 System.out.print( "\n Before Swapping : " );
 System.out.print( a + "   " + b );
 a = a + b;
 b = a - b;
 a = a - b;
 
 System.out.print( "\n After Swapping  : " );
 System.out.print( a + "   " + b );
}
}

Output:
Enter first Number : 100
Enter second Number : 200
Before Swapping : 100  200
After Swapping  : 200  100