Program to read data from Keyboard using BufferedReader class of java.io package

// Program to read data from Keyboard using 
// BufferedReader class of java.io package.
import java.io.*;
class  Swap1
{
public static void main( String args[ ] )
{
 int  a=0, b=0, t;
 InputStreamReader isr = new InputStreamReader( System.in );
 BufferedReader br = new BufferedReader( isr );
 
 try
 {  
  System.out.print(" Enter first Number : ");
  a = Integer.parseInt(br.readLine());
  System.out.print(" Enter second Number : ");
  b = Integer.parseInt(br.readLine());
 }
 catch( Exception e )
 {
  System.out.println("Exception occured.");
 }

 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 : 10
Enter second Number : 20
Before Swapping : 10  20
After Swapping  : 20  10