Program for swapping two numbers

class swapper {

  public static void main(String args[]) {

    int a=10,b=20,temp;

    System.out.println("Before swapping: "+a+" and "+b);

    temp=a;

    a=b;

    b=temp;

    System.out.println("After swapping: "+a+" and "+b);

  }

}

OUTPUT:

C:\jdk1.7.0\bin>java swapper

Before swapping: 10 and 20

After swapping: 20 and 10