Java Program - Passing values to methords

public class Passing {

public static void main(String[] args) {
// TODO Auto-generated method stub
Demo obj1 = new Demo(10);
Demo obj2 = new Demo(20);
Demo obj3 = new Demo(30);
System.out.println("The values before calling swap " +obj1.i + "\t" +obj2.i);
obj3.swap(obj1.i, obj2.i);
System.out.println("The values after calling swap " +obj1.i + "\t"  +obj2.i);
}

}

public class Demo {

int i;

Demo(int i){

this.i=i;

}

void swap(int i,int j){

int temp;

temp=i;

i=j;

j=temp;

}

}

Output:-

The values before calling swap 10 20

The values after calling swap 10 20