Call by Value

import java.util.*;
class Main
{
    int a,b;
    public static void main(String args[])
    {
        Scanner sc = new Scanner(System.in);
        Main m=new Main();
        System.out.println("Enter two number:");
        m.a=sc.nextInt();
        m.b=sc.nextInt();
        System.out.println("Numbers are a="+m.a+"\tb="+m.b);
        swap(m.a,m.b);
        System.out.println("After returning from method \n numbers are a="+m.a+"\tb="+m.b);
    }
    static int swap (int a,int b)
    {
        int temp;
        temp=a;
        a=b;
        b=temp;
        System.out.println("After swapping in method\n numbers are a="+a+"\tb="+b);
    }
}