Java: Why does this swap method not work? [duplicate]

Answer 1

Java code:

class swap {

    int n1;
    int n2;
    int n3;

    void valueSwap() {
        n3 = n1;
        n1 = n2;
        n2 = n3;
    }

    public static void main(String[] arguments) {

        Swap trial = new Swap();
        trial.n1 = 2;
        trial.n2 = 3;

        System.out.println("trial.n1 = " + trial.n1);
        System.out.println("trial.n2 = " + trial.n2);

        trial.valueSwap();

        System.out.println("trial.n1 = " + trial.n1);
        System.out.println("trial.n2 = " + trial.n2);

    }
}

Output:

trial.n1 = 2
trial.n2 = 3
trial.n1 = 3
trial.n2 = 2