public class SwapDemo {
    private int value;

    public SwapDemo(int val) {
        value = val;
    }

    public void setValue(int val)    {
        value = val;
    }

    public int getValue()    {
        return value;
    }
        

    public static void main(String[] args) {
        SwapDemo x = new SwapDemo(3);
        SwapDemo y = new SwapDemo(5);
        System.out.println("Before swap1, x is " + 
`                           x.getValue() + "; y is " + y.getValue());
        swap1(x, y);
        System.out.println("After swap1, x is " +
                           x.getValue() + "; y is " + y.getValue());
        System.out.println("Before swap2, x is " + 
                           x.getValue() + "; y is " + y.getValue());
        swap2(x, y);
        System.out.println("After swap2, " +
                           "x is " + x.getValue() + "; y is " + y.getValue());
        int a = 3;
        int b = 5;
        System.out.println("Before int swap, a is " + a + "; b is " + b);
        swap(a, b);
        System.out.println("After int swap, a is " + a + "; b is " + b);
    }
        
    public static void swap1(SwapDemo x, SwapDemo y)
    {
        System.out.println("Begin swap1, x is " +
                           x.getValue() + "; y is " + y.getValue());
        SwapDemo temp;
        temp = x;
        x = y;
        y = temp;
        System.out.println("End swap1, x is " +
                           x.getValue() + "; y is " + y.getValue());
    }
        
    public static void swap2(SwapDemo x, SwapDemo y) {
        System.out.println("Begin swap2, x is " +
                           x.getValue() + "; y is " + y.getValue());
        int temp = x.getValue();
        x.setValue(y.getValue());
        y.setValue(temp);
        System.out.println("End swap2, x is " +
                           x.getValue() + "; y is " + y.getValue());
    }
        
    // this is identical to the C++ version; only println's added
    public static void swap(int x, int y) {
        System.out.println("Begin int swap, x is " + x + "; y is " + y);
        int temp = x;
        x = y;
        y = temp;
        System.out.println("End int swap, x is " + x + "; y is " + y);
    }
}