public class TukarPrimitif {

    static void tukar(int a, int b) {
        int sementara = a;
        a = b;
        b = sementara;
        System.out.println("di dalam tukar: a = " + a + ", b = " + b);
    }

    public static void main(String[] args) {
        int x = 1;
        int y = 9;

        System.out.println("sebelum        : x = " + x + ", y = " + y);
        tukar(x, y);
        System.out.println("sesudah        : x = " + x + ", y = " + y);
    }
}