public class FieldTest {

    private int value = 0;

    public void setValue(int value) {
        this.value = value;
    }

    public int getValue() {
        return this.value;
    }

    public static long testFieldAccess(int num) {
        FieldTest f = new FieldTest();

        long start = System.nanoTime();

        for (int i = 0; i < num; i++) {
            f.value = f.value + 1;
        }
        f.value = 0;

        return System.nanoTime() - start;
    }

    public static long testMethodAccess(int num) {
        FieldTest f = new FieldTest();

        long start = System.nanoTime();

        for (int i = 0; i < num; i++) {
            f.setValue(f.getValue() + 1);
        }
        f.setValue(0);

        return System.nanoTime() - start;
    }

    public static void main(String[] args) {
        int num = 2147483647;

        // "warn up" the VM
        FieldTest f = new FieldTest();
        f.value = 0;
        f.setValue(0);
        f.value = f.value;
        f.setValue(f.getValue());

        // perform test
        for (int i = 0; i < 10; i++) {
            System.out.printf("Field Access:  %d ns\n", testFieldAccess(num));
            System.out.printf("Method Access: %d ns\n", testMethodAccess(num));
            System.out.println();
        }
    }

}