Dekker

public class TestThread extends Thread {
    private A a;
    private int number;
    private static boolean flag1 = false;
    private static boolean flag2 = false;
    private static int turn = 0;

    public TestThread(A a, int number) {
        this.a = a;
        this.number = number;
    }

    @Override
    public void run() {
        for (int i = 0; i < 100; i++) {
            if (this.number % 2 == 0) {
                flag1 = true;
                while (flag2) {
                    if (turn == 1) {
                        flag1 = false;
                        while (turn == 1) {

                        }
                        flag1 = true;
                    }
                }
                a.setValue(a.getValue() + 1);
                System.out.println("Thread - " + this.number + ", value = " + a.getValue());
                turn = 2;
                flag1 = false;
            } else {
                flag2 = true;
                while (flag1) {
                    if (turn == 2) {
                        flag2 = false;
                        while (turn == 2) {

                        }
                        flag2 = true;
                    }
                }
                a.setValue(a.getValue() + 1);
                System.out.println("Number: " + this.number + "Value = " + a.getValue());
                turn = 1;
                flag2 = false;
            }
        }
    }
}