public class Test {
  private int value;
  
  public static void main(String[] args) {
    Test test = new Test(); 
    for (int i = 0; i < 2; i++) {
      int id = i;
      new Thread(() -> {
        for (;;) {
          test.value = id;
          if (test.value != id) {
            System.out.println("id " + id + ' ' + test.value);
          }
        }
      }).start();
    }
  }
}