Reordering Effects

class ReorderingExample {
    // shared variables
    int sharedA = 0;
    int sharedB = 0;
    // executed by thread1
    void method1() {
        int localA;
        localA = sharedA;
        sharedB = 1;
        System.out.println("localA = " + localA);
    }
    // executed by thread2
    void method2() {
        int localB;
        localB= sharedB;
        sharedA = 2;
        System.out.println("localB = " + localB);
    }
    public static void main(String[] args) throws InterruptedException {
        final ReorderingExample reorderingExample = new ReorderingExample();
        Thread thread1 = new Thread(new Runnable() {
            @Override
            public void run() {
                reorderingExample.method1();
            }
        });
        Thread thread2 = new Thread(new Runnable() {
            @Override
            public void run() {
                reorderingExample.method2();
            }
        });
        thread1.start();
        thread2.start();
        thread1.join();
        thread2.join();
    }
}