设计四个线程，其中两个线程每次对j加1，另外两个线程每次对j减1

public class ManyThreads2 {

    private int j = 0;

    public synchronized void inc() {

        j++;

        System.out.println(Thread.currentThread().getName() + "inc" + j);

    }

    public synchronized void dec() {

        j--;

        System.out.println(Thread.currentThread().getName() + "dec" + j);

    }

}

public class MyTest {

    private ManyThreads2 many = new ManyThreads2();

    public static void main(String[] args) {

        // TODO Auto-generated method stub

        MyTest myTest = new MyTest();

        myTest.test();

    }

    public void test() {

        for (int i = 0; i < 2; i++) {

            new Thread(new Runnable() {

                @Override

                public void run() {

                    // TODO Auto-generated method stub

                    for (int i = 0; i < 20; i++) {

                        many.inc();

                    }

                }

            }).start();

            new Thread(new Runnable() {

                @Override

                public void run() {

                    // TODO Auto-generated method stub

                    for (int i = 0; i < 20; i++) {

                        many.dec();

                    }

                }

            }).start();

        }

    }

}

巴特西

设计四个线程，其中两个线程每次对j加1，另外两个线程每次对j减1

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