Lock类相关知识点

public class MyConditionService {

    private Lock lock = new ReentrantLock();
    public void testMethod(){
        lock.lock();
        for (int i = 0 ;i < 5;i++){
            System.out.println("ThreadName = " + Thread.currentThread().getName() + (" " + (i + 1)));
        }
        lock.unlock();
    }
}

MyConditionService service = new MyConditionService();
    new Thread(service::testMethod).start();
    new Thread(service::testMethod).start();
    new Thread(service::testMethod).start();
    new Thread(service::testMethod).start();
    new Thread(service::testMethod).start();

    Thread.sleep(1000 * 5);

public class MyConditionMoreService {

    private Lock lock = new ReentrantLock();
    public void methodA(){
        try{
            lock.lock();
            System.out.println("methodA begin ThreadName=" + Thread.currentThread().getName() +
                    " time=" + System.currentTimeMillis());
            Thread.sleep(1000 * 5);

            System.out.println("methodA end ThreadName=" + Thread.currentThread().getName() +
                    " time=" + System.currentTimeMillis());
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }

    public void methodB(){
        try{
            lock.lock();
            System.out.println("methodB begin ThreadName=" + Thread.currentThread().getName() +
                    " time=" + System.currentTimeMillis());
            Thread.sleep(1000 * 5);

            System.out.println("methodB end ThreadName=" + Thread.currentThread().getName() +
                    " time=" + System.currentTimeMillis());
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }
}

public void testMethod() throws Exception {
        MyConditionMoreService service = new MyConditionMoreService();
        ThreadA a = new ThreadA(service);
        a.setName("A");
        a.start();

        ThreadA aa = new ThreadA(service);
        aa.setName("AA");
        aa.start();

        ThreadB b = new ThreadB(service);
        b.setName("B");
        b.start();

        ThreadB bb = new ThreadB(service);
        bb.setName("BB");
        bb.start();

        Thread.sleep(1000 * 30);
    }
    
public class ThreadA extends Thread{

    private MyConditionMoreService service;

    public ThreadA(MyConditionMoreService service){
        this.service = service;
    }

    @Override
    public void run() {
        service.methodA();
    }
}

public class ThreadB extends Thread{

    private MyConditionMoreService service;

    public ThreadB(MyConditionMoreService service){
        this.service = service;
    }

    @Override
    public void run() {
        super.run();
        service.methodB();
    }
}

methodA begin ThreadName=A time=1485590913520
methodA end ThreadName=A time=1485590918522
methodA begin ThreadName=AA time=1485590918522
methodA end ThreadName=AA time=1485590923525
methodB begin ThreadName=B time=1485590923525
methodB end ThreadName=B time=1485590928528
methodB begin ThreadName=BB time=1485590928529
methodB end ThreadName=BB time=1485590933533