多線程實現計數器功能

使用lock實現：

public class LockTest {
    private int count;
    private Lock lock = new ReentrantLock();
    public static void main(String[] args) {
        LockTest lockTest = new LockTest();
        Thread t1 = new Thread(()->{
            for (int i = 0; i < 10000; i++) {
                lockTest.add();
            }
        });
        t1.setName("t1");
        Thread t2 = new Thread(()->{
            for (int i = 0; i < 10000; i++) {
                lockTest.add();
            }
        });
        t2.setName("t2");
        t1.start();
        t2.start();
        try {
            t1.join();
            t2.join();
            System.out.println(lockTest.count);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
    public void add(){
        lock.lock();
        try {
                count++;
                System.out.println(Thread.currentThread().getName()+"線程"+count);

        }finally {
            lock.unlock();
        }
    }
}

使用tryLock()實現

public void add1(){
        try {
            if (lock.tryLock(1000L,TimeUnit.MILLISECONDS)){
                try {
                    count++;
                    System.out.println(Thread.currentThread().getName()+"線程"+count);
                }finally {
                    lock.unlock();
                }
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }