Java 多线程Synchronized和Lock的区别

lock()：获取锁，如果锁被暂用则一直等待
unlock():释放锁
tryLock(): 注意返回类型是boolean，如果获取锁的时候锁被占用就返回false，否则返回true
tryLock(long time, TimeUnit unit)：比起tryLock()就是给了一个时间期限，保证等待参数时间
lockInterruptibly()：用该锁的获得方式，如果线程在获取锁的阶段进入了等待，那么可以中断此线程，先去做别的事 　　通过 以上的解释，大致可以解释在上个部分中“锁类型(lockInterruptibly())”，“锁状态(tryLock())”等问题，还有就是前面子所获取的过程我所写的“大致就是可以尝试获得锁，线程可以不会一直等待”用了“可以”的原因。

public class LockTest {
  private Lock lock = new ReentrantLock();

  private void method(Thread thread) {
    lock.lock();
    try {
      System.out.println(thread.getName() + " has gotten the lock!");
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      System.out.println(thread.getName() + " has unlocked the lock!");
      lock.unlock();
    }
  }

  public static void main(String[] args) {
    final LockTest test = new LockTest();

    Thread t1 = new Thread(new Runnable() {
      @Override
      public void run() {
        test.method(Thread.currentThread());
      }
    }, "t1");
    Thread t2 = new Thread(new Runnable() {
      @Override
      public void run() {
        test.method(Thread.currentThread());
      }
    }, "t2");
    t1.start();
    t2.start();
  }

}

t1 has gotten the lock!
t1 has unlocked the lock!
t2 has gotten the lock!
t2 has unlocked the lock!

public class LockTest {
  private Lock lock = new ReentrantLock();

  private void method(Thread thread) {

    if (lock.tryLock()) {
      lock.lock();
      try {
        System.out.println(thread.getName() + " has gotten the lock!");
      } catch (Exception e) {
        e.printStackTrace();
      } finally {
        System.out.println(thread.getName() + " has unlocked the lock!");
        lock.unlock();
      }
    } else {
      System.out.println("I'm "+thread.getName()+". Someone has gotten the lock!");
    }
  }

  public static void main(String[] args) {
    LockTest test = new LockTest();

    Thread t1 = new Thread(() -> test.method(Thread.currentThread()), "t1");
    Thread t2 = new Thread(new Runnable() {
      @Override
      public void run() {
        test.method(Thread.currentThread());
      }
    }, "t2");
    t1.start();
    t2.start();
  }
}

t1 has gotten the lock!
t1 has unlocked the lock!
I'm t2. Someone has gotten the lock!