在jdk1.5后新增的ReentrantLock類同樣可達到此效果，且在使用上比synchronized更加靈活
相關API：
使用ReentrantLock實現同步
lock()方法:上鎖
unlock()方法：釋放鎖
使用Condition實現等待/通知 類似于 wait()和notify()及notifyAll()
Lock鎖底層基于AQS實現，需要自己封裝實現自旋鎖。

Synchronized —屬于JDK 關鍵字 底層屬于 C++虛擬機底層實現
Lock鎖底層基于AQS實現-- 變為重量級
Synchronized 底層原理—鎖的升級過程
Lock 過程中 注意 獲取鎖 釋放鎖

ReentrantLock用法
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**

• @author zhuimeng
  */
  public class Thread09 implements Runnable {
  private int count = 100;
  private Lock lock = new ReentrantLock();

  @Override
  public void run() {
  while (true) {
  try {
  Thread.sleep(30);
  } catch (Exception e) {

  }try {// 獲取鎖lock.lock();if (count > 1) {count--;System.out.println(Thread.currentThread().getName() + "," + count);}} catch (Exception e) {e.printStackTrace();} finally {// 釋放鎖lock.unlock();}}

  }

  public static void main(String[] args) {
  Thread09 thread09 = new Thread09();
  Thread t1 = new Thread(thread09);
  Thread t2 = new Thread(thread09);
  t1.start();
  t2.start();
  }
  }

Condition用法
public class Thread10 {
private ReentrantLock lock = new ReentrantLock();
private Condition condition = lock.newCondition();

public static void main(String[] args) {Thread10 thread10 = new Thread10();try {thread10.print();Thread.sleep(3000);thread10.signal();} catch (Exception e) {} }public void print() {new Thread(() -> {try {// 釋放鎖 同時當前線程阻塞lock.lock();System.out.println(Thread.currentThread().getName() + ",1");condition.await();System.out.println(Thread.currentThread().getName() + ",2");} catch (Exception e) {e.printStackTrace();} finally {lock.unlock();}}).start(); }public void signal() {try {lock.lock();condition.signal();} catch (Exception e) {e.printStackTrace();} finally {lock.unlock();} }

}

總結

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