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Synchronize关键字和可重入锁lock

JDK6.0 优化后这俩的性能已经差不多了。

不同点：

1. lock 申请锁时可以限制申请时间，可以设置为申请到锁后响应中断（可以用于处理死锁问题），也可以设置为公平锁。
2. Synchronize 配合Object的wait()、notify()。可重入锁配合Condition条件。

注意点：

Synchronize关键字配合Object的wait()、notify()

import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.Future;import java.util.concurrent.locks.Condition;import java.util.concurrent.locks.Lock;import java.util.concurrent.locks.ReentrantLock;/** * @author: Mr.Hu */public class Main implements Runnable{
       static Object object=new Object();    private static Lock lock=new ReentrantLock();    private static Condition condition=lock.newCondition();    public static void main(String[] args) throws Exception {
           ExecutorService threadPool = Executors.newCachedThreadPool();        Main main=new Main();        Future future=threadPool.submit(main);  //接收future 否则线程错误无法发现        System.out.println("条件满足");        Thread.sleep(1000);     //等待线程运行到wait        synchronized (object){
             //wait 也要先获得对象锁            object.notify();        }        future.get();    }    @Override    public void run() {
           synchronized (object){
         //类似Condition 先获得锁再操作            try {
                   object.wait();                System.out.println("goOn");            } catch (InterruptedException e) {
                   e.printStackTrace();            }        }    }}

重入锁搭档：Condition条件

import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import java.util.concurrent.Future;import java.util.concurrent.locks.Condition;import java.util.concurrent.locks.Lock;import java.util.concurrent.locks.ReentrantLock;/** * @author: Mr.Hu */public class Main implements Runnable{
       private static Lock lock=new ReentrantLock();    private static Condition condition=lock.newCondition();    public static void main(String[] args) throws Exception {
           ExecutorService threadPool = Executors.newCachedThreadPool();        Main main=new Main();        Future future=threadPool.submit(main);  //接收future 否则线程错误无法发现        System.out.println("条件满足");        Thread.sleep(1000);     //等待线程运行到condition        lock.lock();        condition.signal();     //通知condition要先持有相关重入锁        lock.unlock();        future.get();    }    @Override    public void run() {
           try {
               lock.lock();            condition.await();          //condition 配合可重入锁  await()会释放当前的锁，signal()方法会重新获得锁并继续执行            lock.unlock();            System.out.println("goOn");        } catch (InterruptedException e) {
               e.printStackTrace();        }        finally {
               lock.unlock();        }    }}

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