java多线程编程之Synchronized块同步方法.docVIP

java多线程编程之Synchronized块同步方法 这篇文章主要介绍了java多线程编程之Synchronized块同步方法，synchronized关键字又称同步锁，当方法执行完后，会自动释放锁锁，只有一个线程能进入此方法，看看下文中各种例子对synchronized的详细解释 文章分享了4个例子对synchronized的详细解释 1、是否加synchronized关键字的不同 public class ThreadTest { public static void main(String[] args) { Example example = new Example(); Thread t1 = new Thread1(example); Thread t2 = new Thread1(example); t1.start(); t2.start(); }} class Example { public synchronized void excute() { for (int i = 0; i 5; ++i) { try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(excute: + i); } } } class Thread1 extends Thread { private Example example; public Thread1(Example example) { this.example = example; } @Override public void run() { example.excute(); }} 加了synchronized关键字的输出结果如下 会先输出一组0-4，接着再输出下一组，两个线程顺序执行 excute:0 excute:1 excute:2 excute:3 excute:4 excute:0 excute:1 excute:2 excute:3 excute:4 没加synchronized关键字的输出结果如下 两个线程同时执行excute方法，同时并发的 excute:0 excute:0 excute:1 excute:1 excute:2 excute:2 excute:3 excute:3 excute:4 excute:4 2、多个方法的多线程情况 public class ThreadTest { public static void main(String[] args) { Example example = new Example(); Thread t1 = new Thread1(example); Thread t2 = new Thread2(example); t1.start(); t2.start(); }} class Example { public synchronized void excute() { for (int i = 0; i 5; ++i) { try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(excute: + i); } } public synchronized void excute1() { for (int i = 0; i 5; ++i) { try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(excute1: + i); } } } class Thread1 extends Thread { private Example example; public Thread1(Example example) { this.example = example; } @Override