84 lines
2.2 KiB
Java
84 lines
2.2 KiB
Java
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package thread_safe.safe4;
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public class SynchronizedMethodLocakObject2 {
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public static void main(String[] args) {
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MyObject myObject = new MyObject();
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ThreadA threadA = new ThreadA(myObject);
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threadA.setName("ThreadA");
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ThreadB threadB = new ThreadB(myObject);
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threadB.setName("ThreadB");
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threadA.start();
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threadB.start();
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}
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// 测试对象
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public static class MyObject {
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/**
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* 测试方法A
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*/
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synchronized public void methodA() {
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try {
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System.out.println(Thread.currentThread().getName() + " 开始 " + System.currentTimeMillis());
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Thread.sleep(1000);
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System.out.println(Thread.currentThread().getName() + " 结束 " + System.currentTimeMillis());
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} catch (Exception exception) {
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exception.printStackTrace();
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}
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}
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/**
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* 测试方法B
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* 如果不加synchronized，整个程序是异步执行的
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* 如果加synchronized，整个程序是同步执行的
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*/
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synchronized public void methodB() {
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try {
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System.out.println(Thread.currentThread().getName() + " 开始 " + System.currentTimeMillis());
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Thread.sleep(1000);
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System.out.println(Thread.currentThread().getName() + " 结束 " + System.currentTimeMillis());
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} catch (Exception exception) {
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exception.printStackTrace();
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}
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}
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}
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// 线程A
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public static class ThreadA extends Thread {
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private final MyObject myObject;
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public ThreadA(MyObject myObject) {
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super();
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this.myObject = myObject;
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}
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@Override
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public void run() {
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super.run();
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myObject.methodA();
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}
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}
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// 线程B
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public static class ThreadB extends Thread {
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private final MyObject myObject;
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public ThreadB(MyObject myObject) {
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super();
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this.myObject = myObject;
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}
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@Override
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public void run() {
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super.run();
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myObject.methodB();
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}
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}
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}
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