一、java多线程实现的两种方式

1、继承Thread

/** * * @version: 1.1.0 * @Description: 多线程 * @author: wsq * @date: 2020年6月8日下午2:25:33 */public class MyThread extends Thread{@Overridepublic void run() { System.out.println("This is the first thread!");}public static void main(String[] args) { MyThread mt = new MyThread(); mt.start();}}

2、实现 Runnable 接口

public class MultithreadingTest {public static void main(String[] args) { new Thread(() -> System.out.println("This is the first thread!")).start();}}

或者

public class MyThreadImpl implements Runnable{private int count = 5; @Override public void run() { // TODO Auto-generated method stub count--; System.out.println("Thread"+Thread.currentThread().getName()+"count:"+count); }}

二、解决线程不安全问题

/** * * @version: 1.1.0 * @Description: 测试类 * @author: wsq * @date: 2020年6月8日下午9:27:02 */public class Test { public static void main(String[] args) { MyThreadImpl myThreadImpl = new MyThreadImpl(); Thread A = new Thread(myThreadImpl,"A"); Thread B = new Thread(myThreadImpl,"B"); Thread C = new Thread(myThreadImpl,"C"); Thread D = new Thread(myThreadImpl,"D"); Thread E = new Thread(myThreadImpl,"E"); A.start(); B.start(); C.start(); D.start(); E.start(); }}

打印结果为：

ThreadBcount:3
ThreadCcount:2
ThreadAcount:3
ThreadDcount:1
ThreadEcount:0

B和A共用一个线程，存在线程安全问题

改成：

public class MyThreadImpl implements Runnable{private int count = 5; @Override　　// 使用同步解决线程安全问题 synchronized public void run() { // TODO Auto-generated method stub count--; System.out.println("Thread"+Thread.currentThread().getName()+"count:"+count); }}

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