一、java多線程實現的兩種方式

1、繼承Thread

/** * * @version: 1.1.0 * @Description: 多線程 * @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、實現 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、解決線程不安全問題

/** * * @version: 1.1.0 * @Description: 測試類 * @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(); }}

打印結果為：

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

B和A共用一個線程，存在線程安全問題

改成：

public class MyThreadImpl implements Runnable{private int count = 5; @Override// 使用同步解決線程安全問題 synchronized public void run() { // TODO Auto-generated method stub count--; System.out.println('Thread'+Thread.currentThread().getName()+'count:'+count); }}

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