Java多线程及线程安全实现方法解析

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{
@override
public 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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