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

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

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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