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);
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
