java 多线程详解一 多线程的简单使用

1.线程的三种启动方式：
（1） 通过创建匿名内部类：

    public static void main(String[] args) {        new Thread(new Runnable() {            @Override            public void run() {                System.out.println(Thread.currentThread().getName());            }        }).start();    }

Thread-0Process finished with exit code 0

（2） 通过实现Runnable接口：

public class ThreadTest {    public static void main(String[] args) {        Thread thread1=new Thread(new ThreadByRunnable());        Thread thread2=new Thread(new ThreadByRunnable());        Thread thread3=new Thread(new ThreadByRunnable());        Thread thread4=new Thread(new ThreadByRunnable());        thread1.start();        thread2.start();        thread3.start();        thread4.start();    }}class ThreadByRunnable implements Runnable {    @Override    public void run() {        System.out.println(Thread.currentThread().getName());    }}

Thread-0Thread-1Thread-2Thread-3Process finished with exit code 0

（3） 通过继承Thread类：

public class ThreadTest {    public static void main(String[] args) {        ThreadByExtends thread1=new ThreadByExtends();        ThreadByExtends thread2=new ThreadByExtends();        ThreadByExtends thread3=new ThreadByExtends();        ThreadByExtends thread4=new ThreadByExtends();        thread1.start();        thread2.start();        thread3.start();        thread4.start();    }}class ThreadByExtends extends Thread{    @Override    public void run() {        super.run();        System.out.println(Thread.currentThread().getName());    }}

Thread-0Thread-1Thread-2Thread-3Process finished with exit code 0

2.实现Runnable接口的好处：

(1) 将线程的任务从线程的子类中分离出来，进行了单独的封装。
按照面向对象的思想将任务的封装成对象。

(2) 避免了java单继承的局限性。

所以，创建线程的第二种方式较为常用。