线程实现的三种方法

1、范例 ：继承Thread类：Thread类是在java.lang包中定义的，继承Thread类必须重写ru荏鱿胫协n（）方法定义格式如下：package cn.test;class MyThread extends Thread{private String str;public MyThread(String str){this.str = str;}public void run() {for (int i = 0; i < 10; i++) {System.out.println(this.str+"="+i);}}}public class Test {public static void main(String[] args) {new MyThread("线程一").start();new MyThread("线程二").start();new MyThread("线程三").start();}}线程所有处理都在run（）中进行定义，线程启动是调用start（）方法，才是真正启动线程，而启动start（）方法时会自动调用run（）方法

2、范例： 实现runnable接口：package cn.test;class MyThread implements Runnable{private String str;public MyThread(String str){this.str = str;}public void run() {for (int i = 0; i < 10; i++) {System.out.println(this.str+"i="+i);}}}public class Test {public static void main(String[] args) {Thread t1 = new Thread(new MyThread("线程一："));Thread t2 = new Thread(new MyThread("线程二："));Thread t3 = new Thread(new MyThread("线程三："));t1.start();t2.start();t3.start();}}

3、范例：实现Callable接口package cn.test;import java.util.concurrent.Callable;i罪焐芡拂mport java.util.concurrent.ExecutionException;import java.util.concurrent.FutureTask;class MyThread implements Callable<String>{private String title;public MyThread(String title){this.title = title;}public String call()throws Exception{for (int i = 0; i < 10; i++) {System.out.println(title+"i="+i);}return "线程执行完毕";}}public class Test {public static void main(String[] args) throws InterruptedException, ExecutionException {FutureTask<String> task1 = new FutureTask<>(new MyThread("线程一"));FutureTask<String> task2 = new FutureTask<>(new MyThread("线程二"));new Thread(task1).start();new Thread(task2).start();System.out.println("线程返回数据一"+ task1.get());System.out.println("线程返回数据二"+ task2.get());}}