多线程（一）——三种实现方式

java中实现多线程的三种方式

继承Thread类

public class ExtendsThreadWay extends Thread{
 @Override
 public void run() {//重写 run 方法
        for (int i = 0; i < 10; i++) {
 System.out.println("------多线程-------" + i);
 }
 }
 public static void main(String[] args) {
 ExtendsThreadWay et = new ExtendsThreadWay();
 et.start();
 for (int i = 0; i < 10; i++) {
 System.out.println("主线程" + i);
 }
 }
}

实现Runable接口

public class AchieveRunnableWay implements Runnable{
 @Override
 public void run() {//实现接口
        for (int i = 0; i < 10; i++) {
 System.out.println("------多线程-------" + i);
 }
 }
 public static void main(String[] args) {
 Thread t = new Thread(new AchieveRunnableWay());
 t.start();
 for (int i = 0; i < 10; i++) {
 System.out.println("主线程" + i);
 }
 }

}

实现callable接口和future对象

public class AchieveCallableWay implements Callable<String> {
 @Override
 public String call() throws Exception {
 for (int i = 0; i < 10; i++) {
 System.out.println("------多线程-------" + i);
 }
 return null;
 }
 public static void main(String[] args) throws InterruptedException, ExecutionException {
 //其实就三步：1 创建Callable实例 
 //2将Callable实例设置进FutureTask实例中 
 //3将FutureTask实例作为Runnable类型设置进Thread中 
        AchieveCallableWay task = new AchieveCallableWay();
 FutureTask f = new FutureTask(task);
 new Thread(f).start();
 for (int i = 0; i < 10; i++) {
 System.out.println("主线程" + i);
 }
 }
}