多线程三种主要实现方式：继承Thread类，实现Runnable接口、Callable和Futrue。
一、简单实现
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import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;
import java.util.concurrent.TimeUnit;
public class T02_HowToCreateThread {
//1.继承Thread类
static class MyThread extends Thread{
@Override
public void run() {
System.out.println("MyThread-->");
}
}
//3.实现Runnable接口
static class MyRun implements Runnable{
@Override
public void run() {
System.out.println("MyRunable-->");
}
}
//4.实现Callable接口
static class MyCall implements Callable{
@Override
public Object call() throws Exception {
System.out.println("myCallable-->");
return 1;
}
}
public static void main(String[] args) throws ExecutionException, InterruptedException {
//1.继承Thread类
new MyThread().start();
//2.lambda与继承Thread类类//1.继承Thread类似，最简单
new Thread(()->{
System.out.println("lambda-->");
}).start();
//3.实现Runnable接口
new Thread(new MyRun()).start();
new Thread(new Runnable() {
@Override
public void run() {
System.out.println("simple->Runnable");
}
}).start();
//4.实现Callable接口,并用包装器FutureTask来同时实现Runable、Callable两个接口,可带返回结果
MyCall mycall = new MyCall();
FutureTask futureTask = new FutureTask(mycall);
new Thread(futureTask).start();
System.out.println(futureTask.get());
}
}
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二、使用ExecutorService、Callable和Future一起实现带返回值
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import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.*;
/**
* 使用ExecutorsService、Callable、Future来实现多个带返回值的线程
*/
public class T02_HowToCreateThread02 {
static class MyCallable implements Callable{
private int taskNum;
public MyCallable(int taskNum){
this.taskNum = taskNum;
}
@Override
public Object call() throws Exception {
System.out.println("任务"+taskNum);
return "MyCallable.call()-->task"+taskNum;
}
}
public static void main(String[] args) throws ExecutionException, InterruptedException {
int num = 5;
//创建一个线程池
ExecutorService pool = Executors.newFixedThreadPool(num);
List<Future> futureList = new ArrayList<Future>();
for (int i = 0; i < num; i++){
MyCallable mc = new MyCallable(i);
//执行任务，并返回值
Future future = pool.submit(mc);
futureList.add(future);
}
pool.shutdown();
for (Future f: futureList){
System.out.println(f.get());
}
}
}
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结果：
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快网idc。
原文链接：https://www.cnblogs.com/helq/p/13264050.html
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