多線程三種主要實現(xiàn)方式：繼承Thread類，實現(xiàn)Runnable接口、Callable和Futrue。
一、簡單實現(xiàn)
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
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.繼承Thread類 static class MyThread extends Thread{ @Override public void run() { System.out.println("MyThread-->"); } } //3.實現(xiàn)Runnable接口 static class MyRun implements Runnable{ @Override public void run() { System.out.println("MyRunable-->"); } } //4.實現(xiàn)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.繼承Thread類 new MyThread().start(); //2.lambda與繼承Thread類類//1.繼承Thread類似，最簡單 new Thread(()->{ System.out.println("lambda-->"); }).start(); //3.實現(xiàn)Runnable接口 new Thread(new MyRun()).start(); new Thread(new Runnable() { @Override public void run() { System.out.println("simple->Runnable"); } }).start(); //4.實現(xiàn)Callable接口,并用包裝器FutureTask來同時實現(xiàn)Runable、Callable兩個接口,可帶返回結果 MyCall mycall = new MyCall(); FutureTask futureTask = new FutureTask(mycall); new Thread(futureTask).start(); System.out.println(futureTask.get()); }} |
二、使用ExecutorService、Callable和Future一起實現(xiàn)帶返回值
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
import java.util.ArrayList;import java.util.List;import java.util.concurrent.*;/** * 使用ExecutorsService、Callable、Future來實現(xiàn)多個帶返回值的線程 */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("任務"+taskNum); return "MyCallable.call()-->task"+taskNum; } } public static void main(String[] args) throws ExecutionException, InterruptedException { int num = 5; //創(chuàng)建一個線程池 ExecutorService pool = Executors.newFixedThreadPool(num); List<Future> futureList = new ArrayList<Future>(); for (int i = 0; i < num; i++){ MyCallable mc = new MyCallable(i); //執(zhí)行任務，并返回值 Future future = pool.submit(mc); futureList.add(future); } pool.shutdown(); for (Future f: futureList){ System.out.println(f.get()); } }} |
結果：
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：https://www.cnblogs.com/helq/p/13264050.html
