Java创建多线程的方式-优快云博客

本文详细介绍了Java中创建多线程的三种常见方法：继承Thread类、实现Runnable接口以及实现Callable接口。通过实例代码展示了每种方式的用法，包括创建线程、启动线程以及Callable接口返回值的获取。对于并发编程初学者，这些内容是理解Java多线程基础知识的重要部分。

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Java创建多线程的方式

方式一：继承Thread类

package com.scfenzhi.thread.create;

import org.junit.Test;

public class ExtendsThreadWay {

    @Test
    public void test1() {
        new SubThread().start();
    }


    private static class SubThread extends Thread {

        @Override
        public void run() {
            for (int i = 0; i < 100; i++) System.out.println(i);
        }

    }

}

方式二：实现Runnable接口方式

package com.scfenzhi.thread.create;

import org.junit.Test;

public class ImplementsRunnableWay {

    @Test
    public void test1() {
        new Thread(new SubThread()).start();
    }

    private static class SubThread implements Runnable {

        @Override
        public void run() {
            for (int i = 0; i < 100; i++) System.out.println(i);
        }
    }
}

方式三：实现Callable接口方式

package com.scfenzhi.thread.create;

import org.junit.Test;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

public class ImplementsCallableWay {

    @Test
    public void test1() throws ExecutionException, InterruptedException {
        FutureTask<String> futureTask = new FutureTask<>(new SubThread());
        futureTask.run();
        String result = futureTask.get();
        System.out.println(result);
    }

    private static class SubThread implements Callable<String> {

        @Override
        public String call() throws InterruptedException {
            StringBuilder stringBuilder = new StringBuilder();
            for (int i = 0; i < 100; i++) stringBuilder.append(i);
            Thread.sleep(5000);
            return stringBuilder.toString();
        }
    }

}