Java创建多线程的方式

方式一：继承Thread类

public class Demo06 extends Thread{
    public static void main(String[] args) {
        Demo06 demo06=new Demo06();
        demo06.start();
    }
    @Override
    public void run() {
        System.out.println("子线程被调用");
    }
}

方式二：实现Runnable接口

public class Demo04 implements Runnable{
    public static void main(String[] args) {
        //多线程创建方式二：
        Demo04 demo04=new Demo04();
        Thread thread=new Thread(demo04,"subThread");
        thread.start();
        for (int i = 0; i < 10; i++) {
            System.out.println(i);
        }
    }

    @Override
    public void run() {
        for (int i = 10; i < 20; i++) {
            System.out.println(i);
        }
    }
}

方式三：实现callable接口

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

public class Demo05 implements Callable {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        //创建线程方式3
        Demo05 demo05=new Demo05();
        FutureTask futureTask=new FutureTask<>(demo05);
        Thread thread=new Thread(futureTask);
        thread.start();
        Integer result = futureTask.get();
        System.out.println(result);
    }

    @Override
    public Integer call() throws Exception {
        for (int i = 0; i < 10; i++) {
            System.out.println(i);
            if (i==6){
                return i;
            }
        }
        return -1;
    }
}