java 线程基本方法(内容来源于网络)_java thread ctrl c-优快云博客

本文介绍了Java中三种创建多线程的方法：继承Thread类、实现Runnable接口及使用Callable与Future。通过具体代码示例展示了不同方式的特点及应用场景。

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Thread方式
- extends Thread，覆盖Thread run方法，new当前类start()调用（直接调用run方法，会被识别为普通方法）

//测试代码才写main，实际运用最好异步实体单独封装，业务中调用
public class TestCompare extends Thread {
    int i = 0;
    public void run(){
        for(;i<100; i++){
            System.out.println(getName()+"  --- "+i);
        }
    }

    public static void main(String[] args) {
       for(int i=0; i< 100;i++){
           System.out.println(Thread.currentThread().getName() + "  :" +i);
           if(i == 20){
               System.out.println("此时主线程："+ i);
               new TestCompare().start();
               new TestCompare().start();
           }
       }
    }
}

Runnable方式
- implements Runnable，覆盖Runnable run方法，new Thread("new 当前类","线程名") start()调用

public class TestCompare implements Runnable{
    int i = 0;
    public void run(){
        for(;i<100; i++){
            System.out.println(Thread.currentThread().getName()+"  --- "+i);
        }
    }

    public static void main(String[] args) {
       for(int i=0; i< 100;i++){
           System.out.println(Thread.currentThread().getName() + "  :" +i);
           if(i == 20){
               System.out.println("此时主线程："+ i);
               new Thread(new TestCompare(),"新线程1").start();
               new Thread(new TestCompare(),"新线程2").start();
           }
       }
    }
}

Callable和Future方式
- implements Callable，FutureTask包装，new Thread("futureTask").start()调用
- Future 引用博客https://blog.youkuaiyun.com/u014209205/article/details/80598209

public class TestCompare implements Callable {
    @Override
    public Integer call() throws Exception {
        int sum = 0;
        for (int i = 1; i < 101; i++) {
            sum += i;
        }
        System.out.println(Thread.currentThread().getName() + " is running: " + sum);
        return sum;
    }

    public static void main(String[] args) {
        FutureTask<Integer> futureTask = new FutureTask<>(new TestCompare());
        new Thread(futureTask).start();
        try {
            System.out.println("子线程的返回值: " + futureTask.get());
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }
        System.out.println("这边呢");
    }
}