线程创建方式

继承Thread类

public class TestThread extends Thread{
    private String url;
    private String name;
    public TestThread(String url,String name){
        this.url = url;
        this.name = name;
    }

    @Override
    public void run() {
        WebDownloadPic webDownloadPic = new WebDownloadPic();
        webDownloadPic.downLoadPic(url,name);
    }
    public static void main(String[] args) throws InterruptedException {
        TestThread thread1 = new TestThread("http://192.168.11.140:8085/pictures/picOne.png","1.jpg");
        TestThread thread2 = new TestThread("http://192.168.11.140:8085/pictures/picTwo.png","2.jpg");
        TestThread thread3 = new TestThread("http://192.168.11.140:8085/pictures/picOne.png","3.jpg");

        thread2.start();
        thread2.join();
        thread1.start();
        thread1.join();
        thread3.start();
    }
}

class WebDownloadPic{
    // 下载方法
    public void downLoadPic(String url,String name){
        try {
            FileUtils.copyURLToFile(new URL(url),new File(name));
            System.out.println(Thread.currentThread().getName() + ":下载图片:" + name);
            System.out.println();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

实现Runnable接口

与Thread的区别就是：实现Runnable接口可以一个对象跑多线程

public class TestRunable implements Runnable{
    private String name;
    public TestRunable(String name){
        this.name = name;
    }
    @Override
    public void run() {
        Test test = new Test();
        test.print(name);
    }
    public static void main(String[] args) {
        // ABC为线程名称
        TestRunable t1 = new TestRunable("A");
        TestRunable t2 = new TestRunable("B");
        TestRunable t3 = new TestRunable("C");
        // new Thread(t1,"A").start();
        new Thread(t1).start();
        new Thread(t3).start();
        new Thread(t2).start();
    }
}

class Test{
    public void print(String name){
        for(int i = 0 ; i < 100 ; i ++){
            System.out.println(Thread.currentThread().getName() + "打印了:" + name);
        }
    }

}

实现Callable接口

实现call()方法,别的不去了解