Simple API introduction to threads in Java

Briefly introduce the methods of the Thread class

1、set/getName

Set and get thread name

Thread t2 = new Thread(new Runnable() {
    @Override
public void run() {
        for (int i=0;i<10;i++){    
            System.out.println(i);
        }
    }
}) ;
 t2.setName( " I am thread 2" ) ;

Use setName to set a name for a thread

Thread t1 = new Thread(){
    @Override
public void run() {
        for (int i=0;i<10;i++){    
            System.out.println(this.getName()+i);
        }
    }
};

Use the getName() method to get the name of the thread

2. Get the current thread object

Thread t1 = new Thread(){
    @Override
public void run() {
        for (int i=0;i<10;i++){    
            System.out.println(Thread.currentThread().getName()+i);
        }
    }
};

Use the static method currentThread of the Thread class to get the current thread object

3. Thread sleep

Thread t1 = new Thread(){
    @Override
public void run() {
        for (int i=0;i<10;i++){
            if (i==5) {
                try {    
                    Thread.sleep(5);
                } catch (InterruptedException e) {
                    e.printStackTrace () ;
                }
            }
            System.out.println(getName()+i);
        }
    }
};

Using the static method sleep method of the Thread class, how many milliseconds can the current thread sleep? During the sleep period, other threads can obtain CPU resources.

4、设置守护线程

t1.setDaemon(true);

设置一个线程为守护线程, 该线程不会单独执行, 当其他非守护线程都执行结束后, 自动退出。比如垃圾回收线程就是守护线程，要注意的是要将线程设置为守护线程，必须在线程调用start方法之前调用setDaemon方法

5、加入线程

public final void join() throws InterruptedException {
    join(0);
}

当前线程暂停, 等待指定的线程执行结束后, 当前线程再继续。

6、礼让线程

public static native void yield();

让线程放弃CPU资源，并不代表其他线程一定能抢到CPU资源，当前线程有可能继续执行。

7、停止线程

public void interrupt()

调用interupt方法仅仅是在当前线程中打了一个停止的标记，并不是真的停止线程

要想停止线程，可以将interupt方法和interupted方法一起使用

看下面代码:

public static void main(String[] args) throws InterruptedException {
    Thread t1 = new Thread(){
        @Override
        public void run() {
            try {
                for (int i=0;i<100000;i++){
                    if (this.interrupted()){
                        System.out.println("我要结束了!!!");
                        throw new InterruptedException();
                    }
                    System.out.println(getName()+i);
                }
            } catch (InterruptedException e) {
                e.printStackTrace () ;
            }
        }
    };
    try {

        t1.start();
        Thread.sleep(500);
        t1.interrupt();
    }catch (Exception e){
        e.printStackTrace () ;
    }
}

Use an exception to stop the thread.

Simple API introduction to threads in Java

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