JAVA面向对象学习——java多线程———线程的创建和启动——实现Runnable接口创建线程类...

川长思鸟来 2023-09-30 12:20 38阅读 0赞

## 实现Runnable接口创建线程类 ##

(1)定义Runnable接口的实现类，并重写该接口的run方法，该run方法的方法体同样是该线程的线程执行体。

(2)创建Runnable实现类的实例，并以此实例作为Thread的target来创建Thread对象，该Thread对象才是真正的线程对象。

(3)调用线程对象的start方法来启动该线程。

![db2ea2629118b86d57b70fc3cc3ce0ad.png][]

![05857fe07ad8c434e929149a70438253.png][]

![8d24a1d371f4d1ab46bd68ae6387fd99.png][]

// 通过实现Runnable接口来创建线程类
    public class SecondThread implements Runnable
    {
    	private int i;
    	// run方法同样是线程执行体
    	public void run()
    	{
    		for ( ; i < 100; i++)
    		{
    			// 当线程类实现Runnable接口时，
    			// 如果想获取当前线程，只能用Thread.currentThread()方法。
    			System.out.println(Thread.currentThread().getName()
    				+ " " + i);
    		}
    	}
    
    	public static void main(String[] args)
    	{
    		for (var i = 0; i < 100; i++)
    		{
    			System.out.println(Thread.currentThread().getName()
    				+ " " + i);
    			if (i == 20)
    			{
    				var st = new SecondThread();     // ①
    				// 通过new Thread(target, name)方法创建新线程
    				new Thread(st, "新线程1").start();
    				new Thread(st, "新线程2").start();
    			}
    		}
    	}
    }

============================================================================

public class SecondThread implements Runnable
    {
        private int i;
    
        public void run()
        {
            for ( i = 0; 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)
                {
                    SecondThread st = new SecondThread();
    
                    new Thread(st, "xiancehng---1").start();
    
                    new Thread(st, "xiancehng---2").start();
                }
            }
        }
    }

> Task :SecondThread.main()

main 0  
main 1  
main 2  
main 3  
main 4  
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main 22  
main 23  
xiancehng---1 0  
main 24  
xiancehng---2 0  
xiancehng---2 1  
xiancehng---2 2  
xiancehng---1 1  
xiancehng---2 3  
main 25  
xiancehng---2 5  
xiancehng---1 4  
xiancehng---2 6  
main 26  
main 27  
main 28  
xiancehng---2 8  
xiancehng---2 9  
xiancehng---1 7  
xiancehng---2 10  
xiancehng---2 12  
xiancehng---2 13  
xiancehng---2 14  
xiancehng---2 15  
xiancehng---2 16  
xiancehng---2 17  
xiancehng---2 18  
xiancehng---2 19  
xiancehng---2 20  
xiancehng---2 21  
main 29  
main 30  
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main 32  
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main 34  
main 35  
xiancehng---2 22  
xiancehng---1 11  
xiancehng---2 23  
main 36  
main 37  
xiancehng---2 25  
xiancehng---1 24  
xiancehng---2 26  
xiancehng---2 28  
main 38  
xiancehng---2 29  
xiancehng---2 30  
xiancehng---2 31  
xiancehng---2 32  
xiancehng---2 33  
xiancehng---2 34  
xiancehng---2 35  
xiancehng---2 36  
xiancehng---2 37  
xiancehng---2 38  
xiancehng---1 27  
xiancehng---2 39  
main 39  
xiancehng---2 41  
xiancehng---1 40  
xiancehng---1 43  
xiancehng---1 44  
xiancehng---1 45  
xiancehng---1 46  
xiancehng---1 47  
xiancehng---1 48  
xiancehng---1 49  
xiancehng---1 50  
xiancehng---1 51  
xiancehng---1 52  
xiancehng---1 53  
xiancehng---1 54  
xiancehng---2 42  
main 40  
xiancehng---2 56  
xiancehng---1 55  
xiancehng---1 58  
xiancehng---1 59  
xiancehng---2 57  
main 41  
xiancehng---2 61  
xiancehng---2 62  
xiancehng---2 63  
xiancehng---2 64  
xiancehng---2 65  
xiancehng---2 66  
xiancehng---2 67  
xiancehng---2 68  
xiancehng---2 69  
xiancehng---2 70  
xiancehng---2 71  
xiancehng---2 72  
xiancehng---2 73  
xiancehng---2 74  
xiancehng---2 75  
xiancehng---2 76  
xiancehng---1 60  
xiancehng---1 78  
xiancehng---1 79  
xiancehng---1 80  
xiancehng---2 77  
main 42  
xiancehng---2 82  
xiancehng---2 83  
xiancehng---2 84  
xiancehng---2 85  
xiancehng---2 86  
xiancehng---2 87  
xiancehng---2 88  
xiancehng---2 89  
xiancehng---2 90  
xiancehng---2 91  
xiancehng---2 92  
xiancehng---2 93  
xiancehng---2 94  
xiancehng---2 95  
xiancehng---1 81  
xiancehng---2 96  
xiancehng---2 98  
xiancehng---2 99  
main 43  
main 44  
xiancehng---1 97  
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[db2ea2629118b86d57b70fc3cc3ce0ad.png]: https://img-blog.csdnimg.cn/img_convert/db2ea2629118b86d57b70fc3cc3ce0ad.png
[05857fe07ad8c434e929149a70438253.png]: https://img-blog.csdnimg.cn/img_convert/05857fe07ad8c434e929149a70438253.png
[8d24a1d371f4d1ab46bd68ae6387fd99.png]: https://img-blog.csdnimg.cn/img_convert/8d24a1d371f4d1ab46bd68ae6387fd99.png