Thread--Thread和Runnable

Love The Way You Lie 2022-06-18 03:54 230阅读 0赞

在Java中常用的实现多线程的两种方式是使用Thread类或者实现Runnable接口。

Runnable是一个接口，并且只包含了一个run()方法。

基于Java8的Runnable源码：

@FunctionalInterface
    public interface Runnable {
    /**
         * When an object implementing interface <code>Runnable</code> is used
         * to create a thread, starting the thread causes the object's
         * <code>run</code> method to be called in that separately executing
         * thread.
         * <p>
    * The general contract of the method <code>run</code> is that it may
         * take any action whatsoever.
         *
         * @see     java.lang.Thread#run()
         */
    public abstract void run();
    }

Runnable示例代码：实现Runnable接口，再通过Thread的构造函数创建线程。

public class MyThread  implements Runnable{
    
    private int ticket=10;
        public void run() {
            // TODO 自动生成的方法存根
            for(int i=0;i<20;i++)
            {
                if(this.ticket>0)
                {
                    System.out.println(Thread.currentThread().getName()+" 卖票：ticket"+this.ticket--);
                }
            }
        }
    }

public class Hello {
    
    public static void main(String [] agrs)
     {
            MyThread myThread=new MyThread();
            Thread t1=new Thread(myThread);
            Thread t2=new Thread(myThread);
            Thread t3=new Thread(myThread);
    
            t1.start();
            t2.start();
            t3.start();
        }
    }

结果：

Thread-0 卖票：ticket10

Thread-2 卖票：ticket10

Thread-1 卖票：ticket10

Thread本身是一个类，然后它实现了Runnable接口，因此在使用Thread时我们只需要继承Thread并重写它的run()方法就好。

Thread示例：

public class NewThread  extends Thread{
    private int ticket=10;
        public void run()
        {
            for(int i=0;i<20;i++)
            {
                if(this.ticket>0)
                {
                    System.out.println(this.getName()+" 卖票：ticket"+this.ticket--);
                }
            }
        }
    }

public class Hello {
    
    public static void main(String [] agrs)
        {
            NewThread t1=new NewThread();
            NewThread t2=new NewThread();
            NewThread t3=new NewThread();
    
            t1.start();
            t2.start();
            t3.start();
        }
    }

运行结果：

Thread-0 卖票：ticket10

Thread-0 卖票：ticket9

Thread-0 卖票：ticket8

Thread-0 卖票：ticket7

Thread-0 卖票：ticket6

Thread-0 卖票：ticket5

Thread-0 卖票：ticket4

Thread-0 卖票：ticket3

Thread-0 卖票：ticket2

Thread-2 卖票：ticket10

Thread-2 卖票：ticket9