java中如何给Runnable线程传递参数？

客官°小女子只卖身不卖艺 2022-03-17 02:38 387阅读 0赞

向线程中传递数据的三种方法：

### 一、通过构造函数传递参数 ###

public class MyThread1 extends Thread
    {
        private String name;
        public MyThread1(String name)
        {
            this.name = name;
        }
        public void run()
        {
            System.out.println("hello " + name);
        }
        public static void main(String[] args)
        {
            Thread thread = new MyThread1("world");
            thread.start();        
        }
    }

### 二、通过变量和方法传递数据 ###

public class MyThread2 implements Runnable
    {
        private String name;
        public void setName(String name)
        {
            this.name = name;
        }
        public void run()
        {
            System.out.println("hello " + name);
        }
        public static void main(String[] args)
        {
            MyThread2 myThread = new MyThread2();
            myThread.setName("world");
            Thread thread = new Thread(myThread);
            thread.start();
        }
    }

### 三、通过回调函数传递数据 ###

class Data
    {
        public int value = 0;
    }
    class Work
    {
        public void process(Data data, Integer numbers)
        {
            for (int n : numbers)
            {
                data.value += n;
            }
        }
    }
    public class MyThread3 extends Thread
    {
        private Work work;
     
        public MyThread3(Work work)
        {
            this.work = work;
        }
        public void run()
        {
            java.util.Random random = new java.util.Random();
            Data data = new Data();
            int n1 = random.nextInt(1000);
            int n2 = random.nextInt(2000);
            int n3 = random.nextInt(3000);
            work.process(data, n1, n2, n3);   // 使用回调函数
            System.out.println(String.valueOf(n1) + "+" + String.valueOf(n2) + "+"
                    + String.valueOf(n3) + "=" + data.value);
        }
        public static void main(String[] args)
        {
            Thread thread = new MyThread3(new Work());
            thread.start();
        }
    }