Java Runnable线程 Java向Runnable线程传递参数方法实例解析

时间:2021-04-22 marvel_cheng 人气:0

java Runnable接口：是一个接口，它里面只有一个run()方法，没有start()方法，继2113承Runnable并实现这个方法就可以实现多线程了，但是5261这个run()方法不能自4102己调用，必须由系统来调用。

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();
  }
}

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