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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