java 中实现多线程 java实现多线程步骤

Java中有两种实现多线程的方法:Thread类,Runnable接口.下面的代码简单介绍了这两种方法.

Thread类:继承Thread类并重新实现其中的run()方法

public class MyThread extends Thread {
 int count;
 String name; public MyThread(String name, int ct) {
  this.name = name;
  count = ct;
  System.out.println("创建线程:" + name);
 } public void run() {
  for (int i = 1; i < count + 1; i++) {
   System.out.println("运行:" + name + "(" + i + ")");
  }
 } public static void main(String args[]) {
  new MyThread("Thread1", 5).start();
  new MyThread("Thread2", 3).start();
  new MyThread("Thread3", 4).start();
 }
}

 

Runnable接口:Runnable中只定义了一个run()方法,实现Runnable的对象中必须定义此方法.在新建Thread对象时将实现Runnable的对象作为参数传入,Tread对象会调用其中的run()方法.

public class MyRunnable implements Runnable {
 int count;
 String name;
 public MyRunnable(String name, int ct) {
  this.name = name;
  count = ct;
  System.out.println("创建线程:" + name);
 } public void run() {
  for (int i = 1; i < count + 1; i++) {
   System.out.println("运行:" + name + "(" + i + ")");
  }
 } public static void main(String args[]) {
  new Thread(new MyRunnable("Thread1", 5)).start();
  new Thread(new MyRunnable("Thread2", 3)).start();
  new Thread(new MyRunnable("Thread3", 4)).start();
 }
}