java并发编程专题（二）----如何创建并运行java线程

public interface Runnable {
 public abstract void run();
}

public class Thread implements Runnable {
 public synchronized void start() {  
  if (threadStatus != 0)
   throw new IllegalThreadStateException();  
  group.add(this);
  boolean started = false;
  try {
   start0();
   started = true;
  } finally {
   try {
    if (!started) {
     group.threadStartFailed(this);
    }
   } catch (Throwable ignore) {
    /* do nothing. If start0 threw a Throwable then
     it will be passed up the call stack */
   }
 }
 @Override
 public void run() {
  if (target != null) {
   target.run();
  }
 }
}

public class ThreadDemo3 {   
 public static void main(String[] args) { 
  //new了两个线程对象——s1和s2
  //其中两个对象各对应一个内存区域。线程运行过程中运行都是自己内存块中的数据  
  Shop1 s1 = new Shop1("小武");
  s1.start();

  Shop1 s2 = new Shop1("小潘");
  s2.start();   
  /*
  //实例化了两个线程对象，所以分配了两块内存空间
  //执行过程中操作的是自己的内存空间
  Shop2 s3 = new Shop2("小武");
  s3.run();    
  Shop2 s4 = new Shop2("小潘");
  s4.run();   
  //实际实例化了两个线程对象
  //所以同样分配两个内存空间
  Thread t1 = new Thread(new Shop2("小武"));
  t1.start();

  Thread t2 = new Thread(new Shop2("小潘"));
  t2.start();
  */   
  //创建了两个线程对象，但是使用的是同一个对象——s6 
  Shop2 s5 = new Shop2("w");  
  Shop1 s6 = new Shop1("T");
  Thread t3 = new Thread(s6);
  t3.start();

  Thread t4 =new Thread(s6);
  t4.start();      
 }
}

/**
 * 武大郎卖烧饼（因为业务的拓展，现在可以实现多窗口的出售）
 *  要求：每天只卖10个
 *
 */
class Shop1 extends Thread{
 //private int count = 10;
 //使用静态变量可以有效的实现资源共享（因为在内存中只有一份count）
 private static int count = 10;
 public Shop1(String name) {
  super(name);
 }
 public void run(){
  //判断是否已经卖完
  while(count>0){
   count--;
   System.out.println(this.getName() +"卖出了一个烧饼" + ",现在剩余" + count);
  }
 }
}

/**
 * 使用接口实现上面的代码
 *
 */
class Shop2 implements Runnable{
 //私有变量，存储剩余烧饼的个数
 private int count = 10;
 //存储当前人的姓名
 private String name="";

 public Shop2(String name) {
  this.name = name;
 }

 /**
  * 实现销售的方法
  */
 public void run(){
  //判断是否已经卖完
  while(count>0){
   count--;
   System.out.println(Thread.currentThread().getId() + "、" + this.name +"卖出了一个烧饼" + ",现在剩余" + count);
  }
 }
}

public class Test{
  public static void main(String[] args) {
    //传统方式——单任务方式
    /*
    SimpleClass sc1 = new SimpleClass();
    sc1.say("Mike");

    SimpleClass sc2 = new SimpleClass();
    sc2.say("Han Meimei");
    */
    //创建一个线程
    ThreadClass tc1 = new ThreadClass("Mike");
    //启动线程
    tc1.start();
    //创建一个线程
    ThreadClass tc2 = new ThreadClass("Han Meimei");
    tc2.start();

   } 
  }
 }

 class SimpleClass{
  public void say(String name){
   while(true){
    System.out.println("Hi,Im " + name);
   }
  }
 }
 class ThreadClass extends Thread{
  public ThreadClass(String name) {
   super(name);
  }

  /**
   * 将父类（Thread）的run()方法进行重写
   * 在run()方法中包含了需要执行的代码
   */
  public void run(){
   while(true){
    System.out.println("Hi,Im " + this.getName() + "|" + this.getId() + "|" + this.getStackTrace());
   }
  }
 }

 Shop1 s6 = new Shop1("T");
 Thread t3 = new Thread(s6);
 t3.start();