《多线程编程》——创建线程的两种方式

 1 /**
 2    *两个构造器也有区别：线程名不同
 3    */
 4 public class Thread implements Runnable {
 5 private char   name[];
 6 
 7    //1.不带参
 8    /*
 9     *Automatically generated names are of the form *"Thread-"+n, where n is an integer
10     */
11    public Thread() {
12         init(null, null, "Thread-" + nextThreadNum(), 0);
13     }
14     private static synchronized int nextThreadNum() {
15         return threadInitNumber++;
16     }
17    //2.带参
18     public Thread(String name) {
19         init(null, null, name, 0);
20     }
21   //初始化线程—init()?
22     private void init(ThreadGroup g, Runnable target, String name,long stackSize) {
23         init(g, target, name, stackSize, null);
24     }
25     private void init(ThreadGroup g, Runnable target, String name,long stackSize, AccessControlContext acc) {
26         if (name == null) {
27             throw new NullPointerException("name cannot be null");
28         }
29         this.name = name.toCharArray();
30          /**后面是初始化线程代码—略*/
31     }
32 }

public interface Runnable {

      public abstract void run();

 }

/*
 *用“外置Runnable对象”覆盖、取代当前对象（目的是让注入对象也能拥有Thread对象的管理线程的方法）
 */
public class Thread implements Runnable {

public void run() {
        if (target != null) {   
            target.run();     //运行“外置线程对象”
        }

//至于其它方法，针对的对象都是Thread.currentThread()
    }

/**
  *1.构造类
  */
public class MyThread extends Thread {
    //@Override    //是否覆盖父类对象的run()方法
    public void run() {
         //do something
       }
}
/**
  *2.创建实例
  */
public class Main{
    public void static void main(String args){
             Thread t =new MyThread();    
                    t.run();   //t的run()被调用；t的线程启动

        }
}

public class MyThread implements Runnable {
    public run() {
         //do something
    }

/**
  *2.创建实例
  */
public class Main{
    public void static void main(String args){

             MyThread mt =new MyThread();

             Thread t =new Thread(mt); //创建Thread线程——>方式二 
                    t.run();   //t的run()被调用；mt的线程启动，t的线程未启动
        }

}