线程的分类

import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.util.Date;


public class Test8 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // 使用后台线程创建10个临时文件

        Thread  t =new Thread(new Runnable(){
            @Override
            public void run() {
                //取出当前程序的运行目录
            URL url=    Test8.class.getClassLoader().getResource("");
            String dir =url.getFile();
            //URLEncoder.encode(dir);  中文路径    编码
                //创建临时文件
            for (int i = 0; i < 10; i++) {
                 File f=new File(dir,"tmp"+i+".txt");
                                 if(!f.exists()){
          try {
                                               Thread.sleep(1000);
          } catch (InterruptedException e) {

                               e.printStackTrace();
            }               
          try {
                            f.createNewFile();
                        } catch (IOException e) {           
                            e.printStackTrace();
                        }

                    }

                }

            }   
        });
        t.setDaemon(true);//设置精灵线程
        t.start();

        for(int i=0;i<=10000;i++){
            System.out.println(Thread.currentThread.getName()+"\t"+i);
        }


    }

}

import java.util.Date;


public class Test7 {

    public static void main(String[] args) {
        //主线程
        Thread t=Thread.currentThread();//取得当前程序所在的线程

        //一个线程的信息
        System.out.println("线程名"+ t.getName());
        System.out.println("线程的编号id"+ t.getId());
        System.out.println("线程的优先级"+ t.getPriority());//5     1-10
        System.out.println("线程组"+ t.getThreadGroup());


        ThreadGroup tg =new ThreadGroup("线程组");
        Mytime3 mt =new Mytime3(tg,new Runnable(){ //Thread里面有个构造方法  设置线程组
            @Override
            public void run() {
                boolean flag=true;
                while(flag){
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {

                        e.printStackTrace();
                    }

                    Date d=new Date();
                    System.out.println(d);
                }


            }


        });
        mt.setName("新线程");
        mt.setPriority(10);

        mt.start();

        System.out.println("线程名"+ mt.getName());
        System.out.println("线程的编号id"+ mt.getId());
        System.out.println("线程的优先级"+ mt.getPriority());//5     1-10
        System.out.println("线程组"+ mt.getThreadGroup());

    }
}
class Mytime3 extends Thread{

    public Mytime3(){}

    public Mytime3(ThreadGroup tg,Runnable r){
        super(tg,r);


    }


}