jlab0801.java

java教程中的编程实例

public class JLab0801{
          public static void main(String[] args){
                 PrintThread thread1,thread2,thread3,thread4;
                  thread1 =new PrintThread("thread1");
                  thread2 =new PrintThread("thread2");
                  thread3 =new PrintThread("thread3");
                  thread4 =new PrintThread("thread4");
                  System.err.println("\nStarting threads");
                   thread1.start();
                   thread2.start();
                   thread3.start();
                   thread4.start();
                  System.err.println("Threads started\n");
                  }
                }
             class PrintThread extends Thread{
                    private int sleepTime;
                    public PrintThread(String name){
                         super(name);
                         sleepTime=(int)(Math.random()*5000);
                         System.err.println("Name:"+getName()+";sleep:"+sleepTime);
                         }
                     public void run(){
                       try{
                          System.err.println(getName()+" going to sleep");
                           Thread.sleep(sleepTime); 
                        }catch(InterruptedException interruptedException){
                         System.err.println(interruptedException.toString());
                           }
                          System.err.println(getName()+" done sleeping");
                       }
                      }