Thread.sleep() Method

[Thomas Markl]

Why does this compile (Thread.sleep())???

class MyThread7 implements Runnable {
    public void run() {
      for(int i=0; i<10;i++)
       try{
        Thread.sleep(1);                      //Thread.sleep()-compiles!!!!!!!!!!!!!!
        System.out.println(Thread.currentThread().getName()+" ;i= "+i);//prints Thread-1
       } catch (InterruptedException x) {}
    }
}
public class TestMyThread7 {
  public static void main(String args[]) {
     MyThread7 first = new MyThread7(); //MyThread-Instanz erzeugen
     Thread myt = new Thread (first);   //Thread aus MyThread-Instanz erzeugen
     myt.start();                       //MyThread-Thread jetzt starten
     for(int i=0; i<1000;i++)
       System.out.println(Thread.currentThread().getName());//prints "main"-Thread
  }
}

And this (sleep() )doesn’t compile:

class MyThread7 implements Runnable {
    public void run() {
      for(int i=0; i<10;i++)
       try{
        sleep(1);               //sleep doesn’t compile!!!!!!!!!!!!!!
        System.out.println(Thread.currentThread().getName()+" ;i= "+i);//prints Thread-1
       } catch (InterruptedException x) {}
    }
}
public class TestMyThread7 {
  public static void main(String args[]) {
     MyThread7 first = new MyThread7();
      Thread myt = new Thread (first);   //
      myt.start();                       
     for(int i=0; i<1000;i++)
       System.out.println(Thread.currentThread().getName());//prints "main"-Thread
  }
}

C:\Java\EigeneJavaProgramme>javac TestMyThread7.java 
TestMyThread7.java:6: cannot resolve symbol
symbol  : method sleep  (int)
location: class MyThread7
        sleep(1);
        ^
1 error

[ edited to correct formatting -ds ]
[ September 07, 2002: Message edited by: Dirk Schreckmann ]

[Thomas Paul]

Because sleep() is a static method of the Thread class. TestMyThread7 does not extend the Thread class nor does it have its own sleep() method so it fails to compile.