Java Multithreading---Wait () & Join ()

Off Topic:

The interrupt () method does not interrupt a normal running thread!!!

Class MyThread extends thread{    @Override public    void Run () {for        (int i = 0; i <; i++) {            System.out . println (i);}}    public class Waittest {public    static void Main (string[] args) throws exception{        Thread T =new myThread ();        T.start ();        T.interrupt ();        System.out.println ("Mark");}    }

Output:

Mark

......

i=999

Join () method

Specific usage http://www.cnblogs.com/luyu1993/p/7017927.html

Here, look at its source code.

Public final synchronized void join (long Millis)     throws interruptedexception {    long base = System.currenttimemillis ();    Long now = 0;    if (Millis < 0) {            throw new IllegalArgumentException ("Timeout value is negative");    }    if (Millis = = 0) {        while (isAlive ()) {        Wait (0),        }    } else {while        (IsAlive ()) {        Long delay = mil Lis-now;        if (delay <= 0) {break            ;        }        Wait (delay);        now = System.currenttimemillis ()-Base;}}}    

　　

Join () calls the wait () Note that the thread must obtain a lock on the object before calling wait (), so the Wait () method can only be called in the synchronous method/synchronous code block . You can see that the join () method is synchronized, so no problem.

Look at the code below.

1 classMyThreadextendsthread{2 @Override3      Public voidrun () {4          for(inti = 0; i < 1000; i++) {5 System.out.println (i);6         }7     }8 }9  Public classWaittest {Ten  One      Public Static voidMain (string[] args)throwsexception{ AThread T =NewMyThread (); - T.start (); - Thread.CurrentThread (). Wait (); theSystem.out.println ("Mark"); -     } -  -}

At this time the program will error not calling the Wait () method in the synchronization method/synchronization code block!!!

Java Multithreading---Wait () & Join ()