Java thread------------thread death, join

Java thread------------thread death, join

package java_thread;/* *  thread death status  *  causes thread death  * 1, run () or call () when the following 3 cases occur The method executes, the thread ends normally  * 2, the thread throws an uncaught exception or error * 3, and the thread's Stop () method is called directly to end the thread (note that the method is outdated, possibly or causes a deadlock)  */public class startdead extends thread {private int i = 0 ;/* *  thread Body  */@Overridepublic  void run ()  {for  (; i < 100;  i++)  {system.out.println (GetName ()  +  "  "  + i);}} Public static void main (String[] args)  {StartDead sd = new  Startdead ();for  (int i = 0; i < 300; i++)  {System.out.println ( Thread.CurrentThread (). GetName ()  +  " "  + i);if  (i == 20)  { Sd.start (); System.out.println (Sd.isalive ());} if  (I > 20 && !sd.isalive ())  {//must be the output falseSystem.out.println ( Sd.isalive ());* *  a Exception */// sd.start () is reported when attempting to start a thread that is already dead;}}} The join () method of the package java_thread;/* *  thread  * 1, Join () Method: A method that allows one thread to wait for another thread to complete  * 2, When another thread's join () method is called in a thread execution stream, the execution stream (such as main) is blocked and must wait until the other thread performs the play  */public class jointhread extends  Thread{public static JoinThread jt = null;/* *  provides a parameterized constructor to set the name   */public jointhread (string name)  {super (name);} /* *  rewrite the Run () method, define thread body  */@Overridepublic  void run ()  {for  (int i =  0; i < 100; i++)  {system.out.println (GetName ()  +  " "  +  i);}} Public static void main (String[] args)  throws Exception{/* *  start child thread  */jointhread a = new jointhread ("New Thread"); A.start ();//a.join (); Here too, the following program must wait for "new thread" Execution is performed to execute// main:1~19 with "new thread", the thread being join is randomly executed for  (int i = 0; i <  100; i++)  {if (i==20) {jt = new jointhread ("Thread of Join"); Jt.start ();/* * The  main thread calls the join () method of the JT thread  * main the thread must wait for the JT execution to finish before it executes  *///jt.join ();} /* *  so main:20~99 must be the last executed  */system.out.println (Thread.CurrentThread (). GetName ()  +  "    "+i);}}}

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Java thread------------thread death, join