Java multi-threading simulation exercises young and old climbing

| - demand explanation

 

| - realization of ideas

 

| - Content Code

. 1  Package cn.thread2;
 2  
. 3  / ** 
. 4  * 9527 :: @auther
 . 5  * @Description: climbing
 . 6  * @program: shi_yong
 . 7  * @Create: 2019-08-05 15:41
 . 8   * / 
. 9  public  class Hiking the implements the Runnable {
 10      // set two properties used to initialize the data 
. 11      Private  int Time;
 12 is      Private  int NUM;
 13 is  
14      public Hiking ( int Time, int NUM) {
 15          the this .time = time;
16         this.num = num;
17     }
18 
19     public Hiking() {
20     }
21 
22     public int getTime() {
23         return time;
24     }
25 
26     public void setTime(int time) {
27         this.time = time;
28     }
29 
30     public int getNum() {
31         return num;
32     }
33 
34     public  void setNum ( int NUM) {
 35          the this .num = NUM;
 36      }
 37 [  
38 is      @Override
 39      public  void () {RUN
 40          // Causes num -1 is the cycle of the program termination condition is zero, so the actual number of cycles is +. 1 NUM 
41 is          for ( int I =-NUM. 1; I> = 0; i-- ) {
 42 is              the Thread T = Thread.currentThread ();
 43 is  
44 is              // set loop terminates if the termination condition ----, it out this method 
45              IF (I == 0 ) {
 46 is                  System.out.println (t.getName () + "has reached the end of");
 47                  return ;
 48              }
 49              // request output message 
50              System.out.println (t.getName () + "climbed the first" + (num - i) + " th 100 m" );
 51 is              the try {
 52                  // set simulated climbing sleep unit time takes a little longer it takes the elderly, young takes shorter 
53 is                  the Thread.sleep (time);
 54 is              } the catch (InterruptedException E) {
 55                  e.printStackTrace ();
 56 is              }
 57 is  
58          }
 59      }
 60  
61 is }

Thread class - for rewriting the original data structure and the run method

. 1  Package cn.thread2;
 2  
. 3  / ** 
. 4  * 9527 :: @auther
 . 5  * @Description: test class
 . 6  * @program: shi_yong
 . 7  * @Create: 2019-08-05 15:52
 . 8   * / 
. 9  public  class {the Test
 10      public  static  void main (String [] args) {
 . 11          // passaged by reference constructor, a 100 m young climbed 50 ms, 100 ms elderly climbed a 100 m
 12          // total climb 5 100 m 
13 is          Hiking Old = new new Hiking (100, 5 );
 14          Hiking = Young new new Hiking (50,5);
 15          // provided a elderly 
16          the Thread Oldman = new new the Thread (Old, "elderly" );
 17          // provided a young 
18 is          the Thread YOUNGMAN = new new the Thread (Young, "young" );
 . 19          oldMan.start ();
 20 is          youngMan.start ();
 21 is      }
 22 is }

Program entry --- create a thread

 

| - operating results

 

| - problems in the process of

Running time, we found the problem illustrated below, there is no display has reached the end **

If found by investigation of conditions for loop and is not bound to the for loop, resulting in the body if the method is not performed, as illustrated, the termination condition of i is 1, if the determination condition is i == 0; i = So method body = 0 will not be executed

 

After i> 0, is changed to i> = 0, the program running