我想線程工作的順序創造，但我不能這樣做使用此代碼的建議，請

Question

我希望此代碼運行順序一二三，一二三等，但他們運行在隨機順序我嘗試過很多辦法，如設置優先級，但似乎沒有任何工作以隨機順序運行所有三個線程這不是我想要的輸出

class thrd extends Thread 
{ 
Thread t; 

thrd(String name) 
    { 
    t=new Thread(this,name); 
    System.out.println(name +":Created"+t); 
    } 

@Override 
public void run(){ 
    try 
    { 
     for(int i=1;i<=5;i++) 
     { 
      System.out.println(t.getName()+": "+i); 
      Thread.sleep(500); 
     } 
    } 
    catch(InterruptedException e) 
    { 
     System.out.println("Interrupted"+e); 
    } 
} 

} 

public class threadse { 

public static void main(String[] args) 
    { 
    thrd o1=new thrd("One"); 
    thrd o2=new thrd("Two"); 
    thrd o3=new thrd("Three"); 

    o1.t.start(); 
    o2.t.start(); 
    o3.t.start(); 

    System.out.println("Thread One alive: "+o1.t.isAlive()); 
    System.out.println("Thread Two alive: "+o2.t.isAlive()); 
    System.out.println("Thread Three alive: "+o3.t.isAlive()); 

     try 
     { 

     System.out.println("Waiting"); 
     o1.t.join(); 
     o2.t.join(); 
     o3.t.join(); 

     } 
    catch(InterruptedException e) 
     { 
     System.out.println("Interrupted: "+e); 
     } 

    System.out.println("Thread one alive: "+o1.t.isAlive()); 
    System.out.println("Thread Two alive: "+o2.t.isAlive()); 
    System.out.println("Thread Three alive: "+o3.t.isAlive()); 
    } 
} 

Answer 1

你只需要維持一個程序線程執行工作，使這項工作成爲關鍵部分。臨界區是幾行代碼上只有一個線程可以同時運行，但這裏你想嚴格序貫模式線程，這樣就只需要讓它確保::

在for循環只有那個線程執行輪到那裏使用sequenceCount變量。請參閱/ *註釋* /內部代碼以獲取更多說明。

class thrd extends Thread{  

    /* A sequence counter to make execution of threads sequentially */ 
    static int sequenceCount=0; 
    Thread t; 

    public thrd(String name){ 
     t=new Thread(this,name); 
     System.out.println(name+" Created"); 
    } 

    @Override 
    public void run(){ 
     try{ 

      for(int i=0;i<5;i++){ 
       /* Wait here if it is not current thread's turn */ 
       while(true){ 
        /* if it is 1st thread's turn and current thread is First Thread then break */ 
       if((sequenceCount==0)&&(t.getName().equals("One")))break; 
       /* In this way other threads will wait it it is not their turn */ 
       else if((sequenceCount==1)&&(t.getName().equals("Two")))break; 
       else if((sequenceCount==2)&&(t.getName().equals("Three")))break; 
      }  
      System.out.println(t.getName()+" : "+i); 
      Thread.sleep(500); 
      /* If it was last thread which printed out then move to 1st thread.. */ 
      if(sequenceCount==2)sequenceCount=0; 
      /* OtherWise make it turn of next Thread */ 
      else sequenceCount++; 
     } 

    }catch(Exception er){er.printStackTrace();} 
} 

} 

public class threadse { 

    public static void main(String[] args) 
    { 
    thrd o1=new thrd("One"); 
    thrd o2=new thrd("Two"); 
    thrd o3=new thrd("Three"); 

    o1.t.start(); 
    o2.t.start(); 
    o3.t.start(); 
    } 
}