Java多線程等待線程完成

Question

試圖編寫一個多線程的Java程序，但遇到一些問題，我的主要多線程類可以正常工作，但如果我從main調用它啓動所有線程並移動到下一個函數，我需要它不動，直到完成所有線程。讀被傳遞文件路徑讀取（字符串，字符串）

  Thread one = new Thread(new Runnable() { 
       public void run() 
       { 
        System.out.println("Starting thread 1"); 
        read(expiredOneYear, master1); 
        System.out.println("Finished thread 1"); 
       } 
      }); 

      Thread two = new Thread(new Runnable() { 
       public void run() 
       { 
        System.out.println("Starting thread 2"); 
        read(expiredOneAndQuarterYear, master2); 
        System.out.println("Finished thread 2"); 
       } 
      }); 

      Thread three = new Thread(new Runnable() { 
       public void run() 
       { 
        System.out.println("Starting thread 3"); 
        read(expiredOneAndHalfYear , master3); 
        System.out.println("Finished thread 3"); 
       } 
      }); 

      Thread four = new Thread(new Runnable() { 
       public void run() 
       { 
        System.out.println("Starting thread 4"); 
        read(expiredOneAnd3QuarterYear , master4); 
        System.out.println("Finished thread 4"); 
       } 
      }); 

      // start threads 
      one.start(); 
      two.start(); 
      three.start(); 
      four.start(); 

下面

是主要

CSVcompare.run(threadCount, mode, fileLocation); 
CSVpattern.run(fileLocation); 

發生什麼事，我不想CSVpattern.run（）開始在CSVcompare.run直到所有線程（）已完成，否則將不會有某些數據準備好用於CSVpattern.run（）

Answer 1

在運行結束時將呼叫添加到join()。 join()方法等待線程完成。

try 
{ 
    one.join(); 
    two.join(); 
    three.join(); 
    four.join(); 
} 
catch (InterruptedException e) 
{ 
    System.out.println("Interrupt Occurred"); 
    e.printStackTrace(); 
} 

如果你想忽略中斷（可能至少應該弄清楚它爲什麼被中斷，但是這將工作）

boolean done = false; 
while (!done) 
{ 
    try 
    { 
     one.join(); 
     two.join(); 
     three.join(); 
     four.join(); 
     done = true; 
    } 
    catch (InterruptedException e) 
    { 
     // Handle interrupt determine if need to exit. 
    } 
} 

https://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html#join()