2個線程執行2個類似職位

Question

我有2個職位我想在JAVA中執行。我有：

public static void main(String[] args) 
{ 
    takeInfofromDB(); 
    doSomeLongCalculationsWithThatData(); 

    takeInfofromDB2(); 
    doSomeLongCalculationsWithThatData2(); 

    GenerateAnswerFromBothAnswers(); 
} 

是否有可能以某種方式把takeInfofromDB();和doSomeLongCalculationsWithThatData();在2個線程？至少有一個仍在工作時，GenerateAnswerFromBothAnswers();無法執行？

Answer 1

就像這個...

public static void main(String[] args) 
{ 
    Thread t1 = new Thread(new Runnable() { 
     public void run() { 
      takeInfofromDB(); 
      doSomeLongCalculationsWithThatData(); 
     }}); 

    Thread t2 = new Thread(new Runnable() { 
     public void run() { 
     takeInfofromDB2(); 
     doSomeLongCalculationsWithThatData2(); 
     }}); 

    t1.start(); 
    t2.start(); 

    t1.join(); 
    t2.join(); 

    GenerateAnswerFromBothAnswers(); 
} 

Answer 2

對於一個非常簡單的輕量級方法，請嘗試下面的代碼。然而，你可能想了解更多有關線程，並最終執行者：http://docs.oracle.com/javase/tutorial/essential/concurrency/

Thread thread1 = new Thread() { 
    private Object result; 

    @Override 
    public void run() { 
     takeInfofromDB(); 
     result = doSomeLongCalculationsWithThatData(); 
    } 

    public Object getResult() { 
     return result; 
    } 
} 

Thread thread2 = new Thread() { 
    private Object result; 

    @Override 
    public void run() { 
     takeInfofromDB2(); 
     result = doSomeLongCalculationsWithThatData2(); 
    } 

    public Object getResult() { 
     return result; 
    } 
} 

thread1.start(); 
thread2.start(); 
thread1.join(); 
thread2.join(); 

Object result1 = thread1.getResult(); 
Object result2 = thread2.getResult(); 

GenerateAnswerFromBothAnswers(result1, result2); 

的是你不應該運行這段代碼（我沒有測試它，如果你join之前調用getResult可能發生奇怪的事情） ，但它應該成爲如何以基本方式使用線程的起點。