難以輸出字符串與返回的雙重

Question

下面是一個程序，我很難用返回的double值輸出字符串消息。任何幫助非常感謝，我不知道從哪裏去。我可能過度思考它或看到一個簡單的解決方案。謝謝！

預期輸出是：

average = 12.5 
average = 7.63 
average = 6.96 

但是我的程序輸出：

12.5 
7.63 
6.96 

這裏是我的代碼：

class Test2{ 
     public static void main(String[] args){ 
      int i, j; 
      double di, dj, dk; 
      i = 20; 
      j = 5; 
      Overload ol = new Overload(); 
      System.out.println(ol.findAverage(i, j)); 
      di = 14.29; 
      dj = 0.97; 
      System.out.println(ol.findAverage(di, dj)); 
      di = 3.51; 
      dj = 13.5; 
      dk = 3.87; 
      System.out.println(ol.findAverage(di, dj, dk)); 
     } 
    } 

    class Overload { 
     private int i, j; 
     private double di, dj, dk; 
     private double average; 

     public double findAverage(int i, int j) { 
      average = ((i + j)/2.0);  
      return average; 
     } 

     public double findAverage(double di, double dj) { 
      average = (di + dj)/2.0; 
      return average; 
     } 

     public double findAverage(double di, double dj, double dk) { 
      average = (di + dj + dk)/3.0; 
      return average; 
     } 

     public String findAverage() { 
      return "average = " + average; 
     } 
    } 

Answer 1

當你撥打：

System.out.println(ol.findAverage(i, j)); 

的背後，你在呼喚

public double findAverage(int i, int j) { 
     average = ((i + j)/2.0);  
     return average; 
    } 

此功能只返回雙重計算

如果你希望你的正確的輸出，只需做：

ol.findAverage(i, j); 
System.out.println(ol.findAverage());