在Java中切換對象數組中的最小值和最大值

Question

我被要求在Java中切換對象數組中的最大值和最小值。我寫了我的代碼，這似乎是合理的，但由於某些原因，值不切換？我不太清楚我的代碼有什麼問題，有人能指出我的方向嗎？謝謝！！

這是我的代碼：

public class Measurables 
{ 
    /** 
     Swaps the values with the smallest and largest measure. 
     @param objects an array of objects of a class that implements the 
     Measurable interface. 
    */ 
    public static void swapMinAndMax(Measurable[] objects) 
    { 

     Measurable largest = objects[0]; 
     Measurable smallest = largest; 
     for (int i = 1 ; i < objects.length ; i++) 
     { 
     Measurable current = objects[i]; 
     if (largest.getMeasure() < current.getMeasure()) 
     { 
      largest = current; 
     } 
     if (smallest.getMeasure() < current.getMeasure()) 
     { 
      smallest = current; 
     } 
     Measurable temp = largest; 
     largest = smallest; 
     smallest = temp; 

     } 
     } 
} 

這是我所得到的，當我運行測試儀：

Testers 

Running Tester.java 

fail 
[Uruguay, Thailand, Belgium] 
Expected: [Uruguay, Belgium, Thailand] 
Running Tester2.java 

fail 
[BankAccount[balance=1000.0], BankAccount[balance=3000.0], BankAccount[balance=2000.0]] 
Expected: [BankAccount[balance=3000.0], BankAccount[balance=1000.0], BankAccount[balance=2000.0]] 
Running Tester3.java 

pass 
[Uruguay] 
Expected: [Uruguay] 

Answer 1

可以儲存您的元素的索引，以便您可以執行在之後交換您確定最小和最大的指數。另外，你似乎已經將最小值換成了對比值。類似的，

public static void swapMinAndMax(Measurable[] objects) { 
    int largest = 0, smallest = 0; 
    for (int i = 1; i < objects.length; i++) { 
     Measurable current = objects[i]; 
     if (objects[largest].getMeasure() < current.getMeasure()) { 
      largest = i; 
     } 
     if (objects[smallest].getMeasure() > current.getMeasure()) { 
      smallest = i; 
     } 
    } 
    // Now swap, we know the indexes. 
    Measurable temp = objects[largest]; 
    objects[largest] = objects[smallest]; 
    objects[smallest] = temp; 
}