排序一個列表（降序）

Question

我怎樣才能排序這個列表（降序）？它增加了數字，但按升序排序，但我希望它下降（不使用任何外部庫或任何東西）。我試圖弄清楚，但沒有拿出任何東西。

private void addNewElement() 
{ 
//getting the input 
System.out.print("Please type the number to be added to the list: "); 

Integer newValue = null; 
while(newValue == null) 
{ 
    try 
    { 
     newValue = Integer.parseInt(userInput.nextLine()); 
    } 
    catch (final Exception e) 
    { 
     System.out.println("Wrong value. Please insert new value."); 
    } 
} 

//creating new element based on the input 
MyListElement newElement = new MyListElement(newValue); 

//if not first 
if (firstElement != null) 
{ 
    placeElementInList(newElement); 
} 
else 
{ 
    firstElement = newElement; //if first 
} 
} 

//if not first 
private void placeElementInList(final MyListElement newElement) 
{ 
//if smaller than first 
if (newElement.value < firstElement.value) 
{ 
    newElement.nextElement = firstElement; //new points to first 
    firstElement = newElement;    //and becomes first 
} 
else 
{ 
    MyListElement previousElement = firstElement; //have to remember previous element 
    MyListElement elementInList = firstElement.nextElement; //currently checked. 
    while (elementInList != null) 
    { 
     if (newElement.value < elementInList.value) //if new element is smaller that currently checked 
     { 
      break; //break - put it in current position. 
     } 
     previousElement = elementInList; //if not, move forward, substitute variables 
     elementInList = elementInList.nextElement; 
    } 
    previousElement.nextElement = newElement; //set the new element at the proper position 
    newElement.nextElement = elementInList; // 
} 

}

Answer 1

有它降序排序，只需翻轉你所有的比較，從運營商到<>，例如

if (newElement.value > firstElement.value)