How to sort JList of element while new item is added to its DefaultListModel

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I have

Java

JList<myElement> list

which has

Java

listmodel listModel = new DefaultListModel<myElement>()

as its data model. I add my element to listModel dynamically. I want to put each element in alphabetical order when is added to listModel (so my listModel is always sorted!)regarding to what their toString() method is return.

I have try following code, but it remove all the element and add them in alphabetical order.

Java

public void sortList(){
    myElement temp;
    myElement[] ob = new myElement[listModel.getSize()];
    for(int i = 0 ; i <listModel.getSize(); i++ )
        ob[i] = listModel.getElementAt(i);
    int n=ob.length;
    for(int i=0;i<n;i++)
        for(int j=0;j<n-i-1;j++)
        {
            if(ob[j].toString().compareTo(ob[j+1].toString())>0) // used to sort strings
            {
             temp=ob[j];
             ob[j]=ob[j+1];
             ob[j+1]=temp;
            }

          }
    listModel.removeAllElements();
    for(int i=0;i<n;i++)
      listModel.addElement((myElement) ob[i]);
    System.out.println("sort!");

}

also I represent them with jLabel!

Posted 5-Aug-14 22:09pm

Coder93

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TorstenH. · Answer 1 · 2014-08-05T22:26:00

Solution 1

Java

Collection list = Collections.list(listModel.elements()); // get a collection of the elements in the model
Collections.sort(list); // sort
listModel.clear(); // remove all elements
for(Object o:list){ listModel.addElement(o); } // add elements

something like that.
You can also extract an Array and sort it via a Comparator[^].

JList should update view automatically.

Have fun!

Posted 5-Aug-14 22:26pm

TorstenH.

Comments

Coder93 6-Aug-14 5:01am

I don't want to clear listmodel element when new element is added. I want to add each element in its rigth place!

TorstenH. 6-Aug-14 9:54am

therefor you need to take the elements, create a list of that, sort them, and put them back to where they belong.

There is no way around.

You might use another workaround: Creating a Sorted Component @oracle.com