JList Sorting

Hello All,

Can you please guide me how can I sort the contents of a JList? I am using the DefaultListModel. Items will be added to the JList dynamically like this :

Class c1= new Class (parameter1,parameter2, parameter3);
listModel.addElement(c1);

Now I would like to sort it like (parameter2,parameter1,parameter3)

Can you please guide me?


Thanks all in advance.

If you are adding an Object with 3 values to the list, then you should be using a JTable, not a JList. A JTable is designed to display multiple columns. A JList is designed to display only a single column. JTable provides built in support for sorting.

In this reply I assume that "sort it like (parameter2,parameter1,parameter3)"
means to reorder the elements of the model in some way.
No matter how you want to define the ordering, you only need to write a method
to compare two elements and decide which should come before the other.

First you make the Class have the Comparable interface
and define the comparison method:

Code:

---

class Class implements Comparable<Class> {
    ...
    // the compareTo method is defined by the Comparable interface
    int compareTo(Class o) {
        if (  [I][COLOR="DarkOrchid"]this comes before o[/COLOR][/I]  ) return -1;
        else if (  [COLOR="DarkOrchid"]this comes after o[/COLOR]    ) return +1;
        return 0;  // it is best if this case only happens when this == o
    }
    ...
}  // end class Class

---

Then actual sorting can be done with a method like this

Code:

---

static void sort(DefaultListModel dlm) {
    Class [] dlma = dlm.toArray();    // make an array of the elements in the model
    Arrays.sort(dlma);  // sort the array (this step uses the compareTo method)
    dlm.clear();    // empty the model
    for (Class x : dlma)
        dlm.add(x);      // insert all the elements into the model in sorted order
}

---