Question about sorting arrays

Question

Hi,
I have posted information from an one-dimensional array on to a list widget. When a user selects an item in the list(index value = 3), presses the delete button, the item would be removed. Likewise, the element of the array at index value 3 would also be removed (or set to null?).
The trouble I am having is, how would you move up the elements that are subsequent to the element index value 3? For example, moving element index value 4 up to 3, 5 up to 4, 6 up to 5....etc.?
Here is my code:
public void delete()
list.delItem(list.getSelectedIndex());
student[list.getSelectedIndex()]=null;
Thanks alot!!

Answer 1

It's usually faster to use System.arraycopy() to close up the "hole" when removing something from an array: public void delete() {
    int index = list.getSelectedIndex() ;
    list.delItem(index) ;
    // if not removing last item... close up hole...
    if (index < (student.length-1)) {
        System.arraycopy(student, index+1, student, index, student.length - 1 - index) ;
    // clear out space made empty at end of array
    student[student.length-1] = null ; // or whatever represents 'empty' in your student[]