Make a list with the last 100 added items

Question

Anybody knows how to have a List that only store the last 100 added items? A kind of a que which always has 100 items.
Thank you !
ostense

Answer 1

I am sure there is a simpler way to do what you are trying to do but ...
public class LastList extends LinkedList {
    private final int maxSize;
    public LastList(int maxSize) {
        this.maxSize = maxSize;
    public void addFirst(Object o) {
        super.addFirst(o);
        trim();
    public void addLast(Object o) {
        super.addLast(o);
        trim();
    public boolean add(Object o) {
        boolean ret = super.add(o);
        trim();
        return ret;
    public boolean addAll(Collection c) {
        boolean ret = super.addAll(c);
        trim();
        return ret;
    public boolean addAll(int index, Collection c) {
        boolean ret = super.addAll(index, c);
        trim();
        return ret;
    public void add(int index, Object element) {
        super.add(index, element);
        trim();
    private void trim() {
        while(size() > maxSize)
            removeFirst();
}