UniqueList.java Source code

Introduction

Here is the source code for UniqueList.java

Source

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;

class UniqueList {
    private HashSet masterSet = new HashSet();
    private ArrayList innerList;
    private Object[] returnable;

    public UniqueList() {
        innerList = new ArrayList();
    }

    public UniqueList(int size) {
        innerList = new ArrayList(size);
    }

    public void add(Object thing) {
        if (!masterSet.contains(thing)) {
            masterSet.add(thing);
            innerList.add(thing);
        }
    }

    public List getList() {
        return innerList;
    }

    public Object get(int index) {
        return innerList.get(index);
    }

    public Object[] toObjectArray() {
        int size = innerList.size();
        returnable = new Object[size];
        for (int i = 0; i < size; i++) {
            returnable[i] = innerList.get(i);
        }
        return returnable;
    }
}

public class Main {
    public static void main(String[] args) {
        UniqueList ul = new UniqueList();
        ul.add("Test");
        ul.add("Test");
        ul.add("Not a copy");
        ul.add("Test");
        Object[] content = ul.toObjectArray();
        System.out.println(Arrays.toString(content));
    }
}