ConcreteIterator.java

package com.cheng.bigtalkdesignpatterns.iterator;

import java.util.Vector;

/**
 * Created by Administrator on 2015/12/22.
 */
public class ConcreteIterator implements Iterator {

    private int currentIndex = 0;
    private Vector vector = null;

    public ConcreteIterator(final Vector _vector) {
        this.vector = _vector;
    }

    @Override
    public Object first() {
        currentIndex = 0;
        return vector.get(currentIndex);
    }

    @Override
    public Object next() {
        currentIndex++;
        return vector.get(currentIndex);
    }

    @Override
    public Object currentItem() {
        return vector.get(currentIndex);
    }

    @Override
    public boolean isDone() {
        if (currentIndex >= this.vector.size()-1) {
            return true;
        } else {
            return false;
        }
    }
}