Exemplu Interfata Iterator

Exemplu-Iterator.java

import java.util.Iterator;
import java.util.NoSuchElementException;

public class Main implements Iterator<Integer> {
    private int[] data;
    private int index = 0;

    public Main(int[] data) {
        this.data = data;
    }

    @Override
    public boolean hasNext() {
        return index < data.length;
    }

    @Override
    public Integer next() {
        if (!hasNext()) {
            throw new NoSuchElementException("No more elements");
        }
        return data[index++];
    }

    @Override
    public void remove() {
        throw new UnsupportedOperationException("remove not supported");
    }

    public static void main(String[] args) {
        int[] numbers = {10, 20, 30, 40};
        Main it = new Main(numbers);

        while (it.hasNext()) {
            System.out.println(it.next());
        }
    }
}