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Collection Classes

How to use Iterators by FredrikN
Posted: 18 Apr 03

This is an simple example how you can use an Iterator with an Array

import java.util.*;


public class Driver
{

    public static void main(String[] in)
    {
        
        MinArray arr = new MinArray();
        
        arr.add("String1");
        arr.add("String2");
        arr.add("String3");            


        while(arr.hasNext())
        {    
            System.out.print(arr.next());
        }

         System.out.println();

    }


}


---------------------------------------------------

import java.util.*;

public class MinArray implements Iterator
{

    private Vector v;
    private int index = 0;

    MinArray()
    {

        v = new Vector();    

    }

    public void add(String in)
    {
        v.add(in);
    }


    public boolean hasNext()
    {
        return (index < v.size());
    }


    public Object next()
    {
        return v.get(index++);    
    }


    public void remove()
    {
        throw new UnsupportedOperationException("Error");
    }




}

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