Java enum list iterator issue

Question

package example;

import java.util.ArrayList;
import java.util.Iterator;

public class anaBolum {
    public static void main(String[] args) {
        ArrayList<IMeyveler> list = new ArrayList<>();
        list.add(new Muz());
        list.add(new Elma());

        Iterator it = list.iterator();
        while(it.hasNext()){
            it.next().fiyat() //compile error
        }
    }
}

I was use list.iterator() to access the list elements. But I can't access this method fiyat() in the iterator because I get compile error.

Too much of this question is in some local language. Try to internationalize it translating to English the names of methods and variables. — Boris Strandjev
– Boris Strandjev, Commented Dec 30, 2012 at 13:29
Also you should have precised that both Muz() and Elma() objects have the fiyat() method. — Smallware
– Smallware, Commented May 26, 2015 at 0:25

Arun P Johny · Accepted Answer · 2012-12-30 13:32:05Z

0

I assume you are getting some compile time error. If so You need to change the iterator declaration to Iterator<IMeyveler> it = list.iterator();

Other wise the iterator will not know the type of objects handled by it.

public class anaBolum {
    public static void main(String[] args) {
        IMeyveler muz = new Muz();
        muz.fiyat();// Work

        ArrayList<IMeyveler> list = new ArrayList<>();
        list.add(new Muz());
        list.add(new Elma());

        Iterator<IMeyveler> it = list.iterator();
        while(it.hasNext()){
            System.out.println(it.next().fiyat());
        }
    }
}

answered Dec 30, 2012 at 13:32

Arun P Johny

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Comments

vels4j · Accepted Answer · 2012-12-30 13:32:17Z

0

You need to do like this

    while(it.hasNext()){
        Object obj = it.next() ;
        if( obj instanceof Muz ) {
          Muz muz = (Muz) obj ;
          muz.fiyat();
        }
    }

answered Dec 30, 2012 at 13:32

vels4j

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Comments

cppanda · Accepted Answer · 2012-12-30 13:32:39Z

0

Your CodeCompletion does not show up, because .next() returns an object and not IMeyveler. You will either have to cast, or iterate differently.

    System.out.println(((IMeyveler)it.next()).fiyat());

answered Dec 30, 2012 at 13:32

cppanda

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vtokmak · Accepted Answer · 2012-12-30 14:02:43Z

0

Try this one:

package javaaa;

import java.util.ArrayList;
import java.util.Iterator;

public class anaBolum {
    public static void main(String[] args) {
        IMeyveler muz = new Muz();
        muz.fiyat();// Work

        ArrayList<IMeyveler> list = new ArrayList<>();
        list.add(new Muz());
        list.add(new Elma());

        for(IMeyveler fruit : list)
        {
            if(fruit instanceof Muz)
            {
                System.out.println(fruit.fiyat());
            }
        }  
    }
}

answered Dec 30, 2012 at 14:02

vtokmak

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