Print an Attribute of an Object with Iterator in LinkedList - Java

Question

i wanted to print the A (getA()) of the Object Reiter with the iterator, but i don't seem to find anything that works. Could you help somehow please.

public static void main (String args[]){

    LinkedList<Reiter> reiter = new LinkedList<Reiter>();

    reiter.add(new Reiter(55));
    reiter.add(new Reiter(30));
    reiter.add(new Reiter(70));
    reiter.add(new Reiter(35));
    reiter.add(new Reiter(60));
    reiter.add(new Reiter(45));
    reiter.add(new Reiter(65));
    reiter.add(new Reiter(40));
    reiter.add(new Reiter(25));
    reiter.add(new Reiter(50));

    Iterator it = reiter.iterator();

    while(it.hasNext()){

        System.out.print(it.next());
    }

}

class Reiter{

    int a;
    public Reiter(int a){
         this.a = a;
    }
    public int getA(){
         return a;
}

rgettman · Accepted Answer · 2016-04-15 17:54:27Z

3

You are using the raw form of Iterator, which will return Objects. You can use the pre-Java 1.5 solution -- cast the returned object to a Reiter -- or you can use the generic form of Iterator, supplying Reiter as a type argument to Iterator.

Iterator<Reiter> it = reiter.iterator();

This will allow you to treat the returned object as a Reiter and call getA().

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

answered Apr 15, 2016 at 17:54

rgettman

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1 Comment

user6209116 Over a year ago

thanks, now it works. i didn't know that i can supply Reiter as a type argument.

Expired Data · Accepted Answer · 2016-04-15 17:53:38Z

1

In your while loop:

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

You need to print it.next().getA();

Simply printing the it.next() will print the object.

So the line should change to

System.out.print(it.next().getA());

answered Apr 15, 2016 at 17:53

Expired Data

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3 Comments

rgettman Over a year ago

A raw Iterator returns Objects, so the getA() method won't be available.

Expired Data Over a year ago

You're right I didn't pay attention to the lack of generics/casting

user6209116 Over a year ago

Still thanks, it helped a lot. Won't make that mistake again.

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