giving an arraylist the value of another arraylist JAVA

Question

I'm trying to do the following with Java, is this allowed?

import java.util.ArrayList;
class Apple {
    void makeAppleArrayList() {
        ArrayList<String> appleArrayList = new ArrayList<String>();
        appleArrayList.add("apple"); 
        Banana b = new Banana();
        b.copyAppleArrayList(appleArrayList);
    }
}

import java.util.ArrayList;
class Banana {
    ArrayList<String> bananaArrayList = new ArrayList<String>();
    void copyAppleArrayList(ArrayList<String> arrayList) {
        bananaArrayList = arrayList; 
    }
}

You should try it. Although Banana will just have a reference to Apple's ArrayList in your example. Once you fix your compiler error of course. Have you considered addAll? — Elliott Frisch
– Elliott Frisch, Commented Dec 12, 2013 at 2:48
no, i forgot about that, maybe i should try it, thanks for the tip — Abdul Ahmad
– Abdul Ahmad, Commented Dec 12, 2013 at 2:50

score 2 · Accepted Answer · 2013-12-12 03:31:00Z

2

Well instead of making an instance of banana in apple why dont you make an instance of apple in banana and just do this:

Apple apple = new Apple();
bananaArrayList = apple.appleArrayList;

So since it is created inside a function you initialize it in the constructor like so:

public class Apple{
public ArrayList<Perk> appleArrayList;

public PerkGenerator() {
        this.appleArrayList = new ArrayList();

And if you do that, there is no need to do it inside a function. But if you still want to do it inside a function. Just keep that code. And do this inside apple:

public ArrayList makeApple(){
    ArrayList apples = new ArrayList();
    return apples;

And then inside of banana you do this:

bananaArrayList = apple.makeApple

This works, because the make apple function returns an arraylist :) Here is some info on returning values from methods :) http://docs.oracle.com/javase/tutorial/java/javaOO/returnvalue.html

Hope i could help :)

edited Dec 12, 2013 at 3:31

answered Dec 12, 2013 at 2:50

user3011902

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7 Comments

user3011902 Over a year ago

:) Anytime Glad to help out

Abdul Ahmad Over a year ago

i just noticed, in apple, the applearraylist is declared within the method, can it still be called like you showed?

user3011902 Over a year ago

As long as you initialize it outside of that method in your constructor. Yes it certainly can. :)

Abdul Ahmad Over a year ago

so you mean i need to create a constructor and declare it in that? (sorry im kind of new to all this)

user3011902 Over a year ago

Thats ok :) Ill add it to my answer give me a second :)

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