Assigning objects with dynamic names in Java

Question

I am trying to create an object of a class with dynamic naming

Object1
Object2
Object3

So, I am trying to create a dynamic name for an object of the class Adder.

Adder addar[];

and I am trying to store that object in the ArrayList.

ArrayList<Adder> list= new ArrayList<Adder>();

Inside a printer method I have used below code.

addar[count] = new Adder();
addar[count].addName(theName);
addar[count].addAge(theAge);
list.add(addar[count]);

When I try to run the program i get this exception

Exception in thread "main" java.lang.NullPointerException<br/>
  at Moving.printer(Moving.java:65)
  at OrPGan.main(OrPGan.java:7)

at line

addar[count] = new Adder();

What is causing this? How can I deal with this?

Your response would be greatly appreciated.

where have u intialized Adder addar[]; ?? – Juned Ahsan Oct 08 '15 at 05:40 — Juned Ahsan, Oct 08 '15 at 05:40
Please review the answer given below, thanks. – Tim Biegeleisen Oct 08 '15 at 05:45 — Tim Biegeleisen, Oct 08 '15 at 05:45

score 0 · Accepted Answer · answered Oct 08 '15 at 05:42

0

You need to initialize the array of Adder objects in addition to initializing each individual Adder member of that array. Try this code:

Adder addar[] = new Adder[10];
ArrayList<Adder> list= new ArrayList<Adder>();

int count = 0;

addar[count] = new Adder();
addar[count].addName(theName);
addar[count].addAge(theAge);
list.add(addar[count]);

answered Oct 08 '15 at 05:42

Tim Biegeleisen

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Thank you! Your solution solved my problem – PickleR Oct 08 '15 at 05:57

Assigning objects with dynamic names in Java

1 Answers1