Make 2 classes share the same instance of an object in Java

Question

I was wondering if anyone could help me. I am stuck with something that seems simple. Say I initialize a Student object with the values of name, age and address in one class. How can I share THAT INSTANCE with another class, eg enable methods in the second class to make changes to the instance, thereby affecting the first class etc.

I was thinking of using JFrames where a new frame would popup and a button would affect values on the first frame.

Thank you

Take a look at [The Use of Multiple JFrames, Good/Bad Practice?](http://stackoverflow.com/questions/9554636/the-use-of-multiple-jframes-good-bad-practice) for some reasons why you shouldn't avoid multiple frames... — MadProgrammer, May 15 '14 at 00:09

score 1 · Answer 1 · answered May 15 '14 at 00:01

1

mutators can help you there. or, the singleton pattern, if you want to go "hard-knox". it's a pattern that allows only one single instance of a class in a jvm to exist.

just look at this

answered May 15 '14 at 00:01

Stultuske

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interesting nick name – mKorbel May 15 '14 at 09:40
indeed, same as on Daniweb :) – Stultuske May 15 '14 at 09:41

score 1 · Answer 2 · answered May 15 '14 at 00:01

in java if you pass reference of an object to a method and do any changes to that object property, it will change the actual object properties(call by reference)

also if you want to have only single object of a class that needs to be shared across other classes create a singleton pattern

Make 2 classes share the same instance of an object in Java

2 Answers2