Home/ Questions/Q 7063609
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-28T04:44:01+00:00

In my college days, I never realized what patterns were there in the Java

  • 0

In my college days, I never realized what patterns were there in the Java API.
Now at work I came across Delegation pattern in Objective C n Cocoa on iOS where one screen sets itself as a delegate on coming screen so that that screen can pass some message to that delegate and it can take some action when it comes back to the previous screen.

I realize that I use to do something similar with when I used to pass “this” as as ActionListener [by implementing the interface] to a JButton and it would automatically call actionPerformed implemented by me in this class and thus I could change any instance data in my JFrame class.

So Is ActionListener an example of Delegate If I am correct ?

EDIT: As correctly mentioned below, It is Observer pattern. We dont set ActionListener we add one. Thus there can be many Listeners to that action.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    ActionListener is an example of the observer pattern. You register observers (or listeners) on a component that get called when a specific event occurs.

    • 0