Java Community | Help. Code. Learn.•7d ago

Anonymous Classes

Hey guys, is anyone able to explain quickly an example of why you’d need to use an anonymous class?

11 Replies

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dan1st•7d ago

basically whenever you want a simple implementation for something that you only need in one place and don't want to put it in another file For example if you want to add a listener somewhere and that listener has two methods, you could do something along the lines of

mouseHandler.addMouseListener(new MouseListener(){
  @Override
  public void onMouseClick(MouseClickEvent event){
    System.out.println("click");
  }
  @Override
  public void onMouseRightClick(MouseClickEvent event){
    System.out.println("clack");
  }
});

mouseHandler.addMouseListener(new MouseListener(){
  @Override
  public void onMouseClick(MouseClickEvent event){
    System.out.println("click");
  }
  @Override
  public void onMouseRightClick(MouseClickEvent event){
    System.out.println("clack");
  }
});

You should always aim for your code to be readable and if it's more readable if it is in the same file, that's an option

JavaBot•7d ago

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valerOP•6d ago

Ok so its something that would only be in in the scope of one method correct?

valerOP•6d ago

Also, is this video a good representation of how anonymous classes work? https://www.youtube.com/watch?v=P_iOnmdww8E&t=81s

Bro Code

YouTube

Learn Java ANONYMOUS CLASSES in 5 minutes! 🕵️‍♂️

#java #javatutorial #javacourse public class Main { public static void main(String[] args) { // Anonymous class = A class that doesn't have a name. Cannot be reused. // Add custom behavior without having to create a new class. // Often used for...

dan1st•6d ago

if you only need it for assigning a single variable

dan1st•6d ago

I can't watch the video rn but you muäight want to check https://dev.java/learn/classes-objects/design-best-practices/

Dev.java: The Destination for Java Developers

When to Use Nested Classes, Local Classes, Anonymous Classes, and L...

When to Use Nested Classes, Local Classes, Anonymous Classes, and Lambda Expressions.

dan1st•6d ago

and https://dev.java/learn/classes-objects/nested-classes/ has a section about these as well

Dev.java: The Destination for Java Developers

Nested Classes - Dev.java

Defining a class within another class.

valerOP•6d ago

Hmm lets see

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