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Why we use extends JFrame in Java?
Why do we need to extend the JFrame class when building a Swing application. As far as I know extends is used for inheriting the base class. None of the functions of the JFrame class are used in the following program but still it is extended.
Why do we need JFrame?
The Java Swing JFrame class is the foundation for creating graphical Java applications. Without the frame, you can’t perform any interactions. When you create a new instance of the JFrame, you can pass a title to the constructor or simply create an empty frame.
What is extend JFrame in Java?
The usual way of writing a GUI is to define your own class by extending the JFrame class. The class myFrame extends the class JFrame . The paint() method of a JFrame object is called by the Java system (not by you) to finish the display. Most of the graphic is done; paint() just finishes it.
What is JFrame class in Java?
JFrame class is a type of container which inherits the java. awt. JFrame works like the main window where components like labels, buttons, textfields are added to create a GUI. Unlike Frame, JFrame has the option to hide or close the window with the help of setDefaultCloseOperation(int) method.
Is it OK to extend a JFrame in Java?
In other words – as long as the answer to the question is Test a JFrame? is NO, it should not extend JFrame. Avoid unintentional method overrides. I’ve stepped into this several times, first when I gave my class int getX () and int getY () methods.
Why do I use Eclipse instead of jframes?
Simplify the method options available when using Eclipse or NetBeans to only those methods you’ve created. This is actually my favorite advantage. Gearing your GUI’s to create JPanels rather than JFrames which increases deployment flexibility 100-fold. And most importantly, exposing only that which needs exposing.
When to extend a class in Java object oriented?
Your rule of “one should only extend a class if an IS-A relation is present” is incomplete. It should end with “…and we need to change the default behavior of the class” in big bold letters. Your examples do not fit that criteria.