Difference between JPanel JFrame JComponent and JApplet

Question

I m making a physics simulator for fun and I was looking up graphics tutorials when I tried to figure out the difference between all these J s   Can somebody elaborate on them or perhaps provide a link to a helpful source

User · Answer

JFrame and JApplet are top level containers. If you wish to create a desktop application, you will use JFrame and if you plan to host your application in browser you will use JApplet.

JComponent is an abstract class for all Swing components and you can use it as the base class for your new component. JPanel is a simple usable component you can use for almost anything.

Since this is for a fun project, the simplest way for you is to work with JPanel and then host it inside JFrame or JApplet. Netbeans has a visual designer for Swing with simple examples.

User · Answer

Those classes are common extension points for Java UI designs   First off  realize that they don t necessarily have much to do with each other directly  so trying to find a relationship between them might be counterproductive   JApplet - A base class that let s you write code that will run within the context of a browser  like for an interactive web page   This is cool and all but it brings limitations which is the price for it playing nice in the real world   Normally JApplet is used when you want to have your own UI in a web page   I ve always wondered why people don t take advantage of applets to store state for a session so no database or cookies are needed     JComponent - A base class for objects which intend to interact with Swing     JFrame - Used to represent the stuff a window should have  This includes borders  resizeable y n    titlebar  App name or other message   controls  minimize maximize allowed    and event handlers for various system events like  window close   permit app to exit yet     JPanel - Generic class used to gather other elements together  This is more important with working with the visual layout or one of the provided layout managers e g  gridbaglayout  etc   For example  you have a textbox that is bigger then the area you have reserved   Put the textbox in a scrolling pane and put that pane into a JPanel  Then when you place the JPanel  it will be more manageable in terms of layout

User · Answer

You might find it useful to lookup the classes on oracle  Eg   http   download oracle com javase 1 4 2 docs api javax swing JFrame html  There you can see that JFrame extends JComponent and JContainer   JComponent is a a basic object that can be drawn  JContainer extends this so that you can add components to it  JPanel and JFrame both extend JComponent as you can add things to them  JFrame provides a window  whereas JPanel is just a panel that goes inside a window  If that makes sense

[java] Difference between JPanel, JFrame, JComponent, and JApplet

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