Java Swing | JPanel with examples
JPanel, a part of Java Swing package, is a container that can store a group of components. The main task of JPanel is to organize components, various layouts can be set in JPanel which provide better organisation of components, however it does not have a title bar.
Constructor of JPanel are :
- JPanel() : creates a new panel with flow layout
- JPanel(LayoutManager l) : creates a new JPanel with specified layoutManager
- JPanel(boolean isDoubleBuffered) : creates a new JPanel with a specified buffering strategy
- JPanel(LayoutManager l, boolean isDoubleBuffered) : creates a new JPanel with specified layoutManager and a specified buffering strategy
Commonly used functions :
- add(Component c) : adds component to a specified container
- setLayout(LayoutManager l) : sets the layout of the container to specified layout manager
- updateUI() : resets the UI property with a value from the current look and feel.
- setUI(PanelUI ui) : sets the look and feel object that renders this component.
- getUI() : returns the look and feel object that renders this component.
- paramString() : returns a string representation of this JPanel.
- getUIClassID() : returns the name of the Look and feel class that renders this component.
- getAccessibleContext() : gets the AccessibleContext associated with this JPanel.
programs to illustrate use of JPanel
1. Program to create a simple JPanel add components to it
2. Program to create a JPanel with a Border layout and add components to it .
3. Program to create a JPanel with a Box layout and add components to it .
Note: In the previous Program, border layout and Box Layout are used. Different other layouts can be used to organize the components in a definite pattern, such as card layout, grid layout etc.
The above programs might not run in an online compiler please use an Offline IDE.
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