What is a Contentpane?
A Content Pane is the most basic layout tile. Conceptually, it’s like the content boxes in portals like MyYahoo. A content pane resembles an iframe, but contains extra design features, fits in with the current theme, and renders widgets properly.
What is containment hierarchy?
A containment hierarchy is a tree of components that has a top-level container as its root. We’ll show you one in a bit. Each GUI component can be contained only once.
What is use of Contentpane in Java?
In Java Swing, the layer that is used to hold objects is called the content pane. Objects are added to the content pane layer of the container. The getContentPane() method retrieves the content pane layer so that you can add an object to it. The content pane is an object created by the Java run time environment.
Can a JPanel contain another JPanel?
A JPanel can contain other components, and it can in turn be contained in another component. The fact that panels can contain other panels means that you can have many levels of components containing other components, as shown in the illustration on the right.
Why do we use JPanel in Java?
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.
Where is JPanel?
The JPanel class resides in the package javax. swing and it’s a subclass of the javax. swing.
What are the top level containers in Swing?
As we mentioned before, Swing provides three generally useful top-level container classes: JFrame , JDialog , and JApplet . When using these classes, you should keep these facts in mind: To appear onscreen, every GUI component must be part of a containment hierarchy.
What is the relation between contentpane and jpanel?
getContentPane () returns a Container object. This isn’t really a plain Container object, but is actually a JPanel! This is a Container as a consequence of the hierarchy. So if we get the predefined content pane, it turns out it’s actually a JPanel, but we really can’t take advantage of the functionality that was added by JComponent.
What do you mean by content pane in Java?
ContentPane (or Content Pain?) JFrames have a content pane, which holds the components. These components are sized and positioned by the layout manager when JFrame’s pack () is called. Content pane border.
Which is the default layout manager for jpanel?
Each JPanel object is initialized to use a FlowLayout, unless you specify differently when creating the JPanel. Content panes use BorderLayout by default. If you do not like the default layout manager that a panel or content pane uses, you are free to change it to a different one.
What does the content pane do in JFrame?
JFrames have a content pane, which holds the components. These components are sized and positioned by the layout manager when JFrame’s pack() is called. Content pane border. There are several ways to handle the content pane, but most of them fail to provide one basic requirement — ability to set a border.