Common questions

What is use of container getContentPane?

author 0

What is use of container getContentPane?

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.

What package is JFrame in Java?

javax.swing package
JFrame is a class of the javax. swing package that is extended by java. awt. frame.

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 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 EDT in Swing?

The event dispatching thread (EDT) is a background thread used in Java to process events from the Abstract Window Toolkit (AWT) graphical user interface event queue. Updating visible components from other threads is the source of many common bugs in Java programs that use Swing.

How do I display a JFrame?

The JFrame class has two methods that you call to display a JFrame instance, pack and setVisible. The pack method resizes the JFrame to fit the sizes and layout of its child components. You can invoke setVisible (true) to display the JFrame.

What should I import for JFrame?

JFrame Example

  • import java.awt.FlowLayout;
  • import javax.swing.JButton;
  • import javax.swing.JFrame;
  • import javax.swing.JLabel;
  • import javax.swing.JPanel;
  • public class JFrameExample {
  • public static void main(String s[]) {
  • JFrame frame = new JFrame(“JFrame Example”);

What are frames Java?

A frame, implemented as an instance of the JFrame class, is a window that has decorations such as a border, a title, and supports button components that close or iconify the window. Applications with a GUI usually include at least one frame.

Is JPanel a container?

JFrame = a heavy weight container used as the top-level window. JPanel = a light weight container used to organize GUI components.

What is the ultimate top-level container one uses in a Swing GUI?

Top-level containers A top-level container is a swing component with one only purpose, and that is to hold other swing components (with lower status). In Swing there are four top-level containers, but only three from those are used. They are JFrame, JApplet and JDialog.

How to get the content pane of a JFrame in JFrame?

Container c = frame.getContentPane (); } } If you we extend JFrame then we can use getContentPane () method direct in our BoxLayout object . But if we apply association rule (means we create an Object of JFrame in our code i.e. JFrame f=new JFrame () ), then we need to create a Container object and pass this object in BoxLayout () as an argument.

How to add an object to the contentpane of a container?

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.

What is the difference between JFrame and jrootpane?

Like all other JFC/Swing top-level containers, a JFrame contains a JRootPane as its only child. The content pane provided by the root pane should, as a rule, contain all the non-menu components displayed by the JFrame . This is different from the AWT Frame case.

What is getcontentpane() method in Java?

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. You do not have to know the name of the content pane to use it.

author

Back to Top