javax.swing is a package library in Java that provides components and utilities for graphical user interface (GUI) development. JComponent is a class in javax.swing that extends the basic functionality of the AWT component class. JComponent includes additional methods for painting and event handling.
revalidate() is a method in JComponent that is used to signal the container that the layout needs to be recalculated. This method is called when a change is made to the component that affects its layout, such as adding or removing components. It invalidates the layout and schedules a layout recalculating pass on the next paint cycle.
Example 1:
JPanel panel = new JPanel(); JButton button = new JButton("Click me"); panel.add(button); panel.revalidate();
In this example, we create a JPanel and a JButton, add the button to the panel, then call revalidate() on the panel to recalculate the layout.
Example 2:
JTextField textField = new JTextField("Enter text", 20); JLabel label = new JLabel("Name:"); JPanel panel = new JPanel(new FlowLayout()); panel.add(label); panel.add(textField); panel.revalidate();
In this example, we create a JTextField and a JLabel, add them to a JPanel using a FlowLayout, then call revalidate() on the panel to recalculate the layout.
Package Library: javax.swing.
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