JPanel Example
This JPanel example shows two JPanels. JPanel is a subclass of JComponent and therefore instances of it can be added into a container such as a JFrame's content pane. JComponent is a subclass of Container and therefore a JPanel is also a container and can be added into.
In this example labels are added into two different JPanels which are then added into the frame's content pane. The design of a complex user interface can be eased by the use of JPanels, each of which may take advantage of different layout managers, as shown here.
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// JPanel Example
import java.awt.*;
import javax.swing.*;
class JPanelExample {
public static void main(String[] args) {
JPanel jpanel_0 = new JPanel();
jpanel_0.setBackground(Color.pink);
for(int i=0;i<3;++i) jpanel_0.add(new JLabel("label"+i));
JPanel jpanel_1 = new JPanel(new GridLayout(0,1));
jpanel_1.setBackground(Color.cyan);
for(int i=0;i<7;++i) jpanel_1.add(new JLabel(" label"+i+" "));
JFrame frame = new JFrame();
Container cp = frame.getContentPane();
cp.add(jpanel_0,BorderLayout.WEST);
cp.add(jpanel_1,BorderLayout.EAST);
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
9-10 This construction of a pink JPanel gets the default layout manager FlowLayout.
13-14 This construction of a cyan JPanel gets a GridLayout layout manager, with one column and any number of rows.