JAVA - JPanel

 

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package tjpanel;

import javax.swing.*;

import java.awt.*;

public class TJPanel extends JApplet {

    Container container = null;

    

    public void init() {

        // 1. Get a reference to the applet's content pane and 

        // assigns a grid layout.

        container = getContentPane();

        container.setLayout(new GridLayout(2,1,2,2));

     

        // 2. Create four panels with grid layout and specified number

        // of rows and columns. The first two numbers in the 

        // GridLayout constructors are the number of rows and columns

        // The next two numbers represent the horizontal and vertical 

        // spacing between the components.

        JPanel panel1 = new JPanel(new GridLayout(1,3,2,2));

        JPanel panel2 = new JPanel(new GridLayout(1,2,2,2));

        JPanel panel3 = new JPanel(new GridLayout(2,1,2,2));

        JPanel panel4 = new JPanel(new GridLayout(1,2,2,2));

        

        // 3. Prepare panel1 with labels 1, 2, and 3.

        setLabel(panel1, "Label1");

        setLabel(panel1, "Label2");

        setLabel(panel1, "Label3");

        

        // 4. Prepare panel2 with labels 4 and 5.

        setLabel(panel2, "Label4");

        setLabel(panel2, "Label5");

        

        // 5. Prepare panel3 with labels 6 and 7.

        setLabel(panel3, "Label6");

        setLabel(panel3, "Label7");

        

        // 6. Add panel2 and panel3 to panel4.

        panel4.add(panel2);

        panel4.add(panel3);

        

        // 7. Finally, add panel1 and panel4 to the content pane.

        container.add(panel1);

        container.add(panel4);

       

    }

    

    // 8. Supporting method to create and attach a label.

    public void setLabel(Container panel, String text) {

        JLabel label = new JLabel(text, JLabel.CENTER);

        label.setOpaque(true);

        label.setForeground(Color.white);

        label.setBackground(Color.gray);

        panel.add(label);

    }

}