[Java swing] JTabbenPane in Java

If you use notepad++ or eclipse or netbean to code java, you will see they have multiple tab. This article will help you do it via learn JTabbedPane.

Let see the code below to make a simple demo same as the photo. In the code, I have clearly explained. In this code, I will say a bit more about JTabbPane.

package nguyenvanquan7826.JTabbedPane;
 
import java.awt.Color;
import java.awt.GridLayout;
 
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTextArea;
 
/**
 * ----------------- @author nguyenvanquan7826 -----------------
 * ---------------nguyenvanquan7826.wordpress.com --------------
 */
public class DemoJTabbedPane extends JFrame {
 
    public DemoJTabbedPane() {
        createGUI();
        setDisplay();
    }
 
    /**
     * set display for JFrame
     */
    private void setDisplay() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
        setLocationRelativeTo(null);
        setVisible(true);
    }
 
    /**
     * add JTabbedPane into JFrame
     */
    private void createGUI() {
        add(createTabbedPane());
    }
 
    /**
     * create a JTabbedPane contain three tab
     */
    private JTabbedPane createTabbedPane() {
        JTabbedPane tabbedPane = new JTabbedPane();
 
        /* create three JPanel, which is content of tabs */
        JPanel panel1 = createPane1();
        JPanel panel2 = createJPanel("content of panel 2");
        JPanel panel3 = createJPanel("content of panel 3");
 
        /* add three tab with three JPanel */
        tabbedPane.addTab("Tab 1", null, panel1, "click to show panel 1");
        tabbedPane.addTab("Tab 2", null, panel2, "click to show panel 2");
        tabbedPane.addTab("Tab 3", null, panel3, "click to show panel 3");
 
        return tabbedPane;
    }
 
    /**
     * create JPanel 1 contain a JTextArea
     */
    private JPanel createPane1() {
        JPanel panel = new JPanel();
        panel.add(new JScrollPane(createTextArea(10, 40)));
        return panel;
    }
 
    /**
     * create a JPanel contain a JLabel
     */
    private JPanel createJPanel(String text) {
        JPanel panel = new JPanel(new GridLayout(1, 1));
        JLabel lb = new JLabel(text);
        lb.setHorizontalAlignment(JLabel.CENTER);
        panel.add(lb);
        return panel;
    }
 
    /**
     * create a JTextArea with rows and columns, two method setWrapStyleWord and
     * setLineWrap make text can down line when text too long
     */
    private JTextArea createTextArea(int row, int col) {
        JTextArea ta = new JTextArea(row, col);
        ta.setWrapStyleWord(true);
        ta.setLineWrap(true);
        ta.setForeground(Color.BLUE);
        return ta;
    }
 
    public static void main(String[] args) {
        new DemoJTabbedPane();
    }
}

Almost method of JLabel, JPanel, JTextArea,… I have mentioned in previous articles. You need to pay attention constructor method. We have some method:

JTabbedPane(): Create an empty JTabbenPane with a default tab placement of TOP.
JTabbedPane(int tabPlacement): Create an empty JTabbenPane with the specified tab placement: JTabbedPane.TOP if tab on top,JTabbedPane.BOTTOM if tab on bottom, JTabbedPane.LEFT if tab on left, JTabbedPane.RIGHT if tab on right.
JTabbedPane(int tabPlacement, int tabLayoutPolicy): Creates an empty TabbedPane with the specified tab placement and tab layout policy.

When created JTabbenPane, we add components to create tabs. Each Tab contain a JPanel have certain content. Method addTab has arguments is: name tab, icon tab, component of tab and tool tip text.

Read more: class JTabbedPane, use JTabbedPane, Java swing
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