在java中运行JTabbedPanel on for loop

Question

嗨，我尝试使用 for 循环运行 JTabbedPanel。我的程序运行成功。但它没有像我期望的那样创建任何 Tab 文件。请帮助我。

public void GenerateGUI() {
    jPanel = new JPanel[3];
    jSplitPane1 = new JSplitPane();
    jTabbedPane1 = new JTabbedPane();
    GroupLayout[] jPanelLayout = new GroupLayout[3];
    for (int i = 0; i <= noOfTerminals; i++) {
        jPanel[i] = new JPanel();
        jPanelLayout[i] = new GroupLayout(jPanel[i]);
        jPanel[i].setLayout(jPanelLayout[i]);
        jPanelLayout[i].setHorizontalGroup(jPanelLayout[i]
                .createParallelGroup(
                        javax.swing.GroupLayout.Alignment.LEADING).addGap(
                        0, 449, Short.MAX_VALUE));
        jPanelLayout[i].setVerticalGroup(jPanelLayout[i]
                .createParallelGroup(
                        javax.swing.GroupLayout.Alignment.LEADING).addGap(
                        0, 250, Short.MAX_VALUE));
        jPanel[i].add(lblOverView);
        jTabbedPane1.addTab("OverView", jPanel[i]);
    }
    setLayout(null);
    add(jTabbedPane1);
    setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
    pack();
    setVisible(true);
    setLocationRelativeTo(null);
}

Answer 1

发生这种情况是因为您使用null LayoutManager .因此，setLayout(null);删除该行，所有行都将正常工作，或将该行更改为非空值，例如：

setLayout(new BorderLayout()); .

我建议您不要使用空布局。检查LayoutManager教程。例如尝试BorderLayout或其他。

Answer 2

    public GenerateGUI() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 450, 300);
    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    setContentPane(contentPane);
    contentPane.setLayout(null);
    JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.TOP);
    tabbedPane.setBounds(10, 11, 414, 240);
    contentPane.add(tabbedPane);
    JPanel[] panels = new JPanel[3];
    for (int i = 0; i < 3; i++){
        panels[i] = new JPanel();
        panels[i].setVisible(true);
        tabbedPane.addTab("Tab " + Integer.toString(i), null, panels[i], null);
    }
}

使用 JFrame 扩展您的课程。