Swing:在框架中放置一组组件

Question

准确而简短:
是否可以使用一组组件(如复选框、单选按钮等)来布局框架容器，而不是将它们一个一个地添加到框架中？因此，将它们放置在框架中会容易得多。

private void initializaUI(){
    setSize(700, 600);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    //Panel container to wrap checkboxes and radio buttons
    JPanel panel = new JPanel(null);
    JPanel checkBoxPanel = new JPanel(new BoxLayout(panel, defaultCloseOperation, null));
    JPanel radioPanel_1 = new JPanel(new GridLayout());
    JPanel radioPanel_2 = new JPanel(new GridLayout());

    //Text field to display order
    JTextField orderField = new JTextField(20);
    orderField.setBounds(100, 100, 100, 20);

    //Button to process place the order
    JButton button = new JButton("Process Selection");
    button.setBounds(300, 100, 100, 40);

    //toppings check boxes
    checkBoxPanel.setVisible(true);
    checkBoxPanel.setBounds(100, 200, 100, 50);
    String Topping[] = {"Tomato", "Green Pepper", "Black Olives", "Mushrooms", "Extra Cheese", "Pepperoni", "Sausage"};
    checkBoxPanel.add(new JCheckBox("Tomato"));
    checkBoxPanel.add(new JCheckBox(Topping[1]));
    checkBoxPanel.add(new JCheckBox(Topping[2]));
    checkBoxPanel.add(new JCheckBox(Topping[3]));
    checkBoxPanel.add(new JCheckBox(Topping[4]));
    checkBoxPanel.add(new JCheckBox(Topping[5]));
    checkBoxPanel.add(new JCheckBox(Topping[6]));       
    //sizes radio buttons
    String size[] = {"Small:$6.50", "Medium:$8.50", "Large:$10.00"};
    JRadioButton radio = new JRadioButton(size[0]);
    radio.setBounds(100, 50, 100, 20);
    //  
    panel.add(checkBoxPanel);
    //
    setContentPane(panel);

这是应该根据用户输入执行一些操作的代码。请帮助我使其清晰易读。
这是错误:“该字段 Component.x 不可见”

Answer 1

是的，这就是 JPanel 是为了。它是一个空容器，有内部布局管理器，可以放置在 JFrame 中的任何位置。 (或在另一个 JPanel 内)。所以，只是给你一个例子，你可以:

JPanel checkBoxPanel = new JPanel(new GridLayout(..));
JPanel fieldsPanel = new JPanel(new BoxLayout(..));

checkBoxPanel.add(new JCheckBox(..));

fieldsPanel.add(new JTextField(..));

frame.setLayout(new BorderLayout());
frame.add(checkBoxPanel, BorderLayout.NORTH);
frame.add(..)