Java :组件位置

Question

我尝试将组件放置在面板中，如下所示：

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但在我的代码中，它看起来是这样的：

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我在没有FlowLayout的情况下尝试过，但问题是一样的。当我将窗口大小设为最大值时，它会在一行中显示，但当我尝试调整窗口大小时，组件会从边框中移出。

你能帮我解决这个问题吗？下面是我的代码：

    CNameLabel=new JLabel("Customer Name");

    CNameTextField = new JTextField (20); // create the Customer Name text field
    CNameTextField.setEditable(true);     // set editable text box

    CIDLabel=new JLabel("Customer ID");

    C_IDTextField = new JTextField (10);
    C_IDTextField.setEditable(true);      // set editable text box

    // Creating and populating the Top Panel

下面的代码用于创建面板，设置面板的边框，以及设置组件的流布局：

     topPanel=new JPanel();
     topPanel.setLayout(new FlowLayout());
     topPanel.setBorder(new TitledBorder(new EtchedBorder(), "Customer Data"));
     topPanel.add(CNameLabel); topPanel.add(CNameTextField); topPanel.add(CIDLabel);
     topPanel.add(C_IDTextField);

     roomTypeLabel=new JLabel ("Room Type ");

        //Create and populate Room type combo box
        roomTypeCombo = new JComboBox();
        roomTypeCombo.addItem( "Budget($50)" );
        roomTypeCombo.addItem( "Standard($75)" );
        roomTypeCombo.addItem( "Executive($200)" );
        roomTypeCombo.addItem( "Luxury($400)" );

        mealLabel=new JLabel ("Meal ");

        //Create and populate Meal type combo box
        mealCombo = new JComboBox();
        mealCombo.addItem( "None" );
        mealCombo.addItem( "Breakfast Only($10)" );
        mealCombo.addItem( "Any Two($30)" );
        mealCombo.addItem( "All Three($50)" );

        daysLabel=new JLabel ("Days");

        //Create and populate Days combo box

        daysCombo = new JComboBox();

        for(int i=0;i<31 ; i++)
                {

         daysCombo.addItem(i); // populate combobox with days

            }

       //Adding components to top panel

        topPanel.add(roomTypeLabel);
        topPanel.add(roomTypeCombo);
        topPanel.add(mealLabel);
        topPanel.add(mealCombo);
        topPanel.add(daysLabel);
        topPanel.add(daysCombo);

我刚刚跳过了组件的包和声明。程序运行状况良好。

提前谢谢。

Answer 1

最后，您可能需要调用pack()。我猜如果你想在newline中输入房间类型，那么你需要使用gridlayout，但不要忘记最后调用pack()。