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所以，这是我的问题：我使用 oracle 文档作为我的项目的示例，但是当我运行程序时，它显示的只是一个中间有“每周工资：”的框。我究竟做错了什么？

JFrame window = new JFrame();
window.setTitle("Weekly Pay");
window.setSize(300, 150);
window.setResizable(false);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Color lGray = new Color(209, 209, 209);
GroupLayout layout = new GroupLayout(window);

JPanel panel = new JPanel();
panel.setBackground(lGray);
panel.setLayout(layout);
layout.setAutoCreateGaps(true);
layout.setAutoCreateContainerGaps(true);

JLabel id = new JLabel("ID Number");
JLabel hw = new JLabel("Hourly Wage");
JLabel rh = new JLabel("Regular Hours");
JLabel oh = new JLabel("Overtime Hours");
JButton calc = new JButton("Calculate");
JTextField idEntry = new JTextField(); //where the user imputs their ID
JTextField hwEntry = new JTextField(); //where the user imputs their hourly wage
JTextField rhEntry = new JTextField(); //where the user imputs their regular hours
JTextField ohEntry = new JTextField(); //where the user imputs their overtime hours
JLabel wp = new JLabel("Weekly Pay:");    

GroupLayout.SequentialGroup hGroup = layout.createSequentialGroup();    
hGroup.addGroup(layout.createParallelGroup().
  addComponent(id).addComponent(hw).addComponent(rh).addComponent(oh).addComponent(calc));
hGroup.addGroup(layout.createParallelGroup().
  addComponent(idEntry).addComponent(hwEntry).addComponent(rhEntry).addComponent(ohEntry).addComponent(wp));
layout.setHorizontalGroup(hGroup);

GroupLayout.SequentialGroup vGroup = layout.createSequentialGroup();    
vGroup.addGroup(layout.createParallelGroup(Alignment.BASELINE).
    addComponent(id).addComponent(idEntry));
vGroup.addGroup(layout.createParallelGroup(Alignment.BASELINE).
    addComponent(hw).addComponent(hwEntry));
vGroup.addGroup(layout.createParallelGroup(Alignment.BASELINE).
    addComponent(rh).addComponent(rhEntry));
vGroup.addGroup(layout.createParallelGroup(Alignment.BASELINE).
    addComponent(oh).addComponent(ohEntry));
vGroup.addGroup(layout.createParallelGroup(Alignment.BASELINE).
    addComponent(calc).addComponent(wp));
layout.setVerticalGroup(vGroup);

window.setVisible(true);
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1 回答 1

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有两个主要问题：您将组布局管理器设置在框架上，而不是面板上，并且您实际上并没有将面板放在框架/窗口上（因为在 java UI 编程中有一个叫做窗口的东西，我质疑将保持框架的变量命名为“窗口”）。

代替“GroupLayout layout = new GroupLayout(window);”，使用“GroupLayout layout = new GroupLayout(panel); // 当然是在面板构建之后”。

然后使用“window.add(panel);” 将面板放在框架/窗口中；我会把这个和“window.pack();” 就在“window.setVisible(true);”之前

rc

于 2012-10-11T23:18:01.523 回答