使用GridBagLayout将JPanel放置在新行上

Question

我正试图找出一种方法，使用gridbaglayout将包含组合框的面板放在我的JFrame中。目前它出现在另一个相同类型的面板旁边。

这是它的样子：

以下是特定区域的代码

JPanel saleOfferPanel = new JPanel();
JLabel dateOfSale = new JLabel("Select Date of Sale:");     
saleOfferPanel.add(dateOfSale);
JLabel saleDay = new JLabel("Day:");
saleOfferPanel.add(saleDay);
JComboBox<Integer> dayOfSale = new JComboBox<>();
saleOfferPanel.add(dayOfSale);
JLabel saleMonth = new JLabel("Month:");
saleOfferPanel.add(saleMonth);
JComboBox<Integer> monthOfSale = new JComboBox<>();
saleOfferPanel.add(monthOfSale);
JLabel saleYear = new JLabel("Year:");
saleOfferPanel.add(saleYear);
JComboBox<Integer> yearOfSale = new JComboBox<>();
saleOfferPanel.add(yearOfSale);



JPanel endSalePanel = new JPanel();
JLabel endOfSale = new JLabel("Select End Date of Sale:");
saleOfferPanel.add(endOfSale);
JLabel endDay = new JLabel("Day:");
saleOfferPanel.add(endDay);
JComboBox<Integer> endDayOfSale = new JComboBox<>();
saleOfferPanel.add(endDayOfSale);
JLabel endMonth = new JLabel("Month:");
saleOfferPanel.add(endMonth);
JComboBox<Integer> endMonthOfSale = new JComboBox<>();
saleOfferPanel.add(endMonthOfSale);
JLabel endYear = new JLabel("Year:");
saleOfferPanel.add(endYear);
JComboBox<Integer> endYearOfSale = new JComboBox<>();
saleOfferPanel.add(endYearOfSale);

 setLayout(new GridBagLayout());
 GridBagConstraints gbc = new GridBagConstraints();
 gbc.weightx = 0.5;
 gbc.weighty = 0;
 gbc.anchor = GridBagConstraints.NORTHWEST;
 //other panels...

 //panels in question
 gbc.gridx = 0;
 gbc.gridy = 9;
 gbc.gridheight = 1;
 add(saleOfferPanel, gbc);


 gbc.gridx = 0;
 gbc.gridy = 10;
 gbc.gridheight = 1;
 add(endSalePanel, gbc);

希望有人可以提供帮助。

由于

Answer 1

我已经改变了你的代码并成功改变了它的位置。这是代码片段。

`//      setLayout(new GridBagLayout());
         GridBagLayout gb = new GridBagLayout();
         this.setLayout(gb);
         GridBagConstraints gbc = new GridBagConstraints();
         gbc.weightx = 1;
         gbc.weighty = 1;
         gbc.anchor = GridBagConstraints.NORTHWEST;
         gbc.fill = GridBagConstraints.BOTH;
         //other panels...

         //panels in question
         gbc.gridwidth = GridBagConstraints.REMAINDER; //this will tell GridBagLayout component below should be last one on this line.
         gb.setConstraints(saleOfferPanel, gbc);
         this.add(saleOfferPanel);

         gb.setConstraints(endSalePanel, gbc);
         this.add(endSalePanel);
         this.pack();
         this.setSize(500, 200);
         this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         this.setVisible(true);`

Answer 2

仔细查看创建并填充endSalePanel的代码：

JPanel endSalePanel = new JPanel();
JLabel endOfSale = new JLabel("Select End Date of Sale:");
//[KA] Here's where it all starts to go wrong!!!  You wanted to add
//  endOfSale to endSalePanel, but...
saleOfferPanel.add(endOfSale);
JLabel endDay = new JLabel("Day:");
saleOfferPanel.add(endDay);

再次剪切并粘贴！