java - 按钮不会相互水平显示。只是相互重叠

Question

我在将按钮打印到我的 java swing 项目时遇到问题。对于类，我想复制一个 GUI。到目前为止，我已经能够做得很好。但是我遇到了一个问题，按钮在同一位置彼此重叠，而不是水平彼此相邻。下面是如何将按钮打印到面板上的图像。

所以我有两个面板，一个包含标签和文本框 (Toppane)，另一个包含按钮，总共 5 个 (bottomPane)。我试图让五个按钮打印在 GUI 的底部，但遇到了困难。我觉得我缺少一些简单的东西。

--------------------------------------------------------------
|                 label [textfield]                          |
|                 label [textField]                          |
|                 label [textfield]                          |
|-------------------------------------------------------------
|  [button] [button] [button] [button] [button]              |
--------------------------------------------------------------

但是我明白了:

--------------------------------------------------------------
|                 label [textfield]                          |
|                 label [textField]                          |
|                 label [textfield]                          |
|-------------------------------------------------------------
|              [        Button's 12345       ]               |
--------------------------------------------------------------

代码:

package book;

import java.awt.BorderLayout;
import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JTextField;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;


/**
 *
 * @author KJ4CC
 */
public class Book extends JFrame  {
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
       Book book = new Book();
        book.bookingUI();
    }
    public static void  bookingUI(){

        //sets windows, and pane in the UI 
        JFrame frame = new JFrame("Ye old Book store");
        JPanel toppane = new JPanel(new GridBagLayout());
        JPanel bottomPane = new JPanel(new GridBagLayout());
        GridBagConstraints c = new GridBagConstraints();
        frame.setSize(1000, 600);
        frame.setVisible(true);

        //adds labels  to the window
        JLabel num = new JLabel("Enter Number of Items in this Order");
        JLabel bookID = new JLabel("111111");
        JLabel quantityItem = new JLabel("222222");
        JLabel itemInfo = new JLabel("333zfgfsfg333");
        JLabel subtotal = new JLabel("4444444");

        //adding the labels to the panel 
        c.anchor = GridBagConstraints.EAST;
        c.weighty = 1;
        c.gridx = 2;
        c.gridy = 1;
        toppane.add(num, c);
        c.gridx = 2;
        c.gridy = 2;
        toppane.add(bookID, c);
        c.gridx = 2;
        c.gridy = 3;
        toppane.add(quantityItem, c);
        c.gridx = 2;
        c.gridy = 4;
        toppane.add(itemInfo,c);
        c.gridx = 2;
        c.gridy = 5;
        toppane.add(subtotal,c);
        bottomPane.setBackground(Color.GREEN);
        frame.add(toppane,BorderLayout.EAST);

       //adds textfields to the frame 
        JTextField amount = new JTextField();
        JTextField id = new JTextField();
        JTextField quantity = new JTextField();
        JTextField info = new JTextField();
        JTextField total = new JTextField();

        //add textfield to panel
        c.ipadx = 230;
        c.gridx = 3;
        c.gridy= 1;
        toppane.add(amount, c);
        c.gridx = 3;
        c.gridy = 2;
        toppane.add(id, c);
        c.gridx = 3;
        c.gridy = 3;
        toppane.add(info, c);
        c.gridx = 3;
        c.gridy = 4;
        toppane.add(total, c);
        c.gridx = 3;
        c.gridy = 5; 
        toppane.add(quantity,c);

    //setting up buttons to be placed onto the bottompanel 
    JButton processItem = new JButton("Process Item");
    JButton confirmItem = new JButton("Confirm Item");
    JButton viewOrder = new JButton("View Order");
    JButton finishOrder = new JButton("Finish Order ");
    JButton newOrder = new JButton("New Order");
    JButton exit = new JButton("Exit");

    //adding the buttons to the pane.
    GridBagConstraints b = new GridBagConstraints();
    b.anchor = GridBagConstraints.NORTHWEST;
    bottomPane.add(processItem, c);
    bottomPane.add(confirmItem,c);
    bottomPane.add(viewOrder, c);
    bottomPane.add(finishOrder,c);
    bottomPane.add(newOrder,c);

    bottomPane.add(exit, c);
    bottomPane.setBackground(Color.BLUE);
    frame.add(bottomPane,BorderLayout.SOUTH);
    }
}

我个人觉得这与我使用的布局管理器有关。我不知道我是否将它正确地用于正确的应用程序。我一直在使用 GridBagLayout，这是我迄今为止在学校使用的所有内容。

Answer 1

您的问题是您对每个新按钮使用相同的约束 c:

bottomPane.add(processItem, c);
bottomPane.add(confirmItem,c);
bottomPane.add(viewOrder, c);
bottomPane.add(finishOrder,c);
bottomPane.add(newOrder,c);

您对 c 所做的最后一次修改是在您这样做的时候:

c.gridx = 3;
c.gridy = 5; 

然后您只需对所有 5 个新按钮重复使用相同的约束，从而将它们全部添加到相同的网格位置。

您需要为每个约束相应地设置约束(例如，设置 c 的值，那里也有未使用的 b)。