Question

我正在尝试创建一个按钮数组作为seatChart的模拟，但按钮不会出现在屏幕上，只有框架显示出来。我做错了什么？

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class guiCreator extends JFrame
{
    public guiCreator()
    {
        setTitle("Seats");
        setSize(500, 600);
        addWindowListener(new WindowAdapter()
             {  public void windowClosing(WindowEvent e)
                {  System.exit(0);
                }
             } );

          Container contentPane = getContentPane();
          contentPane.add(new seatingPanel());
        setVisible(true);  
    }

}

class seatingPanel extends JPanel implements ActionListener
{
    public seatingPanel()
    {
        setLayout(new BorderLayout());

        JPanel panel4seating = new JPanel();//creating a grid panel
        panel4seating.setLayout(new GridLayout(4, 10));//setting the layout of the grid panel

        JButton [] seats = new JButton [40]; //creating a pointer to the buttonsArray
        for (int i = 0; i < 40; i++)
        {
            seats[i] = new JButton();//creating the buttons
            seats[i].addActionListener(this);
            panel4seating.add(seats[i]);
        }
    }

    @Override
    public void actionPerformed(ActionEvent evt) 
    {


    }
    //main
    guiCreator flightSeats = new guiCreator();

Answer 1

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class GuiCreator extends JFrame
{
    public GuiCreator()
    {
        super("Seats");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        Container contentPane = getContentPane();
        contentPane.add(new SeatingPanel());

        pack();    

        setVisible(true);
    }

    public static void main(String[] args) {
        new GuiCreator();
    }
}

class SeatingPanel extends JPanel
{
    public SeatingPanel()
    {
        super(new BorderLayout());

        JPanel panel4seating = new JPanel();//creating a grid panel
        panel4seating.setLayout(new GridLayout(4, 10));//setting the layout of the grid panel

        JButton [] seats = new JButton [40]; //creating a pointer to the buttonsArray
        for (int i = 0; i < 40; i++)
        {
            seats[i] = new JButton();//creating the buttons
            //better to set the preferred size of the button
            seats[i].setPreferredSize(new Dimension(50,25));
            panel4seating.add(seats[i]);
        }

        add(panel4seating, BorderLayout.CENTER);
    }
}

应该在EDT上创建GUI（我的懒惰）。
使用驼峰牌表示名称。
在此实例中，无需扩展JFrame或JPanel。

源的其他（未记录的）更改是改进。如果您对更改的任何部分有疑问，请询问。

Answer 2

您在JPanel的构建器中创建了一个新的seatingPanel，但您没有将其添加到seatingPanel本身，因此它根本不会显示。

尝试将其添加到seatPanel的布局中。

（或完全取消该子面板 - 将网格布局和按钮直接设置到seatingPanel。）

为什么我的按钮没有出现？

2 个答案: