java - 更改 Swing GUI 的边界和 JButton 的命名

Question

我知道如何设置边界，所以最后一个新的 setbounds() 调用会给出新的边界，但我不知道新的边界应该有多长/多宽，这取决于按钮的输入数量例如这里:

import java.awt.BorderLayout;
import java.awt.Color; 
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JToggleButton;
import javax.swing.border.EmptyBorder;

public class Book_GUI extends JFrame {

private EconomyClass eco;
private JPanel contentPane;

/**
 * Launch the application.
 */
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                Book_GUI frame = new Book_GUI();
                frame.setVisible(true);

            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the frame.
 */
public Book_GUI() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 450, 300);
    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    //contentPane.setLayout(new BorderLayout(0, 0));
    setContentPane(contentPane);
    //this.add(contentPane);
    JButton btnBookFlight;

    //eco = new EconomyClass();
    //eco.setSeats(5);
    for(int i=0;i<45;i++){
    btnBookFlight = new JButton("Book" +i);
        btnBookFlight.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                JButton button = (JButton)arg0.getSource();;
                button.setBackground(Color.RED);
                button.setOpaque(true);
            }
        });
        btnBookFlight.setBounds(77, 351, 100, 23);
        contentPane.add(btnBookFlight);
    }       
}

}

如您所见，最后 5 个按钮不可见，必须用鼠标将 GUI 放大一点...并且前 10 个按钮比其他按钮小，因为在 9 之后数字增加，这是合乎逻辑的，但我可以对齐吗所有这些都以相同的顺序和大小？另一个问题，按钮名称“Book”只是为了测试它应该是 1A Window, 1B Middle, 1C Aisle some space 1D Aisle,1E Middle,1F Middle, 1G Aisle some space 1H Aisle, 1I Middle, 1J Window and below these 2A Window...就像在飞机上一样，非常感谢任何提示我如何安排命名和它们之间的必要空间!

Answer 1

您应该避免使用空布局或绝对定位来安排 swing 组件。在这种情况下始终使用最合适的布局管理器，因为它有很多优点。处理当前情况的最佳布局是 GridLayout

这是使用 GridLayout 修改后的代码版本

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JToggleButton;
import javax.swing.border.EmptyBorder;

public class Book_GUI extends JFrame {

    // private EconomyClass eco;
    private JPanel contentPane;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    Book_GUI frame = new Book_GUI();
                    frame.setVisible(true);

                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public Book_GUI() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        // setBounds(100, 100, 450, 300);

        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        contentPane.setLayout(new GridLayout(9, 5));
        // contentPane.setLayout(new BorderLayout(0, 0));
        setContentPane(contentPane);
        // this.add(contentPane);
        JButton btnBookFlight;

        // eco = new EconomyClass();
        // eco.setSeats(5);
        for (int i = 0; i < 45; i++) {
            btnBookFlight = new JButton("Book" + i);
            btnBookFlight.addActionListener(new ActionListener() {
                public void actionPerformed(ActionEvent arg0) {
                    JButton button = (JButton) arg0.getSource();
                    ;
                    button.setBackground(Color.RED);
                    button.setOpaque(true);
                }
            });
            // btnBookFlight.setBounds(77, 351, 100, 23);
            contentPane.add(btnBookFlight);
        }
        pack();
    }

}

进一步阅读:A Visual Guide to Layout Managers