改变Swing GUI的边界和JButtons的命名



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是多长/宽,它取决于输入的按钮数量,比如这里,例如:

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);
    }       
}
}

正如你所看到的最后5个按钮是不可见的,你必须用鼠标放大一点GUI…前10个按钮比其他按钮小,因为在9之后数字会增加,这是合乎逻辑的,但我能把它们都排成相同的顺序和大小吗?另一个问题,按钮名称"Book"只是为了测试,它应该是1A窗口,1B中间,1C通道一些空间1D通道,1E中间,1F中间,1G通道一些空间1H通道,1I中间,1J窗口和这些2A窗口以下……就像在飞机上一样,任何提示我如何安排命名和它们之间的必要空间都是非常感谢的!

您应该避免使用空布局或绝对定位来安排摆动组件。在这种情况下,总是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:布局管理器视觉指南

为JButton集合动态分配名称,您可以使用:

List<JButton> listOfButtons = new ArrayList<JButton>(collection.size());
       for (int i=0; i < collection.size(); i++) {
              JButton button = new JButton();
              listOfButtons.add(button);
}

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