按钮和窗口之间的空间 [英] Space between buttons and window

问题描述

我在这里有此代码，其想法是在主窗口中的文本区域旁边有两个按钮，而这些按钮我尚未添加.在尝试使用GridBagLayout并在过程中扯掉头发后，我决定不使用布局并在不可调整大小的窗口内手动放置按钮.

I have this code right here, and the idea is to have two buttons in a main window alongside a text area, which I have not added yet. After trying to use GridBagLayout and ripping off my hair in the process I decided not to use a layout and manually position buttons inside a non resizable window.

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

public class Tema extends JFrame implements ActionListener {

JMenuBar menubar = new JMenuBar();
JMenu actiuni = new JMenu("Actiuni");
JMenu contact = new JMenu("Contact");
JMenu help = new JMenu("Help");
JMenuItem ntest = new JMenuItem("Nou test");
JMenuItem vizarh = new JMenuItem("Vizualizare arhiva");
JMenuItem datcon = new JMenuItem("Date de contact");
JMenuItem sendmail = new JMenuItem("Trimite e-mail");
JMenuItem instrut = new JMenuItem("Instructiuni de utilizare");
JButton b1 = new JButton("Incepe testul!");
JButton b2 = new JButton("Vezi arhiva!");
JTextArea ta = new JTextArea("Default text", 5, 30);

public void common(String s)
{
    setSize(800,450);
    setLocationRelativeTo(null);
    setResizable(false);

    setTitle(s);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);


    menubar.add(actiuni);
    menubar.add(contact);
    menubar.add(help);
    actiuni.add(ntest);
    actiuni.add(vizarh);
    contact.add(datcon);
    contact.add(sendmail);
    help.add(instrut);

    setJMenuBar(menubar);

}

public Tema()
{
    common("Self-Esteem- Fereastra Principala");
    JPanel cp = new JPanel();
    cp.setLayout(null);


    b1.setBounds(100,100,200,100);
    cp.add(b1);


    b2.setBounds(100,250,200,100);
    cp.add(b2);

    setContentPane(cp);
    setVisible(true);

}

public static void main(String[] args)
{
    Tema x = new Tema();
}


@Override
public void actionPerformed (ActionEvent e){           

}

}

但是输出是这样的:

But the output is this:

我的问题是，第二个按钮下方的空间为什么不等于第一个按钮上方的空间?它们都不应该都是100像素吗?

My question is why isn't the space beneath the second button equal to the space above the first button? Shouldn't they both be 100 pixels?

推荐答案

• 不要不必要地扩展JFrame类.
• 请勿使用Absolute/Null LayoutManager.使用适当的LayoutManager，其中包括嵌套布局以实现所需的外观.请参阅此处以获得良好的教程:
  • 布局管理器的可视指南
  • 使用布局管理器
  • Don't extend JFrame class unnecessarily.
  • Never use Absolute/Null LayoutManager. Use an appropriate LayoutManager, this includes nesting Layouts to achieve desired look. see here for good tutorials:
    • A Visual Guide to Layout Managers
    • Using Layout Managers

    以下是我提出的示例(基本上是您的代码已修复)希望对您有所帮助:

    Here is an example I made (basically your code fixed) hope it helps:

    import java.awt.BorderLayout;
    import java.awt.GridLayout;
    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JMenu;
    import javax.swing.JMenuBar;
    import javax.swing.JMenuItem;
    import javax.swing.JPanel;
    import javax.swing.JTextArea;
    import javax.swing.SwingUtilities;
    
    public class LayoutTest {
    
        private final JMenuBar menubar = new JMenuBar();
        private final JMenu actiuni = new JMenu("Actiuni");
        private final JMenu contact = new JMenu("Contact");
        private final JMenu help = new JMenu("Help");
        private final JMenuItem ntest = new JMenuItem("Nou test");
        private final JMenuItem vizarh = new JMenuItem("Vizualizare arhiva");
        private final JMenuItem datcon = new JMenuItem("Date de contact");
        private final JMenuItem sendmail = new JMenuItem("Trimite e-mail");
        private final JMenuItem instrut = new JMenuItem("Instructiuni de utilizare");
        private final JButton b1 = new JButton("Incepe testul!");
        private final JButton b2 = new JButton("Vezi arhiva!");
        private final JTextArea ta = new JTextArea("Default text", 5, 30);
        //create JFrame instance
        private final JFrame frame = new JFrame();
    
        public LayoutTest() {
            initComponents();
        }
    
        public static void main(String[] args) {
            //creat UI on EDT
            SwingUtilities.invokeLater(new Runnable() {
                @Override
                public void run() {
                    new LayoutTest();
                }
            });
        }
    
        private void initComponents() {
            frame.setTitle("Self-Esteem- Fereastra Principala");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    
            menubar.add(actiuni);
            menubar.add(contact);
            menubar.add(help);
            actiuni.add(ntest);
            actiuni.add(vizarh);
            contact.add(datcon);
            contact.add(sendmail);
            help.add(instrut);
    
            frame.setJMenuBar(menubar);
            JPanel textAreaJPanel = new JPanel();
    
            //create button panel with GridLayout(2,1) 
            JPanel buttonJPanel = new JPanel(new GridLayout(2, 1));//new GridLayout(2, 1,10,10) creates gridlayout with horixontal and vertcial spacing of 10
    
            //add buttons to one panel
            buttonJPanel.add(b1);
            buttonJPanel.add(b2);
            //add text area to textarea jPanel
            textAreaJPanel.add(ta);
    
            //add textarea panel to west of content pane (BorderLayout by default)
            frame.add(textAreaJPanel, BorderLayout.WEST);
    
            //add button Panel to EAST of JFrame content pane
            frame.add(buttonJPanel, BorderLayout.EAST);
    
            frame.pack();
    
            frame.setResizable(false);
            frame.setLocationRelativeTo(null);
    
            frame.setVisible(true);
        }
    }
    

    这篇关于按钮和窗口之间的空间的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！