Java中的间距标签和按钮

Question

我仍在刷新旧的Java GUI并遇到了一些问题.这只是整个GUI的东西仍然很新鲜,我只使用了FlowLayout(),我猜我正在寻找的东西是不能用它完成的.这不是作业或任何东西,只是我正在做的事情.无论如何,我的问题:

基本上,我希望它看起来像这样

Welcome!
Today's Date is: 
(space)
(space)
Exit button

我的问题是我不知道任何布局足以完成这项工作.我一直在阅读和搞乱,GridBagLayout我无法做任何事情,我尝试了另一种方式,按钮和dang程序一样大.无论如何,这里是我的代码,即使它不应该真的重要.

private void welcomeTab(){
    welcomePanel = new JPanel(new FlowLayout());
    String currentTime = SimpleDateFormat.getInstance().format(
    Calendar.getInstance().getTime());
    final JLabel welcomeLabel = new JLabel("Welcome!", JLabel.CENTER);
    final JLabel dateLabel = new JLabel ("Today's date is: " + currentTime, JLabel.CENTER);
    welcomePanel.add(welcomeLabel);
    welcomePanel.add(dateLabel);
    welcomePanel.add(createExitButton());
}

谢谢.我一直在读这么多,似乎所有的例子都是用所有按钮创建窗格,这让我疯了.

Answer 1

像这样的东西？

import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import java.util.Calendar;
import java.text.SimpleDateFormat;

class WelcomeLayout {

    private JPanel welcomePanel;

    WelcomeLayout() {
        welcomeTab();
        welcomePanel.setBorder(new TitledBorder("The Welcome Panel"));
        JOptionPane.showMessageDialog(null, welcomePanel);
    }

    private void welcomeTab() {
        welcomePanel = new JPanel(new GridLayout(0,1,1,1));
        String currentTime = SimpleDateFormat.getInstance().format(
        Calendar.getInstance().getTime());
        final JLabel welcomeLabel = new JLabel("Welcome!", JLabel.CENTER);
        final JLabel dateLabel = new JLabel ("Today's date is: " + currentTime, JLabel.CENTER);
        welcomePanel.add(welcomeLabel);
        welcomePanel.add(dateLabel);

        // one (kludgy) way to addd space.
        welcomePanel.add(new JLabel(""));
        welcomePanel.add(new JLabel(""));

        welcomePanel.add( createExitButton() );
    }

    private JComponent createExitButton() {
        JButton exit = new JButton("Exit");
        // the FlowLayout is to center the JButton;
        JPanel exitPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
        exitPanel.add(exit);
        return exitPanel;
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                WelcomeLayout wl = new WelcomeLayout();
            }
        });
    }
}

使用BoxLayoutTalha Ahmed Khan /Zéychin建议的

import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import java.util.Calendar;
import java.text.SimpleDateFormat;

class WelcomeBoxLayout {

    private JPanel welcomePanel;

    WelcomeBoxLayout() {
        welcomeTab();
        welcomePanel.setBorder(new TitledBorder("The Welcome Panel"));
        JOptionPane.showMessageDialog(null, welcomePanel);
    }

    private void welcomeTab() {
        welcomePanel = new JPanel();
        BoxLayout layout = new BoxLayout(welcomePanel, BoxLayout.Y_AXIS);
        welcomePanel.setLayout(layout);
        String currentTime = SimpleDateFormat.getInstance().format(
        Calendar.getInstance().getTime());
        final JLabel welcomeLabel = new JLabel("Welcome!", JLabel.CENTER);
        final JLabel dateLabel = new JLabel ("Today's date is: " + currentTime, JLabel.CENTER);
        welcomePanel.add(welcomeLabel);
        welcomePanel.add(dateLabel);

        welcomePanel.add( Box.createVerticalStrut(20) );

        welcomePanel.add( new JButton("Exit") );
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                WelcomeBoxLayout wl = new WelcomeBoxLayout();
            }
        });
    }
}