问题
As of now, I have this
And this is my source code for MyFrame1:
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.Insets;
import java.awt.Color;
import java.awt.Color.*;
import java.awt.Font;
import java.awt.Font.*;
import java.io.*;
import java.io.BufferedReader;
import java.io.FileReader;
import javax.swing.JLabel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.EmptyBorder;
public class Test
{
public static void main(String[] args)
{
new Test();
}
public Test()
{
String line = "";
EventQueue.invokeLater(new Runnable()
{
@Override
public void run()
{
try
{
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
}
catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException e)
{
e.printStackTrace();
}
JMenuBar mBar = new JMenuBar();
//creating new JMenuItem
JMenuItem mHelp = new JMenuItem("Help");
JMenuItem mCredits = new JMenuItem("Credits");
JMenuItem mExit = new JMenuItem("Exit");
/*try
{
BufferedReader br = new BufferedReader(new FileReader("1.txt"));
line = br.readLine();
}
catch(Exception e)
{
e.printStackTrace();
}*/
JLabel jUser = new JLabel("User is: " );
mHelp.setOpaque(false);
mHelp.setForeground(Color.DARK_GRAY);
mHelp.setFont(new Font("Verdana", Font.PLAIN,12));
mCredits.setOpaque(false);
mCredits.setForeground(Color.DARK_GRAY);
mCredits.setFont(new Font("Verdana", Font.PLAIN,12));
mExit.setOpaque(false);
mExit.setForeground(Color.DARK_GRAY);
mExit.setFont(new Font("Verdana", Font.PLAIN,12));
mBar.add(mHelp);
mBar.add(mCredits);
mBar.add(mExit);
mBar.add(jUser);
//mBar.add(line);
JFrame frame = new JFrame("MYFRAME");
frame.setJMenuBar(mBar);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
frame.setResizable(false);
}
});
}
public class TestPane extends JPanel
{
public TestPane()
{
setBorder(new EmptyBorder(20, 20, 20, 20));
setLayout(new GridLayout(3, 3, 60, 60));
add(makeButton("Account Code"));
add(makeButton("Unit Details"));
add(makeButton("Item Details"));
add(makeButton("Clearing"));
add(makeButton("Search"));
add(makeButton("Exit"));
}
protected JButton makeButton(String text)
{
JButton btn = new JButton(text);
btn.setFont(new Font("Verdana", Font.PLAIN,18));
btn.setMargin(new Insets(30, 30, 30, 30));
btn.setBackground(Color.blue);
btn.setOpaque(true);
btn.setBorderPainted(false);
return btn;
}
}
}
I am still new and still have a small knowledge about Java and GUI. I am still learning about it so I am doing Trial-Error on my program. I tried using UIManager, or UILayout, but still not working for me or I still dont know how to use it. I really want to learn more about GUI and Java, please help me. Any comments, remarks, suggestions are accepted and well-appreciated.
MyFrame1:
As for the output I am aiming for this kind, pls. see next picture.
MyDesireOutput:
Also if you notice there's a bufferedReader, I am practicing to read a "1.txt" with a String, and putting it as label or (still dont know about it) in the menu bar...
回答1:
First you must know these
JMenuBar:
An implementation of a menu bar. You add JMenu objects to the menu bar to construct a menu.
JMenu:
An implementation of a menu -- a popup window containing JMenuItems that is displayed when the user selects an item on the JMenuBar.
JMenuItem:
An implementation of an item in a menu.
So add your JMenuItems to JMenu, later add this JMenu to JMenuBar.
//creating a menu `Options`
JMenu menu = new JMenu("Options");
//creating menu items
JMenuItem mHelp = new JMenuItem("Help");
JMenuItem mCredits = new JMenuItem("Credits");
JMenuItem mExit = new JMenuItem("Exit");
//adding all menu items to menu
menu.add(mHelp);
menu.add(mCredits);
menu.add(mExit);
//adding menu to menu bar
mBar.add(menu);
//aligning label to right corner of window
mBar.add(Box.createHorizontalGlue());
mBar.add(jUser);//label
Output:
回答2:
You should add your JMenuItems to JMenu objects and then add your JMenus to your JMenuBar.
JMenuBar mBar = new JMenuBar();
//creating new JMenuItem
JMenuItem mHelp = new JMenuItem("Help");
JMenu help = new JMenu("Help");
help.add(mHelp);
JMenuItem mCredits = new JMenuItem("Credits");
JMenu credits = new JMenu("Credits");
credits.add(mCredits);
JMenuItem mExit = new JMenuItem("Exit");
JMenu exit = new JMenu("Exit");
exit.add(exit);
/*try
{
BufferedReader br = new BufferedReader(new FileReader("1.txt"));
line = br.readLine();
}
catch(Exception e)
{
e.printStackTrace();
}*/
JLabel jUser = new JLabel("User is: " );
mHelp.setOpaque(false);
mHelp.setForeground(Color.DARK_GRAY);
mHelp.setFont(new Font("Verdana", Font.PLAIN,12));
mCredits.setOpaque(false);
mCredits.setForeground(Color.DARK_GRAY);
mCredits.setFont(new Font("Verdana", Font.PLAIN,12));
mExit.setOpaque(false);
mExit.setForeground(Color.DARK_GRAY);
mExit.setFont(new Font("Verdana", Font.PLAIN,12));
mBar.add(help);
mBar.add(credits);
mBar.add(exit);
But adding a JLabel to JMenuBar is not a good idea. If you want to have something like you depicted in you question, you may want to add a JPanel to the north region of your frame, and then add the User label to the FlowLayout.TRAILING region of that panel:
mBar.add(help);
mBar.add(credits);
mBar.add(exit);
//mBar.add(jUser);
//mBar.add(line);
JPanel statusPanel = new JPanel(new FlowLayout(FlowLayout.TRAILING));
statusPanel.add(jUser);
statusPanel.add(new JLabel("Loen Seto"));
JFrame frame = new JFrame("MYFRAME");
frame.setJMenuBar(mBar);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(statusPanel, BorderLayout.NORTH);
frame.add(new TestPane(), BorderLayout.CENTER);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
frame.setResizable(false);
Good Luck
来源：https://stackoverflow.com/questions/35100674/how-to-remove-the-space-in-jmenu-items