使用菜单使用JApplet [英] Working with JApplet with Menus
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问题描述
我的代码有问题. (音乐)菜单的子菜单应为单选按钮类型.
I'm having problems with my code. The sub-menu for the (Music) menu should be a radio button type.
这是我的第一个代码:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class AMBAT_FLAB1 extends JApplet implements ActionListener{
JMenuBar mainBar = new JMenuBar();
JMenu menu1 = new JMenu("File");
JMenu menu2 = new JMenu("Format");
JMenu menu3 = new JMenu("Background");
//for file
JMenuItem open = new JMenuItem("Open");
JMenuItem save = new JMenuItem("Save");
JMenuItem reset = new JMenuItem("Reset");
//for format
JMenuItem setFont = new JMenuItem("Set Font");
JMenuItem setColor = new JMenuItem("Set Color");
//for background
JMenuItem image = new JMenuItem("Images");
JMenuItem music = new JMenuItem("Music");
//submenu of music
JRadioButtonMenuItem play = new JRadioButtonMenuItem("Play");
JRadioButtonMenuItem loop = new JRadioButtonMenuItem("Loop");
JRadioButtonMenuItem stop = new JRadioButtonMenuItem("Stop");
ButtonGroup group = new ButtonGroup();
//file chooser
//JFileChooser fileChooser = new JFileChooser();
//fileChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
//text area
JTextArea myArea = new JTextArea(50, 50);
JScrollPane scrollingArea = new JScrollPane(myArea);
Container con = getContentPane();
public void init(){
setJMenuBar(mainBar);
mainBar.add(menu1);
mainBar.add(menu2);
mainBar.add(menu3);
menu1.add(open);
menu1.add(save);
menu1.add(reset);
menu2.add(setFont);
menu2.add(setColor);
menu3.add(image);
menu3.add(music);
music.group.add(play);
//group.add(loop);
//music.add(stop);
open.addActionListener(this);
save.addActionListener(this);
reset.addActionListener(this);
setFont.addActionListener(this);
setColor.addActionListener(this);
image.addActionListener(this);
music.addActionListener(this);
}
public void actionPerformed(ActionEvent e){
}
}
当我尝试运行它时,音乐"菜单没有出现.变为播放(单选按钮).按钮组有帮助吗?当我尝试使用按钮组时,什么也没发生.
When I try to run it, the Music menu doesn't appear. It changes to the Play (radio button). Does the button group help? When i tried to use the button group nothing happens.
推荐答案
喜欢吗?
/* <applet code='AMBAT_FLAB1' width=220 height=100></applet> */
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class AMBAT_FLAB1 extends JApplet implements ActionListener{
JMenuBar mainBar = new JMenuBar();
JMenu menu1 = new JMenu("File");
JMenu menu2 = new JMenu("Format");
JMenu menu3 = new JMenu("Background");
//for file
JMenuItem open = new JMenuItem("Open");
JMenuItem save = new JMenuItem("Save");
JMenuItem reset = new JMenuItem("Reset");
//for format
JMenuItem setFont = new JMenuItem("Set Font");
JMenuItem setColor = new JMenuItem("Set Color");
//for background
JMenuItem image = new JMenuItem("Images");
JMenu music = new JMenu("Music");
//submenu of music
JRadioButtonMenuItem play = new JRadioButtonMenuItem("Play");
JRadioButtonMenuItem loop = new JRadioButtonMenuItem("Loop");
JRadioButtonMenuItem stop = new JRadioButtonMenuItem("Stop");
ButtonGroup group = new ButtonGroup();
//file chooser
//JFileChooser fileChooser = new JFileChooser();
//fileChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
//text area
JTextArea myArea = new JTextArea(50, 50);
JScrollPane scrollingArea = new JScrollPane(myArea);
Container con = getContentPane();
public void init(){
setJMenuBar(mainBar);
mainBar.add(menu1);
mainBar.add(menu2);
mainBar.add(menu3);
menu1.add(open);
menu1.add(save);
menu1.add(reset);
menu2.add(setFont);
menu2.add(setColor);
menu3.add(image);
menu3.add(music);
group.add(play);
group.add(loop);
group.add(stop);
music.add(play);
music.add(loop);
music.add(stop);
//music.add(stop);
open.addActionListener(this);
save.addActionListener(this);
reset.addActionListener(this);
setFont.addActionListener(this);
setColor.addActionListener(this);
image.addActionListener(this);
music.addActionListener(this);
}
public void actionPerformed(ActionEvent e){
}
}
代码中的错误基本上是:
The mistakes in the code were basically:
- 如果音乐中有孩子,则必须是
JMenu
,而不是JMenuItem
-
ButtonGroup
是一个逻辑组(例如,使一组按钮中的单选按钮成为可能),它不是是一个容器.因此,除了将按钮添加到组之外,还必须将它们添加到音乐JMenu
.
- If Music had children, it had to be a
JMenu
, not aJMenuItem
- A
ButtonGroup
is a logical group (e.g. to make radio buttons out of a group of buttons), it is not a container. So besides adding the buttons to the group, it is necessary to add them to the MusicJMenu
.
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