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我有一個程序，其中JMenuButtonItem應該被選中，並且ActionListener用任何選定的內容更新JTextField。但是，它只顯示在buildPhonePackageMenu（）中預選爲true的內容。如果true不在參數中，則NO單選按鈕被識別爲選中。 buildPhoneModelMenu（）似乎工作正常。JTextField卡住了ActionListener的特定文本
任何人都可以幫我找出爲什麼一個菜單的作品，而不是其他？我已經花了6個小時試圖弄清楚。 謝謝！
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.text.DecimalFormat;
public class CellPhoneCalculator extends JFrame{
private JMenuBar menuBar; //Menu bar to hold drop down menus.
private JMenu fileMenu; //file menu
private JMenu phonePackage; //menu containing phone packages and options
private JMenu phoneModels; //menu containing cell phone models.
private JMenuItem exit;//Exit button
private JRadioButtonMenuItem package300; //300 minute cell phone package
private JRadioButtonMenuItem package800; //800 minute cell phone package
private JRadioButtonMenuItem package1500; //1500 minute cell phone package.
private JRadioButtonMenuItem phone100; //phone model 100
private JRadioButtonMenuItem phone110; //phone model 110
private JRadioButtonMenuItem phone200; //phone model 200
private JCheckBoxMenuItem vmail; //voicemail option
private JCheckBoxMenuItem text; //text messaging option
private JLabel packageSelected;//Displays the text "Cell Phone Package:"
private JLabel modelSelected; //Displays the text "Cell Phone Model:"
private JLabel optionsSelected; //Displays the text "Options Selected:"
private JLabel subtotal; //Displays the text "Subtotal."
private JLabel tax; //Displays the text "Sales Tax (6%) :"
private JLabel total; //Displays the text "Total:"
private JTextField pSelected; //displays the selected cell phone package.
private JTextField mSelected; //displays the selected cell phone model.
private JTextField oSelectedV; //Displays the Voice Mail option selected.
private JTextField oSelectedT; //Displays the Text option selected.
private JTextField dspSub; //displays the subtotal
private JTextField dspTax; //displays the sales tax amount on subtotal
private JTextField dspTotal; //displays the total after tax.
public CellPhoneCalculator()
{
//call the superclass constructor to instantiate a JFrame
//with a String argument to be title.
super("Cell Phone Package Pricing Calculator");
//Exit on window close
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
buildPricePane();//builds the price panel to go into content pane
buildMenuBar();//Builds the menu bar.
buildPhonePackageMenu();//Builds phone package menu
buildFileMenu();//Builds the File Menu
//pack method to resize JFrame.
pack();
//Set visibility of panel.
setVisible(true);
}
private void buildMenuBar()
{
menuBar = new JMenuBar();//Create the menu bar
buildFileMenu(); //build the file menu
buildPhonePackageMenu();//build the phone package menu
buildPhoneModelMenu();//build the phone model menu
//Add the menus to the menuBar.
menuBar.add(fileMenu);
menuBar.add(phonePackage);
menuBar.add(phoneModels);
setJMenuBar(menuBar);//sets the menu bar for the window.
}
private void buildPhonePackageMenu()
{
phonePackage = new JMenu("Cell Phone Packages");//Drop down containing phone plan
//packages and options.
//Make the radio buttons for cell phone packages.
package300 = new JRadioButtonMenuItem("300 minute package", true);
package800 = new JRadioButtonMenuItem("800 minute package");
package1500 = new JRadioButtonMenuItem("1500 minute package");
//Register the action listener PackageListener with the radio buttons.
package300.addActionListener(new PackageListener());
package800.addActionListener(new PackageListener());
package1500.addActionListener(new PackageListener());
//Make new button group for packages so buttons are mutually exclusive.
ButtonGroup packages = new ButtonGroup();
//Add radio buttons to packages button group.
packages.add(package300);
packages.add(package800);
packages.add(package1500);
//Create phone option check boxes.
vmail = new JCheckBoxMenuItem("Voice Mail");
text = new JCheckBoxMenuItem("Text Mail");
//Register Item Listener with check box options.
vmail.addItemListener(new OptionsListener());
text.addItemListener(new OptionsListener());
//Add components to menu
phonePackage.add(package300);
phonePackage.add(package800);
phonePackage.add(package1500);
phonePackage.addSeparator();//Add a separator before phone options
phonePackage.add(vmail);
phonePackage.add(text);
}
private void buildFileMenu()
{
//Instantiate file drop down with text "File."
fileMenu = new JMenu("File");
//Create exit button
exit = new JMenuItem("Exit");
//register action listener
exit.addActionListener(new ExitButtonListener());
//add exit menu item to menu
fileMenu.add(exit);
}
/*
* Build the menu to select the phone models.
*/
private void buildPhoneModelMenu()
{
//Create Menu drop down with text "Phone Models."
phoneModels = new JMenu("Phone Models");
//Create new radio buttons in menu, with model 100 preselected.
phone100 = new JRadioButtonMenuItem("Phone Model 100", true);
phone110 = new JRadioButtonMenuItem("Phone Model 110");
phone200 = new JRadioButtonMenuItem("Phone Model 200");
//Register the ActionListener modelListener with the buttons.
phone100.addActionListener(new ModelListener());
phone110.addActionListener(new ModelListener());
phone200.addActionListener(new ModelListener());
//Create new phone model button group.
ButtonGroup phoneModel = new ButtonGroup();
//Add phone model radio buttons to button group, so they're selection is mutually exclusive.
phoneModel.add(phone100);
phoneModel.add(phone110);
phoneModel.add(phone200);
//Add the buttons to the menu.
phoneModels.add(phone100);
phoneModels.add(phone110);
phoneModels.add(phone200);
}
private DecimalFormat dollar = new DecimalFormat("###.##");
/*
* Construct the PricePane with all components.
*/
public void buildPricePane()
{
//Create the JPanel object and assign to pricePanel.
JPanel pricePanel = new JPanel();
setLayout(new GridLayout(13,1));
//Create the text labels for left hand column
packageSelected = new JLabel("Cell Phone Package: ");
modelSelected = new JLabel("Cell Phone Model: ");
optionsSelected = new JLabel("Options Selected: ");
subtotal = new JLabel("Subtotal: ");
tax = new JLabel("Sales Tax (6%): ");
total = new JLabel("Total: ");
//Create the Un-Editable text fields to display selected radio button items
pSelected = new JTextField("", 10);
pSelected.setEditable(false);
mSelected = new JTextField("", 10);
mSelected.setEditable(false);
//Create the Un-Editable text fields to display selected check box items.
oSelectedV = new JTextField(10);
oSelectedV.setEditable(false);
oSelectedT = new JTextField(10);
oSelectedT.setEditable(false);
//Create the un-editable text fields to display subtotal, tax and total.
dspSub = new JTextField("", 10);
dspSub.setEditable(false);
dspTax = new JTextField("", 10);
dspTax.setEditable(false);
dspTotal = new JTextField("", 10);
dspTotal.setEditable(false);
//Add the items and labels to JPanel.
add(packageSelected);
add(pSelected);
add(modelSelected);
add(mSelected);
add(optionsSelected);
add(oSelectedV);
add(oSelectedT);
add(subtotal);
add(dspSub);
add(tax);
add(dspTax);
add(total);
add(dspTotal);
}
/*
* ActionListener interface for the cell phone package radio buttons.
* Sends text and prices to PricePane, to display and sum respectively.
*/
private class PackageListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
if(package300.isSelected())
pSelected.setText("300 minutes per month: $45.00 per month");//Sends display text
if(package800.isSelected())
pSelected.setText("800 minutes per month: $65.00 per month");
if(package1500.isSelected())
pSelected.setText("1500 minutes per month: $99.00 per month");
}
}
/*
* ItemListener interface for the cell phone options check boxes.
*/
private class OptionsListener implements ItemListener
{
public void itemStateChanged(ItemEvent e)
{
if(vmail.isSelected())
oSelectedV.setText("Voice mail: $5.00 per month");
if(text.isSelected())
oSelectedT.setText("Text messaging: $10.00");
}
}
/*
* ActionListener for the cell phone model radio buttons.
*/
private class ModelListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
if(phone100.isSelected())
mSelected.setText("Model 100: $29.95");
if(phone110.isSelected())
mSelected.setText("Model 110: $49.95");
if(phone200.isSelected())
mSelected.setText("Model 200: $99.95");
}
}
/*
* ActionListener interface for exit button to close application.
*/
private class ExitButtonListener implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
System.exit(0);
}
}
/*
* Main function to launch GUI.
*/
public static void main(String[] args)
{
new CellPhoneCalculator();
}
}
考慮刪除問題 – c0der