我的代码存在问题。
添加信息菜单中有三个菜单项（Customer，Merchandize和Employee）。单击它们（使用addActionListener）应显示各种文本字段/单选按钮/组合框（填写信息所需）和提交按钮。
提交所需信息并单击提交按钮后，应将信息打印到弹出窗口。
我被困在最后一点，它应该再次调用actionPerformed方法并将值打印到弹出窗口。有人可以帮忙吗？
已编辑##我已编辑了我的代码。我的问题从第一行开始。 216到行号。 225.当我点击Customer菜单项的“submit3”按钮时，会出现弹出窗口但不显示包含“txt1”内容的字符串的内容。如何将我的组件的值传递给actionPerformed，以便它可以在新的弹出窗口中打印它们？
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.border.TitledBorder;
public class Retail extends JFrame implements ActionListener
{
/**
*
*/
private static final long serialVersionUID = 1L;
JMenuBar menuBar = new JMenuBar();
JMenu addmenu = new JMenu("Add Information");
JMenu delmenu = new JMenu("Delete Information");
JMenu savemenu = new JMenu("Save Information");
JMenuItem emp = new JMenuItem("Employee");
JMenuItem merc = new JMenuItem("Merchandise");
JMenuItem cust = new JMenuItem("Customer");
Container contentPane = getContentPane();
JPanel p2 = new JPanel();
public Retail()
{
super();
contentPane.setLayout(new BorderLayout());
JPanel p1 = new JPanel();
p1.setBorder(new TitledBorder("Select Menu"));
p1.setPreferredSize(new Dimension(500, 100));
contentPane.add(p1,BorderLayout.NORTH);
p2.setBorder(new TitledBorder("Entry Screen"));
p2.setPreferredSize(new Dimension(500,500));
contentPane.add(p2,BorderLayout.CENTER);
p2.setLayout(new BorderLayout());
p1.add(menuBar);
menuBar.add(addmenu);
menuBar.add(delmenu);
menuBar.add(savemenu);
addmenu.add(emp);
addmenu.addSeparator();
addmenu.add(merc);
addmenu.addSeparator();
addmenu.add(cust);
addmenu.addSeparator();
emp.addActionListener(this);
merc.addActionListener(this);
cust.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{
JButton submit1 = new JButton("Submit Employee Information");
JButton submit2 = new JButton("Submit Merchandise Information");
JButton submit3 = new JButton("Submit Customer Information");
if(e.getSource() == emp)
{
p2.removeAll();
p2.updateUI();
String[] states={"MA","AZ","CA"};
JLabel lb1 = new JLabel("First Name:");
JTextField txt1 = new JTextField(12);
JLabel lb2 = new JLabel("Last Name:");
JTextField txt2 = new JTextField(12);
JLabel lb3 = new JLabel("Address:");
JTextField txt3 = new JTextField(12);
JLabel lb4 = new JLabel("City:");
JTextField txt4 = new JTextField(12);
JLabel lb5 = new JLabel("State");
JComboBox cb1 = new JComboBox(states);
JLabel lb6 = new JLabel("ZipCode");
JTextField txt5 = new JTextField(12);
JPanel p3 = new JPanel();
p3.setLayout(new GridLayout(8,1));
JPanel p4 = new JPanel();
p4.setLayout(new GridLayout(1,2));
JLabel lb7= new JLabel("Gender:");
JRadioButton rb1 = new JRadioButton("Male");
JRadioButton rb2 = new JRadioButton("Female");
ButtonGroup bgroup = new ButtonGroup();
bgroup.add(rb1);
bgroup.add(rb2);
JLabel lb8 = new JLabel("Submit Information:");
JPanel p5 = new JPanel();
p5.setLayout(new GridLayout(8,1));
p3.add(lb1);
p3.add(lb2);
p3.add(lb3);
p3.add(lb4);
p3.add(lb5);
p3.add(lb6);
p3.add(lb7);
p3.add(lb8);
p5.add(txt1);
p5.add(txt2);
p5.add(txt3);
p5.add(txt4);
p4.add(rb1);
p4.add(rb2);
p5.add(cb1);
p5.add(txt5);
p5.add(p4);
p5.add(submit1);
p2.add(p3,BorderLayout.WEST);
p2.add(p5,BorderLayout.EAST);
submit1.addActionListener(this);
}
if(e.getSource() == merc)
{
p2.removeAll();
p2.updateUI();
String[] states={"MA","AZ","CA"};
JLabel lb1 = new JLabel("First Name:");
JTextField txt1 = new JTextField(12);
JLabel lb2 = new JLabel("Last Name:");
JTextField txt2 = new JTextField(12);
JLabel lb3 = new JLabel("Address:");
JTextField txt3 = new JTextField(12);
JLabel lb4 = new JLabel("City:");
JTextField txt4 = new JTextField(12);
JLabel lb5 = new JLabel("State");
JComboBox cb1 = new JComboBox(states);
JLabel lb6 = new JLabel("ZipCode");
JTextField txt5 = new JTextField(12);
JPanel p3 = new JPanel();
p3.setLayout(new GridLayout(8,1));
JPanel p4 = new JPanel();
p4.setLayout(new GridLayout(1,2));
JLabel lb7= new JLabel("Gender");
JRadioButton rb1 = new JRadioButton("Male");
JRadioButton rb2 = new JRadioButton("Female");
JLabel lb8 = new JLabel("Submit Information:");
JPanel p5 = new JPanel();
p5.setLayout(new GridLayout(8,1));
p3.add(lb1);
p3.add(lb2);
p3.add(lb3);
p3.add(lb4);
p3.add(lb5);
p3.add(lb6);
p3.add(lb7);
p3.add(lb8);
p5.add(txt1);
p5.add(txt2);
p5.add(txt3);
p5.add(txt4);
p4.add(rb1);
p4.add(rb2);
p5.add(cb1);
p5.add(txt5);
p5.add(p4);
p5.add(submit2);
p2.add(p3,BorderLayout.WEST);
p2.add(p5,BorderLayout.EAST);
submit2.addActionListener(this);
}
if(e.getSource() == cust)
{
p2.removeAll();
p2.updateUI();
String[] states={"MA","AZ","CA"};
JLabel lb1 = new JLabel("First Name:");
JTextField txt1 = new JTextField(12);
JLabel lb2 = new JLabel("Last Name:");
JTextField txt2 = new JTextField(12);
JLabel lb3 = new JLabel("Address:");
JTextField txt3 = new JTextField(12);
JLabel lb4 = new JLabel("City:");
JTextField txt4 = new JTextField(12);
JLabel lb5 = new JLabel("State");
JComboBox cb1 = new JComboBox(states);
JLabel lb6 = new JLabel("ZipCode");
JTextField txt5 = new JTextField(12);
JPanel p3 = new JPanel();
p3.setLayout(new GridLayout(8,1));
JPanel p4 = new JPanel();
p4.setLayout(new GridLayout(1,2));
JLabel lb7= new JLabel("Gender");
JRadioButton rb1 = new JRadioButton("Male");
JRadioButton rb2 = new JRadioButton("Female");
JLabel lb8 = new JLabel("Submit Information:");
JPanel p5 = new JPanel();
p5.setLayout(new GridLayout(8,1));
p3.add(lb1);
p3.add(lb2);
p3.add(lb3);
p3.add(lb4);
p3.add(lb5);
p3.add(lb6);
p3.add(lb7);
p3.add(lb8);
p5.add(txt1);
p5.add(txt2);
p5.add(txt3);
p5.add(txt4);
p4.add(rb1);
p4.add(rb2);
p5.add(cb1);
p5.add(txt5);
p5.add(p4);
p5.add(submit3);
p2.add(p3,BorderLayout.WEST);
p2.add(p5,BorderLayout.EAST);
final String s;
s = txt1.getText();
submit3.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent args0)
{
JOptionPane.showMessageDialog(rootPane,s);
}
});
}
}
public static void main(String[] args)
{
Retail frame = new Retail();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setTitle("Retail Information");
frame.pack();
frame.setResizable(true);
frame.setVisible(true);
}
}
答案 0 :(得分：3)
最后一次测试：
if(e.getSource()==submit1)
永远不会成功，因为submit1是您刚刚在JButton开头构建的actionPerformed，因此无法成为当前事件的来源。
我建议您使用CardLayout作为p2，而不是构建像这样的新布局组件，只需转到动作处理程序中的相应卡片即可。这样，您可以为所有按钮注册一次监听器，您将收到正确的所有事件通知。
此外，您应该为每个UI组件注册单独的actionPerformed，而不是让一个巨型ActionListeners测试源。这使逻辑（和代码）更加清晰。
修改
例如，而不是：
emp.addActionListener(this);
merc.addActionListener(this);
cust.addActionListener(this);
你可以这样做：
emp.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// logic for click on emp button
}
});
merc.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// logic for click on merc button
}
});
// etc.
您的主要课程不需要implements ActionListener。
然后，如果对CardLayout使用p2，则可以在程序开始时将动作侦听器附加到每个界面元素。然后，响应任何特定操作的逻辑变得更加简单 - 仅更新适当的UI元素并切换要在p2中显示的“卡”。有关最后一部分的详细信息，请参阅the docs for CardLayout。
答案 1 :(得分：2)
您可以调用相应下一个菜单项
的.doClick（）OR
定义separete方法（例如doEmpAction（）和doCustAction（）），这些方法从相应的actionPerformed（）方法调用并从另一个方法中调用它们。所以doCustAction只需调用doEmpAction。
答案 2 :(得分：1)
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.border.TitledBorder;
public class Retail extends JFrame implements ActionListener {
/**
*
*/
private static final long serialVersionUID = 1L;
JMenuBar menuBar = new JMenuBar();
JMenu addmenu = new JMenu("Add Information");
JMenu delmenu = new JMenu("Delete Information");
JMenu savemenu = new JMenu("Save Information");
JMenuItem emp = new JMenuItem("Employee");
JMenuItem merc = new JMenuItem("Merchandise");
JMenuItem cust = new JMenuItem("Customer");
Container contentPane = getContentPane();
JPanel p2 = new JPanel();
public Retail() {
super();
contentPane.setLayout(new BorderLayout());
JPanel p1 = new JPanel();
p1.setBorder(new TitledBorder("Select Menu"));
p1.setPreferredSize(new Dimension(500, 100));
contentPane.add(p1, BorderLayout.NORTH);
p2.setBorder(new TitledBorder("Entry Screen"));
p2.setPreferredSize(new Dimension(500, 500));
contentPane.add(p2, BorderLayout.CENTER);
p2.setLayout(new BorderLayout());
p1.add(menuBar);
menuBar.add(addmenu);
menuBar.add(delmenu);
menuBar.add(savemenu);
addmenu.add(emp);
addmenu.addSeparator();
addmenu.add(merc);
addmenu.addSeparator();
addmenu.add(cust);
addmenu.addSeparator();
emp.addActionListener(this);
merc.addActionListener(this);
cust.addActionListener(this);
}
public void actionPerformed(ActionEvent e) {
JButton submit1 = new JButton("Submit Employee Information");
JButton submit2 = new JButton("Submit Merchandise Information");
JButton submit3 = new JButton("Submit Customer Information");
if (e.getSource() == emp) {
p2.removeAll();
p2.updateUI();
String[] states = {"MA", "AZ", "CA"};
JLabel lb1 = new JLabel("First Name:");
JTextField txt1 = new JTextField(12);
JLabel lb2 = new JLabel("Last Name:");
JTextField txt2 = new JTextField(12);
JLabel lb3 = new JLabel("Address:");
JTextField txt3 = new JTextField(12);
JLabel lb4 = new JLabel("City:");
JTextField txt4 = new JTextField(12);
JLabel lb5 = new JLabel("State");
JComboBox cb1 = new JComboBox(states);
JLabel lb6 = new JLabel("ZipCode");
JTextField txt5 = new JTextField(12);
JPanel p3 = new JPanel();
p3.setLayout(new GridLayout(8, 1));
JPanel p4 = new JPanel();
p4.setLayout(new GridLayout(1, 2));
JLabel lb7 = new JLabel("Gender:");
JRadioButton rb1 = new JRadioButton("Male");
JRadioButton rb2 = new JRadioButton("Female");
ButtonGroup bgroup = new ButtonGroup();
bgroup.add(rb1);
bgroup.add(rb2);
JLabel lb8 = new JLabel("Submit Information:");
JPanel p5 = new JPanel();
p5.setLayout(new GridLayout(8, 1));
p3.add(lb1);
p3.add(lb2);
p3.add(lb3);
p3.add(lb4);
p3.add(lb5);
p3.add(lb6);
p3.add(lb7);
p3.add(lb8);
p5.add(txt1);
p5.add(txt2);
p5.add(txt3);
p5.add(txt4);
p4.add(rb1);
p4.add(rb2);
p5.add(cb1);
p5.add(txt5);
p5.add(p4);
p5.add(submit1);
p2.add(p3, BorderLayout.WEST);
p2.add(p5, BorderLayout.EAST);
submit1.addActionListener(this);//instead of this line use next line to add actionlistener.
}
if (e.getSource() == merc) {
p2.removeAll();
p2.updateUI();
String[] states = {"MA", "AZ", "CA"};
JLabel lb1 = new JLabel("First Name:");
JTextField txt1 = new JTextField(12);
JLabel lb2 = new JLabel("Last Name:");
JTextField txt2 = new JTextField(12);
JLabel lb3 = new JLabel("Address:");
JTextField txt3 = new JTextField(12);
JLabel lb4 = new JLabel("City:");
JTextField txt4 = new JTextField(12);
JLabel lb5 = new JLabel("State");
JComboBox cb1 = new JComboBox(states);
JLabel lb6 = new JLabel("ZipCode");
JTextField txt5 = new JTextField(12);
JPanel p3 = new JPanel();
p3.setLayout(new GridLayout(8, 1));
JPanel p4 = new JPanel();
p4.setLayout(new GridLayout(1, 2));
JLabel lb7 = new JLabel("Gender");
JRadioButton rb1 = new JRadioButton("Male");
JRadioButton rb2 = new JRadioButton("Female");
JLabel lb8 = new JLabel("Submit Information:");
JPanel p5 = new JPanel();
p5.setLayout(new GridLayout(8, 1));
p3.add(lb1);
p3.add(lb2);
p3.add(lb3);
p3.add(lb4);
p3.add(lb5);
p3.add(lb6);
p3.add(lb7);
p3.add(lb8);
p5.add(txt1);
p5.add(txt2);
p5.add(txt3);
p5.add(txt4);
p4.add(rb1);
p4.add(rb2);
p5.add(cb1);
p5.add(txt5);
p5.add(p4);
p5.add(submit2);
p2.add(p3, BorderLayout.WEST);
p2.add(p5, BorderLayout.EAST);
submit2.addActionListener(this);//instead of this line use next line to add actionlistener.
}
if (e.getSource() == cust) {
p2.removeAll();
p2.updateUI();
String[] states = {"MA", "AZ", "CA"};
JLabel lb1 = new JLabel("First Name:");
final JTextField txt1 = new JTextField(12);
JLabel lb2 = new JLabel("Last Name:");
JTextField txt2 = new JTextField(12);
JLabel lb3 = new JLabel("Address:");
JTextField txt3 = new JTextField(12);
JLabel lb4 = new JLabel("City:");
JTextField txt4 = new JTextField(12);
JLabel lb5 = new JLabel("State");
JComboBox cb1 = new JComboBox(states);
JLabel lb6 = new JLabel("ZipCode");
JTextField txt5 = new JTextField(12);
JPanel p3 = new JPanel();
p3.setLayout(new GridLayout(8, 1));
JPanel p4 = new JPanel();
p4.setLayout(new GridLayout(1, 2));
JLabel lb7 = new JLabel("Gender");
JRadioButton rb1 = new JRadioButton("Male");
JRadioButton rb2 = new JRadioButton("Female");
JLabel lb8 = new JLabel("Submit Information:");
JPanel p5 = new JPanel();
p5.setLayout(new GridLayout(8, 1));
p3.add(lb1);
p3.add(lb2);
p3.add(lb3);
p3.add(lb4);
p3.add(lb5);
p3.add(lb6);
p3.add(lb7);
p3.add(lb8);
p5.add(txt1);
p5.add(txt2);
p5.add(txt3);
p5.add(txt4);
p4.add(rb1);
p4.add(rb2);
p5.add(cb1);
p5.add(txt5);
p5.add(p4);
p5.add(submit3);
p2.add(p3, BorderLayout.WEST);
p2.add(p5, BorderLayout.EAST);
//submit3.addActionListener(this);//instead of this line use next line to add actionlistener.Commment this line.
submit3.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
System.out.println("------>" + txt1.getText());
//JOptionPane.showMessageDialog(rootPane, txt1.getText());
new MyDialog(txt1.getText());
}
});
// submit3.addActionListener(new SubmitActionListener(txt1.getText()));//out action listener
}
if (e.getSource() == submit1) {
JOptionPane.showMessageDialog(rootPane, " button is clicked");
}
}
class MyDialog extends JDialog {
public MyDialog(String textbox1) {
JLabel label = new JLabel(textbox1);
add(label);
setModalityType(ModalityType.APPLICATION_MODAL);
setTitle("Info");
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
setLocationRelativeTo(null);
setSize(300, 200);
setVisible(true);
}
}
public static void main(String[] args) {
Retail frame = new Retail();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setTitle("Retail Information");
frame.pack();
frame.setResizable(true);
frame.setVisible(true);
}
}
这适用于submit3按钮。根据需要修改其他人。