我的下面的代码有问题。
“添加信息”菜单中有三个菜单项(“客户”,“商品”和“员工”)。单击它们(使用addActionListener
)应显示各种文本字段/单选按钮/组合框(需要填写信息)和一个提交按钮。
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?
EDITED ##我已经编辑了我的代码。我的问题从第几行开始。 216行号225.当我单击“客户”菜单项的“ submit3”按钮时,弹出窗口出现,但未显示包含“ txt1”内容的字符串的内容。如何将组件的值传递给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);
}
}
最佳答案
最后的测试:
if(e.getSource()==submit1)
永远不会成功,因为
submit1
是您刚在JButton
开头构造的actionPerformed
,因此不能成为当前事件的源。建议不要使用
CardLayout
表示p2
,而不要像这样构造新的布局组件,而只需在动作处理程序中翻转到相应的卡片即可。这样,您可以一次为所有按钮注册侦听器,并且将正确通知所有事件。同样,您应该为每个UI组件注册一个单独的
actionPerformed
,而不是使用一个巨型的ActionListeners
来测试源。这样可以使逻辑(和代码)更加清晰。编辑
例如,代替此:
emp.addActionListener(this);
merc.addActionListener(this);
cust.addActionListener(this);
您可以这样做:
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.
然后,您不需要主课程的
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接口元素上。这样,响应任何特定动作的逻辑就变得更加简单-仅更新适当的UI元素并切换要显示在p2
中的“卡片”。有关最后一部分的更多信息,请参见the docs for CardLayout
。关于java - 如何在actionPerformed()中调用actionPerformed(),我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/13506467/