事件5：小综合

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Customer extends JApplet
...{
    //Variable for the panel 
    JPanel panelObject;

      //variables for labels
    JLabel labelCustName; 
    JLabel labelCustCellNo;
    JLabel labelCustPackage; 
    JLabel labelCustAge;

    //variables for data entry controls 
    JTextField textCustName;  
    JTextField textCustCellNo;
    JComboBox comboCustPackage;
     JTextField textCustAge;

    //Variables for the layout
    GridBagLayout gbObject;
    GridBagConstraints gbc;
    
    JButton submit ;
    JButton reStart;
    public void init()
    ...{
        //Initialize the layout variables
        gbObject = new GridBagLayout();
        gbc = new GridBagConstraints();
        panelObject = (JPanel)this.getContentPane();
    
        panelObject.setLayout(gbObject);
            
            //Initialize label controls 
        labelCustName = new JLabel("Customer Name");
        labelCustCellNo = new JLabel("Cell Number");
        labelCustPackage = new JLabel("Package");
        labelCustAge = new JLabel("Age");

        //Initialize data entry controls
        textCustName = new JTextField(30);
        textCustCellNo = new JTextField(15);
            textCustAge = new JTextField(2);
        String packages[] = ...{ "-----------------","Executive", "Standard"};
        comboCustPackage = new JComboBox(packages);
        
        submit = new JButton("Submit");
        reStart=new JButton("reStart");
        //Add controls for Customer Name 
        gbc.anchor = GridBagConstraints.NORTHWEST;
        gbc.gridx = 1;
        gbc.gridy = 5;
        gbObject.setConstraints(labelCustName,gbc);
        panelObject.add(labelCustName);
    
        gbc.anchor = GridBagConstraints.NORTHWEST;
        gbc.gridx = 4;
        gbc.gridy = 5;
        gbObject.setConstraints(textCustName,gbc);
        panelObject.add(textCustName);

        //Add controls for Cell Number
        gbc.anchor = GridBagConstraints.NORTHWEST;    
        gbc.gridx = 1;
        gbc.gridy = 8;
        gbObject.setConstraints(labelCustCellNo,gbc);
        panelObject.add(labelCustCellNo);

        gbc.anchor = GridBagConstraints.NORTHWEST;
        gbc.gridx = 4;
        gbc.gridy = 8;
        gbObject.setConstraints(textCustCellNo,gbc);
        panelObject.add(textCustCellNo);


        //Add controls for Package
        gbc.anchor = GridBagConstraints.NORTHWEST;
        gbc.gridx = 1;
        gbc.gridy = 11;
        gbObject.setConstraints(labelCustPackage,gbc);
        panelObject.add(labelCustPackage);

        gbc.anchor = GridBagConstraints.NORTHWEST;
        gbc.gridx = 4;
        gbc.gridy = 11;
        gbObject.setConstraints(comboCustPackage,gbc);
        panelObject.add(comboCustPackage);

            //Add controls for Customer Age
        gbc.anchor = GridBagConstraints.NORTHWEST;
        gbc.gridx = 1;
        gbc.gridy = 14;
        gbObject.setConstraints(labelCustAge,gbc);
        panelObject.add(labelCustAge);

        gbc.anchor = GridBagConstraints.NORTHWEST;
        gbc.gridx = 4;
        gbc.gridy = 14;
        gbObject.setConstraints(textCustAge,gbc);
        panelObject.add(textCustAge);

        gbc.anchor = GridBagConstraints.NORTHWEST;
        gbc.gridx = 4;
        gbc.gridy = 17;
        gbObject.setConstraints(submit,gbc);
        panelObject.add(submit);
        
        gbc.anchor = GridBagConstraints.NORTHWEST;
        gbc.gridx = 8;
        gbc.gridy = 17;
        gbObject.setConstraints(reStart,gbc);
        panelObject.add(reStart);
        
        reStart.addActionListener(new reStartAction());
        submit.addActionListener(new validate());
    }
    
    class validate implements ActionListener 
    ...{
        public void actionPerformed(ActionEvent e)
         ...{
            if( textCustName.getText().equals("")
               || textCustCellNo.getText().equals("")
             || textCustAge.getText().equals("") )  
             ...{
                  JOptionPane.showMessageDialog(Customer.this,"文本框不能有空");
              }
              if(comboCustPackage.getSelectedIndex()<=0) ...{
                  JOptionPane.showMessageDialog(Customer.this,"组合框必须选择一项！");
              }
              else
               JOptionPane.showMessageDialog(Customer.this,comboCustPackage.getSelectedIndex());
              
                    try...{
                             Integer.parseInt( textCustCellNo.getText());
                    }
                    catch(NumberFormatException ne) ...{
                        JOptionPane.showMessageDialog(Customer.this,"学号必须是数字");
                    }
                    try...{
                             Integer.parseInt(textCustAge.getText());
                    }
                    catch(NumberFormatException ne) ...{
                        JOptionPane.showMessageDialog(Customer.this,"年龄必须是数字");
                    }
        }
    
    }
    
    class reStartAction implements ActionListener...{
        public void actionPerformed(ActionEvent e)...{
            textCustName.setText("");
            textCustCellNo.setText("");
            textCustAge.setText("");
        }
    }
}