我有一个程序，其中包含由用户填写的文本字段。根据comboBox中选择的内容，需要不同的字段。如果必填字段留空，我有一个错误处理程序。出于某种原因，我不断收到lastName，birthday和depatermentName的错误。任何人都可以解释为什么即使这些字段有数据也会弹出这些错误？
这是我的代码......
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.util.StringJoiner;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JOptionPane;
import javax.swing.JComboBox;
@SuppressWarnings("serial")
public class AddEmployeeDisplay extends JFrame
{
private EmployeeQueries employeeQueries;
private JPanel displayPanel;
private JButton addEmpButton;
private JButton clearButton;
private JLabel firstNameLabel;
private JTextField firstNameText;
private JLabel lastNameLabel;
private JTextField lastNameText;
private JLabel SSNLabel;
private JTextField SSNText;
private JLabel birthdayLabel;
private JTextField birthdayText;
private JLabel employeeTypeLabel;
private JComboBox<String> employeeTypeCombo;
private JLabel departmentNameLabel;
private JTextField departmentNameText;
private JLabel grossSalesLabel;
private JTextField grossSalesText;
private JLabel commissionRateLabel;
private JTextField commissionRateText;
private JLabel baseSalaryLabel;
private JTextField baseSalaryText;
private JLabel bonusLabel;
private JTextField bonusText;
private JLabel hoursLabel;
private JTextField hoursText;
private JLabel wageLabel;
private JTextField wageText;
private JLabel weeklySalaryLabel;
private JTextField weeklySalaryText;
private static final String[] employeeType = {"", "BasePlusCommissionEmployee", "CommissionEmployee",
"HourlyEmployee", "SalariedEmployee"};
// Constructor
public AddEmployeeDisplay()
{
super("Add a New Employee");
// Establish database connection
employeeQueries = new EmployeeQueries();
// Create the GUI
displayPanel = new JPanel();
employeeTypeLabel = new JLabel();
employeeTypeCombo = new JComboBox<String>(employeeType);
employeeTypeCombo.setMaximumRowCount(5);
firstNameLabel = new JLabel();
firstNameText = new JTextField();
lastNameLabel = new JLabel();
lastNameText = new JTextField();
SSNLabel = new JLabel();
SSNText = new JTextField();
birthdayLabel = new JLabel();
birthdayText = new JTextField();
departmentNameLabel = new JLabel();
departmentNameText = new JTextField();
grossSalesLabel = new JLabel();
grossSalesText = new JTextField();
commissionRateLabel = new JLabel();
commissionRateText = new JTextField();
baseSalaryLabel = new JLabel();
baseSalaryText = new JTextField();
bonusLabel = new JLabel();
bonusText = new JTextField();
hoursLabel = new JLabel();
hoursText = new JTextField();
wageLabel = new JLabel();
wageText = new JTextField();
weeklySalaryLabel = new JLabel();
weeklySalaryText = new JTextField();
clearButton = new JButton();
addEmpButton = new JButton();
setLayout(new FlowLayout(FlowLayout.CENTER, 10, 10));
setSize(500, 600);
setResizable(false);
displayPanel.setLayout(new GridLayout(16, 5, 4, 4));
employeeTypeLabel.setText("Employee Type: ");
displayPanel.add(employeeTypeLabel);
displayPanel.add(employeeTypeCombo);
employeeTypeCombo.addItemListener(
new ItemListener()
{
public void itemStateChanged(ItemEvent event)
{
if(event.getStateChange() == ItemEvent.SELECTED)
{
if(employeeTypeCombo.getSelectedItem().toString() == "BasePlusCommissionEmployee")
{
firstNameText.setEditable(true);
lastNameText.setEditable(true);
SSNText.setEditable(true);
birthdayText.setEditable(true);
departmentNameText.setEditable(true);
grossSalesText.setEditable(true);
commissionRateText.setEditable(true);
baseSalaryText.setEditable(true);
bonusText.setEditable(true);
hoursText.setEditable(false);
wageText.setEditable(false);
weeklySalaryText.setEditable(false);
}
if(employeeTypeCombo.getSelectedItem().toString() == "CommissionEmployee")
{
firstNameText.setEditable(true);
lastNameText.setEditable(true);
SSNText.setEditable(true);
birthdayText.setEditable(true);
departmentNameText.setEditable(true);
grossSalesText.setEditable(true);
commissionRateText.setEditable(true);
baseSalaryText.setEditable(false);
bonusText.setEditable(true);
hoursText.setEditable(false);
wageText.setEditable(false);
weeklySalaryText.setEditable(false);
}
if(employeeTypeCombo.getSelectedItem().toString() == "HourlyEmployee")
{
firstNameText.setEditable(true);
lastNameText.setEditable(true);
SSNText.setEditable(true);
birthdayText.setEditable(true);
departmentNameText.setEditable(true);
grossSalesText.setEditable(false);
commissionRateText.setEditable(false);
baseSalaryText.setEditable(false);
bonusText.setEditable(true);
hoursText.setEditable(true);
wageText.setEditable(true);
weeklySalaryText.setEditable(false);
}
if(employeeTypeCombo.getSelectedItem().toString() == "SalariedEmployee")
{
firstNameText.setEditable(true);
lastNameText.setEditable(true);
SSNText.setEditable(true);
birthdayText.setEditable(true);
departmentNameText.setEditable(true);
grossSalesText.setEditable(false);
commissionRateText.setEditable(false);
baseSalaryText.setEditable(false);
bonusText.setEditable(true);
hoursText.setEditable(false);
wageText.setEditable(false);
weeklySalaryText.setEditable(true);
}
}
}
}
);
firstNameLabel.setText("First Name: ");
displayPanel.add(firstNameLabel);
displayPanel.add(firstNameText);
firstNameText.setEditable(false);
lastNameLabel.setText("Last Name: ");
displayPanel.add(lastNameLabel);
displayPanel.add(lastNameText);
lastNameText.setEditable(false);
SSNLabel.setText("SSN: ");
displayPanel.add(SSNLabel);
displayPanel.add(SSNText);
SSNText.setEditable(false);
birthdayLabel.setText("Birthday: ");
displayPanel.add(birthdayLabel);
displayPanel.add(birthdayText);
birthdayText.setEditable(false);
departmentNameLabel.setText("Department Name: ");
displayPanel.add(departmentNameLabel);
displayPanel.add(departmentNameText);
departmentNameText.setEditable(false);
grossSalesLabel.setText("Gross Sales: ");
displayPanel.add(grossSalesLabel);
displayPanel.add(grossSalesText);
grossSalesText.setEditable(false);
commissionRateLabel.setText("Commission Rate: ");
displayPanel.add(commissionRateLabel);
displayPanel.add(commissionRateText);
commissionRateText.setEditable(false);
baseSalaryLabel.setText("Base Salary: ");
displayPanel.add(baseSalaryLabel);
displayPanel.add(baseSalaryText);
baseSalaryText.setEditable(false);
bonusLabel.setText("Bonus Amount: ");
displayPanel.add(bonusLabel);
displayPanel.add(bonusText);
bonusText.setEditable(false);
hoursLabel.setText("Hours: ");
displayPanel.add(hoursLabel);
displayPanel.add(hoursText);
hoursText.setEditable(false);
wageLabel.setText("Wage: ");
displayPanel.add(wageLabel);
displayPanel.add(wageText);
wageText.setEditable(false);
weeklySalaryLabel.setText("Weekly Salary: ");
displayPanel.add(weeklySalaryLabel);
displayPanel.add(weeklySalaryText);
weeklySalaryText.setEditable(false);
add(displayPanel);
clearButton.setText("CLEAR");
clearButton.addActionListener(
new ActionListener()
{
public void actionPerformed(ActionEvent evt)
{
clearButtonActionPerformed(evt);
}
}
);
add(clearButton);
addEmpButton.setText("Add New Employee");
addEmpButton.addActionListener(
new ActionListener()
{
public void actionPerformed(ActionEvent evt)
{
addEmpButtonActionPerformed(evt);
}
}
);
add(addEmpButton);
addWindowListener(
new WindowAdapter()
{
public void windowClosing(WindowEvent evt)
{
employeeQueries.close();
System.exit(0);
}
}
);
setVisible(true);
}
private void clearButtonActionPerformed(ActionEvent e)
{
// Clear the fields so that a new entry may be made.
SSNText.setText("");
SSNText.setEditable(false);
firstNameText.setText("");
firstNameText.setEditable(false);
lastNameText.setText("");
lastNameText.setEditable(false);
birthdayText.setText("");
birthdayText.setEditable(false);
employeeTypeCombo.setSelectedItem("");
departmentNameText.setText("");
departmentNameText.setEditable(false);
grossSalesText.setText("");
grossSalesText.setEditable(false);
commissionRateText.setText("");
commissionRateText.setEditable(false);
baseSalaryText.setText("");
baseSalaryText.setEditable(false);
bonusText.setText("");
bonusText.setEditable(false);
hoursText.setText("");
hoursText.setEditable(false);
wageText.setText("");
wageText.setEditable(false);
weeklySalaryText.setText("");
weeklySalaryText.setEditable(false);
}
// Handles call when addEmpButton is clicked
private void addEmpButtonActionPerformed(ActionEvent evt)
{
int result = 0;
StringJoiner joiner = new StringJoiner(System.lineSeparator());
if (employeeTypeCombo.getSelectedItem().toString() == "")
joiner.add("Employee type missing.");
if( SSNText.getText() == "" )
joiner.add("SSN missing.");
if( firstNameText.getText() == "" )
joiner.add("First name missing.");
if( lastNameText.getText() == "" );
joiner.add("Last name missing.");
if( birthdayText.getText() == "" );
joiner.add("Birthday missing.");
if( departmentNameText.getText() == "" );
joiner.add("Department name missing.");
if( joiner.length() != 0 )
{
JOptionPane.showMessageDialog(this,
joiner.toString(),
"Error in input",
JOptionPane.PLAIN_MESSAGE);
return;
}
// Add base plus commission employee data to BasePlusCommissionEmployee table
if (employeeTypeCombo.getSelectedItem().toString() == "BasePlusCommissionEmployee")
{
if( grossSalesText.getText() == "" )
joiner.add("Gross sales missing.");
if( commissionRateText.getText() == "" )
joiner.add("Commission rate missing.");
if( baseSalaryText.getText() == "" )
joiner.add("Base salary missing.");
if( bonusText.getText() == "" )
joiner.add("Bonus missing.");
if( joiner.length() != 0 )
{
JOptionPane.showMessageDialog(this,
joiner.toString(),
"Error in input",
JOptionPane.PLAIN_MESSAGE);
return;
}
result = 1;
employeeQueries.addBPCEmp(SSNText.getText(), grossSalesText.getText(), commissionRateText.getText(),
baseSalaryText.getText(), bonusText.getText());
}
// Add commission employee data to CommissionEmployee table
if (employeeTypeCombo.getSelectedItem().toString() == "CommissionEmployee")
{
if( grossSalesText.getText() == "" )
joiner.add("Gross sales missing.");
if( commissionRateText.getText() == "" )
joiner.add("Commission rate missing.");
if( bonusText.getText() == "" )
joiner.add("Bonus missing.");
if( joiner.length() != 0 )
{
JOptionPane.showMessageDialog(this,
joiner.toString(),
"Error in input",
JOptionPane.PLAIN_MESSAGE);
return;
}
result = 1;
employeeQueries.addCEmployee(SSNText.getText(), grossSalesText.getText(),
commissionRateText.getText(), bonusText.getText());
}
// Add hourly employee data to HourlyEmployee table
if (employeeTypeCombo.getSelectedItem().toString() == "HourlyEmployee")
{
if( hoursText.getText() == "" )
joiner.add("Hours missing.");
if( wageText.getText() == "" )
joiner.add("Wage missing.");
if( bonusText.getText() == "" )
joiner.add("Bonus missing.");
if( joiner.length() != 0 )
{
JOptionPane.showMessageDialog(this,
joiner.toString(),
"Error in input",
JOptionPane.PLAIN_MESSAGE);
return;
}
result = 1;
employeeQueries.addHEmployee(SSNText.getText(), hoursText.getText(),
wageText.getText(), bonusText.getText());
}
// Add salaried employee data to SalariedEmployee table
if (employeeTypeCombo.getSelectedItem().toString() == "SalariedEmployee")
{
if( weeklySalaryText.getText() == "" )
joiner.add("Weekly salary missing.");
if( bonusText.getText() == "" )
joiner.add("Bonus missing.");
if( joiner.length() != 0 )
{
JOptionPane.showMessageDialog(this,
joiner.toString(),
"Error in input",
JOptionPane.PLAIN_MESSAGE);
return;
}
result = 1;
employeeQueries.addSEmployee(SSNText.getText(), weeklySalaryText.getText(), bonusText.getText());
}
// Add Employee data to Employee table
result += 1;
employeeQueries.addEmp(SSNText.getText(), firstNameText.getText(), lastNameText.getText(), birthdayText.getText(),
employeeTypeCombo.getSelectedItem().toString(), departmentNameText.getText());
if(result == 2)
JOptionPane.showMessageDialog(this, "Employee added!", "Employee added", JOptionPane.PLAIN_MESSAGE);
else
JOptionPane.showMessageDialog(this, "Employee not added!", "Error", JOptionPane.PLAIN_MESSAGE);
// Clear the fields so that a new entry may be made.
clearButtonActionPerformed(evt);
}
public static void main(String args[])
{
AddEmployeeDisplay addEmployeeDisplay = new AddEmployeeDisplay();
}
}
答案 0 :(得分：0)
而不是说if(employeeTypeCombo.getSelectedItem().toString() == "CommissionEmployee")，而是说if(employeeTypeCombo.getSelectedItem().toString().equals("CommissionEmployee"))。
由于String是一个类，它使用方法来查看某些内容是否相等。它不是原始类型（如int或boolean），而是类似于您编程的类。