JOptionPane.showMessageDialog的使用

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {

IUserDao iUser = new UserDaoImp();
String userName = this.jTextField1.getText();
String userId = this.jTextField2.getText();
int id = Integer.parseInt(userId);
User user = new User();
user.setName(userName);
user.setId(id);
boolean b = iUser.validate(user);
if(b)
JOptionPane.showMessageDialog(this, "验证成功");
else
JOptionPane.showMessageDialog(this, "数据不存在");
}

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {

String sex = "女";
IUserDao iUser = new UserDaoImp();
String userName = this.jTextField1.getText();
String userId = this.jTextField2.getText();
int id = Integer.parseInt(userId);
String age = this.jComboBox1.getSelectedItem().toString();
int age2 = Integer.parseInt(age);
if (this.jRadioButton1.isSelected())
sex = this.jRadioButton1.getText();
User newUser = new User(id, userName, sex, age2);
int j = iUser.insertOneUser(newUser);
if (j == 1)
JOptionPane.showMessageDialog(this, "注册成功");
else
JOptionPane.showMessageDialog(this,"此数据已经存在");
}