java.lang.NumberFormatException：对于输入字符串：“Male”

Question

I have been trying to run a SAVE process in a Java Swing app with the use of Hibernate. But i am getting the following exception every time.

java.lang.NumberFormatException: For input string: "Male"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:492)
at java.lang.Integer.parseInt(Integer.java:527)
at frames.user_info_1.saveUserDetails(user_info_1.java:258)
at frames.user_info_1.jButton1ActionPerformed(user_info_1.java:191)
at frames.user_info_1.access$100(user_info_1.java:17)
at frames.user_info_1$2.actionPerformed(user_info_1.java:147)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)

Here's the code which i used (a user registration).

public void saveUserDetails() {
    try {
        Transaction t = sess.beginTransaction();

        String fn = firstname.getText();
        String ln = lastname.getText();
        String nicno = nic.getText();
        String contact = contactno.getText();

        String gen = (String) jComboBox1.getSelectedItem();
        int gen1 = Integer.parseInt(gen);

        String un = username.getText();
        String pw = new String(password.getPassword());

        User u = new User();
        u.setFirstname(fn);
        u.setLastname(ln);
        u.setNic(nicno);
        u.setPhone(contact);

        Gender g = (Gender) sess.load(Gender.class, gen1);
        u.setGender(g);

        Login login = new Login();
        login.setUser(u);
        login.setUsername(un);
        login.setPassword(pw);

        String utype = "User";
        int utype1 = Integer.parseInt(utype);

        UserType utp = (UserType) sess.load(UserType.class, utype1);
        u.setUserType(utp);

        sess.save(u);
        sess.save(login);
        t.commit();

        System.out.println("User Successfully Saved!");
    } catch (NumberFormatException e) {
        System.out.println("Number Format Exception");
        e.printStackTrace();
    }

jComboBox1 is used to select the User's Gender and it is loaded with the values in the Gender table using a Criteria Search.

I guess the issue is with jComboBox. A help here would be really appreciated. Thanks in advance.

Answer 1

You are trying to parse a String value "Male" to an Integer. It is certainly not a valid number and thus the NumberFormatException .

int gen1 = Integer.parseInt(gen); // This is the problem

You could directly use the String in the load method.

Gender g = (Gender) sess.load(Gender.class, gen); // Use gen instead of gen1

Though even that would not solve your problem, unless gen is the primary key(the identifier for your Gender class). You need to give the id (primary key) as the second parameter to the load() method .

Answer 2

如果您的问题是关于使用Hibernate持久化枚举，您可以使用@Enumerated注释在您的pojo中使用枚举对象，但将其作为序数持久化

Answer 3

You should check the value entered by the user, suppose it is male (ie the user input), the code should be like this. The answer given by the user in jcombobox is jcom.

if(jcom.equals("Male"))
          gen=1;
else
          gen=0;