Check if jTextField input is an int or a string

Question

My code:

name = jTextFieldName.getText();
admin = Integer.parseInt(jTextFieldAdmin.getText());
anal = Integer.parseInt(jTextFieldAnalytical.getText());
creat = Integer.parseInt(jTextFieldCreative.getText());
finish = Integer.parseInt(jTextFieldFinisher.getText());

persons.addPerson(name, admin, anal, creat, finish);

persons.savePersons();

I want to make sure that name is a string and that admin, anal, creat and finish are ints between 0 and 30. I'm thinking that I should use try-catch, but I don't know exactly how to use it in this context. Any help appreciated!

Write down a separate method to validate all the values and only then add them. — Sudhanshu Umalkar, Mar 15 '13 at 09:17
You could try http://stackoverflow.com/questions/2749521/how-to-validate-a-jtextfield or http://stackoverflow.com/questions/4926745/validate-jtextfield — SeKa, Mar 15 '13 at 09:22

score 2 · Accepted Answer · answered Mar 15 '13 at 09:16

try catch isn't a bad way to handle this:

try {
    name = jTextFieldName.getText();
    admin = Integer.parseInt(jTextFieldAdmin.getText());
    anal = Integer.parseInt(jTextFieldAnalytical.getText());
    creat = Integer.parseInt(jTextFieldCreative.getText());
    finish = Integer.parseInt(jTextFieldFinisher.getText());

    persons.addPerson(name, admin, anal, creat, finish);

    persons.savePersons();
} catch (NumberFormatException e) {
    // One of the integer fields failed to parse. Do something to alert the user.
}

You can then also put some bounds checking in the try part. e.g.

if (admin < 0 || admin > 30) {
    // Problem. Alert the user.
}

score 2 · Answer 2 · answered Mar 15 '13 at 09:16

2

Why don't you use a JSpinner instead.

answered Mar 15 '13 at 09:16

tmwanik

1,643
14
20

score 1 · Answer 3 · answered Mar 15 '13 at 09:15

1

What you need is if-else which statisfies condition or ask user to input again if required.

ex -

if(admin<0 || admin>30){
  // ask user to input again.
}

answered Mar 15 '13 at 09:15

Subhrajyoti Majumder

40,646
13
77
103

score 1 · Answer 4 · answered Apr 22 '14 at 08:18

Use InputVerifier for JTextField, like below

public class MyInputVerifier extends InputVerifier {
    @Override
    public boolean verify(JComponent input) {
        String text = ((JTextField) input).getText();
        // Validate input here, like check int by try to parse it using Integer.parseInt(text), and return true or false
    }
}

// Set input verifier to the text field
jTextField.setInputVerifier(new MyInputVerifier());

Check if jTextField input is an int or a string

4 Answers4