Compare two JPasswordFields in Java before saving?

java swing jpasswordfield
user1922355 picture user1922355 · Dec 21, 2012 · Viewed 11.3k times · Source

Possible Duplicate:
How to check if JPassword field is null

While creating a login registration form, I am using two password fields. Before saving the data, I want to compare both fields; and if they match, then the data should be saved in file. If not it should open a dialog box. Please can anyone help me.

Answer

Reimeus picture Reimeus · Dec 21, 2012

The safest way would be to use Arrays.equals:

if (Arrays.equals(passwordField1.getPassword(), passwordField2.getPassword())) {
   // save data
} else {
  // do other stuff
}

Explanation: JPassword.getText was purposely deprecated to avoid using Strings in favor of using a char[] returned by getPassword.

When calling getText you get a String (immutable object) that may not be changed (except reflection) and so the password stays in the memory until garbage collected.

A char array however may be modified, so the password will really not stay in memory.

This above solution is in keeping with that approach.

Related questions

Why getText() in JPasswordField was deprecated?

I never thought before, only I used the method getPassword that returning an array of characters and I had seen the getText method was deprecated. But now that I think, why this method was deprecated?. The Java documentation explains: Deprecated. …

Read More
getText() vs getPassword()

I'm currently designing a login system for a make-believe company, right now all I have is the Main login, which needs a lot of cleaning up. Below is my login handler. private class LoginButtonHandler implements ActionListener { public void actionPerformed(ActionEvent …

Read More
Adding a password field - GUI

I have a JTextField. The same JTextField will be used to get both name and password of the user. So if it's getting the username, I would display what the user is typing on the Text field. But if he's …

Read More