CODEWITHSUNDEEP
javaswingjtextfieldisnullorempty
Jesus Zavarce
Jesus Zavarce

Reputation: 1759

Swing: the initial String of JTextField is an empty String

About the constructor of JTextField, the javadoc says:

public JTextField()

Constructs a new TextField. A default model is created, the initial string is null, and the number of columns is set to 0.

But when I use this constructor, the method getText() of JTextField returns an empty String, for example:

boolean b = new JTextField().getText().isEmpty();  // returns true.

Why the value returned by getText() is an empty String instead of null?

Upvotes: 5

Views: 936

Answers (1)

hunter
hunter

Reputation: 4173

JTextField get the text from the Document , default implementation PlainDocument never returns null. even though you tried to call JTextField.setText(null), it will just clear the value of the Document content, but still getText will return empty string.

Upvotes: 7

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