What is the TextField class?

The TextField class is used to take one-line or multiple-line input from a user. The number of characters depends upon the maximum size of the TextField. The general syntax to create a TextField is as follows:

TextField textfield=new TextField(”label”, “input”, “size”, “constraint”)

The label defines the visual text displayed before the text box.

The input is the text entered by a user.

The size defines the maximum number of characters the TextField is capable of taking.

The constraint defines the TextField constants. These constants are listed below:

CONSTRAINT_MASK: It determines the constraint’s current value.

ANY: It takes any character as input.

EMAILADDR: It takes only a valid email address.

NUMERIC: It takes both positive and negative numbers.

PASSWORD: It hides the input while a user is entering data.

PHONENUMBER: It takes only valid phone numbers.

URL: It takes the valid address of a Web site.

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