Text fields:

A text field is part of a GUI into which text can be typed by a user or which can be used to display information to the user. The JTextField objects are described by the class JTextField. These can be created using new. There are a number of constructors for text fields. Examples of their use are shown below:

JTextField txfA = new JTextField( );
JTextField txfB = new JTextField(24);
JTextField txfC = new JTextField("Text Field Type here");
JTextField txfD = new JTextField("This is for typing", 20);

The first line creates an empty text field. The second line creates a text field that has 24 columns. The third creates a text field that contains the string "Type here". The fourth line creates a text field consisting of 20 columns with the text "This is for typing" contained in the field.

There are a number of methods associated with the JTextField class. The getText method retrieves the text that has been placed into a text field. Thus,

JTextField txfC = new JTextField("Text Field Type here");

String text = txfC.getText( );

will place the string "Text Field Type here" into the string variable text. The JTextField class also contains methods that carry out actions such as retrieving text that has been highlighted by the user, selecting text depending on the start and end position of the text to be highlighted, and returning with the current length of the text field.

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