Java Doc for TextField.java in  » 6.0-JDK-Modules » j2me » java » awt » Java Source Code / Java DocumentationJava Source Code and Java Documentation

For example, the following image depicts a frame with four text fields of varying widths. Two of these text fields display the predefined text "Hello".

Here is the code that produces these four text fields:

 TextField tf1, tf2, tf3, tf4;
 // a blank text field
 tf1 = new TextField();
 // blank field of 20 columns
 tf2 = new TextField("", 20);
 // predefined text displayed
 tf3 = new TextField("Hello!");
 // predefined text in 30 columns
 tf4 = new TextField("Hello", 30);
 

Every time the user types a key in the text field, AWT sends two action events to the text field. The first one represents the key press and the second one, the key release. Each action event embodies the state of the system at the time that some action occurred. The properties of an action event indicate which key was pressed, what modifier keys were also pressed, and the time at which the event occurred.

Since the event is an instance of ActionEvent, the TextField class's processEvent method examines the event and passes it along to processActionEvent. The latter method redirects the event to any ActionListener objects that have registered an interest in action events generated by this text field.
version:
   1.59, 08/19/02
author:
   Sami Shaio
See Also:   java.awt.event.ActionEvent
See Also:   java.awt.TextField.processEvent
See Also:   java.awt.TextField.processActionEvent
since:
   JDK1.0

This method is not called unless action events are enabled for this component.

An echo character is useful for text fields where user input should not be echoed to the screen, as in the case of a text field for entering a password. true if this text field hasa character set for echoing;false otherwise.
See Also:   java.awt.TextField.setEchoChar
See Also:   java.awt.TextField.getEchoChar
since:
   JDK1.0

An echo character is useful for text fields where user input should not be echoed to the screen, as in the case of a text field for entering a password. the echo character for this text field.
See Also:   java.awt.TextField.echoCharIsSet
See Also:   java.awt.TextField.setEchoChar
since:
   JDK1.0

This method is not called unless action events are enabled for this component. Action events are enabled when one of the following occurs:

• An ActionListener object is registered via addActionListener.
• Action events are enabled via enableEvents.

An echo character is useful for text fields where user input should not be echoed to the screen, as in the case of a text field for entering a password.
Parameters:
  c - the echo character for this text field.
See Also:   java.awt.TextField.echoCharIsSet
See Also:   java.awt.TextField.getEchoChar
since:
   JDK1.1