Java, A Beginner's Guide, 5th Edition, 5th Edition

Work with JTextField

Another commonly used control is JTextField. It enables the user to enter a line of text. JTextField inherits the abstract class JTextComponent, which is the superclass of all text components. JTextField defines several constructors. The one we will use is shown here:

JTextField(int cols)

Here, cols specifies the width of the text field in columns. It is important to understand that you can enter a string that is longer than the number of columns. It’s just that the physical size of the text field on the screen will be cols columns wide.

When you press enter when inputting into a text field, an ActionEvent is generated. Therefore, JTextField provides the addActionListener( ) and removeActionListener( ) methods. To handle ...