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Easy Learn Java: Programming Articles, Examples and Tips - Page 376


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Text

Go to all tips in Swing, AWT
If you work with text, you need to know about the following user interface text components.
Component Lines Style Use
JLabel 1 plain or HTML "page" and/or an icon plain or HTML For displaying a fixed line of text. Can be HTML
JTextField 1 plain For entering or displaying one line of plain text.
JFormattedTextField 1 plain Added in SDK 1.4, JFormattedTextField is a subclass of JTextField for which the type of entry may be specified. For example, a field can be constructed to only accept integer values.
JPasswordField 1 plain For entering one line of plain text that displays a symbol instead of the characters, ie, for entering passwords. Subclass of JTextField.
JTextArea many plain For entering or displaying multiple lines of plain text. Put it into a JScrollPane to add scrolling.

Advanced text components

For display of formatted documents, you might use JEditorPane (for displaying plain, HTML, or RTF text) or JTextPane, which extends JEditorPane to allow embedded images and components.

Additional Text features

  • Font.
  • Text graphics (The Graphics drawString method).
  • Summary - Strings.
  • Newline Characters.


comments? | Printer Friendly Page  Send to a Friend | Score: 0
Posted by jalex on Wednesday, June 22, 2005 (00:00:00) (2392 reads)

Where to declare components

Go to all tips in Swing, AWT Components are typically declared in one of several places:

Field variables

Some components should be declared as field variables (instance variables, member variables). This is the appropriate place to declare components which must be referenced after the interface is constructed. Typically these are text fields or text areas, check boxes, etc. Those components whose values must be gotten or set.

Local variables

Local variables should be used for components which are never referenced after the interface is constructed. Typically these are panels for holding components, buttons (whose interaction is thru their listeners), ... Local variables disappear when the method they are in returns, but the component will continue to exist if it has been added to the interface.

Anonymous

Anonymous creation is typical with labels, which can be created and added in one step and never assigned to a variable. Of course, if the appearance (font, alignment, ...) must be changed, then they should be put in a local variable. Some programs use labels for output (not a good idea), and in this case they should be field variables. Example
content.add(new JLabel("Look at this"));


comments? | Printer Friendly Page  Send to a Friend | Score: 0
Posted by jalex on Tuesday, June 21, 2005 (00:00:00) (2371 reads)

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