11 JComponent

SWING CLASS Object Oriented Programming

Advanced Object-Oriented Concepts (Part 1)

JComponent ClassAll Swing components except top-level containers whose names begin with Jdescend from the JComponent class (e.g., JPanel, JScrollPane, and JButton).

Events and Event Handling*


JComponent ClassThe JComponent class provides the following functionality to its descendants: Tool tipsPainting and bordersApplication-wide pluggable look and feelCustom propertiesSupport for layoutSupport for accessibilitySupport for drag and dropDouble bufferingKey bindings



JLabel ClassA JLabel object can display either text or an image, or both. It cannot react to input events but is instead commonly used to provide a label identifier for a nearby object that does.The JLabel class uses three constants to align the component horizontally.JLabel.LEFTJLabel.RIGHTJLabel.CENTER



JTextComponent ClassThe JTextComponent class provides a base class for Swing components that handle editable text. It provides the functionalities for entering and editing text informationnearly all the features of a text editor. JTextComponent has three direct subclassesJTextField, JTextArea, and JEditorPane.



JTextComponent ClassJTextField provides a component for entering and editing a single line of text.A JTextArea object displays multiple lines of text in a single font and style and optionally allows the user to edit the text. JTextArea does not handle scrolling, but implements the swing Scrollableinterface.



JList ClassJList class is used to display a list of items, such as list of students, a list of files, and so forth. A JList object is constructed in a manner similar to the way a JComboBox object is constructed, that is, by passing an array of String.



JComboBox ClassThe JComboBox is a component that combines two features: display area showing an option, and a list box containing additional options.



JScrollPane ClassThe JScrollPane container can hold components that require more display area than they have been allocated.



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11 JComponent

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