Swing in Java

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Swing
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a significant advantage: it becomes possible to change the way that a component is rendered without affecting any of its other aspects In other words, it is possible to plug in a new look and feel for any given component without creating any side effects in the code that uses that component Java provides look and feels, such as metal and Motif, that are available to all Swing users The metal look and feel is also called the Java look and feel It is a platform-independent look and feel that is available in all Java execution environments It is also the default look and feel For this reason, the default Java look and feel (metal) is used by the examples in this chapter Swing s pluggable look and feel is made possible because Swing uses a modified version of the classic model-view-controller (MVC) architecture In MVC terminology, the model corresponds to the state information associated with the component For example, in the case of a check box, the model contains a field that indicates if the box is checked or unchecked The view determines how the component is displayed on the screen, including any aspects of the view that are affected by the current state of the model The controller determines how the component reacts to the user For example, when the user clicks on a check box, the controller reacts by changing the model to reflect the user s choice (checked or unchecked) This then results in the view being updated By separating a component into a model, a view, and a controller, the specific implementation of each can be changed without affecting the other two For instance, different view implementations can render the same component in different ways without affecting the model or the controller Although the MVC architecture and the principles behind it are conceptually sound, the high level of separation between the view and the controller was not beneficial for Swing components Instead, Swing uses a modified version of MVC that combines the view and the controller into a single logical entity called the UI delegate For this reason, Swing s approach is called either the model-delegate architecture or the separable model architecture Therefore, although Swing s component architecture is based on MVC, it does not use a classical implementation of it Although the recipes in this chapter do not work directly with models or UI delegates, they are, nevertheless, present behind the scene One last point: Although Swing eliminates a number of the limitations present in the AWT, Swing does not replace the AWT Rather, Swing builds upon the foundation provided by the AWT Swing also uses the same event-handling mechanism as the AWT Therefore, the AWT is still a crucial part of Java
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A Swing GUI consists of two key items: components and containers However, this distinction is mostly conceptual because all containers are also components The difference between the two is found in their intended purpose As the term is commonly used, a component is an independent visual control, such as a push button or text field A container holds a group of components Thus, a container is a special type of component that is designed to hold other components Furthermore, in order for a component to be displayed, it must be held within a container Thus, all Swing GUIs will have at least one container Because containers are components, a container can also hold other containers This enables Swing to define what is called a containment hierarchy, at the top of which must be a top-level container
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In general, Swing components are derived from the JComponent class (The only exceptions to this are the four top-level containers, described in the next section) JComponent provides the functionality that is common to all components For example, JComponent supports the pluggable look and feel JComponent inherits the AWT classes Container and Component Thus, a Swing component is built on and compatible with an AWT component All of Swing s components are represented by classes defined within the package javaxswing The following table shows the class names for Swing components (including those used as containers):
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JApplet JColorChooser JDialog JFrame JList JOptionPane JProgressBar JScrollBar JSpinner JTextArea JToolBar JWindow JButton JComboBox JEditorPane JInternalFrame JMenu JPanel JRadioButton JScrollPane JSplitPane JTextField JToolTip JCheckBox JComponent JFileChooser JLabel JMenuBar JPasswordField JRadioButtonMenuItem JSeparator JTabbedPane JTextPane JTree JCheckBoxMenuItem JDesktopPane JFormattedTextField JLayeredPane JMenuItem JPopupMenu JRootPane JSlider JTable JToggleButton JViewport
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Notice that all component classes begin with the letter J For example, the class for a label is JLabel, the class for a push button is JButton, and the class for a check box is JCheckBox
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