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As explained in Overview of Swing, the Swing classes and interfaces are packaged in javaxswing Thus, any program that uses Swing must import this package All Swing applications must have a heavyweight container at the top of the containment hierarchy This top-level container holds all other containers and components associated with the application A Swing application will typically use an instance of JFrame as the top-level container JFrame inherits the following AWT classes: Component, Container, Window, and Frame It defines several constructors The one used by this recipe is shown here: JFrame(String name) The title of the window is passed in name The size of the frame can be set by calling setSize( ), shown next: void setSize(int width, int height) The width and height parameters specify the width and height of the window in pixels By default, when a top-level window is closed (such as when the user clicks on the close box), the window is removed from the screen, but the application is not terminated While this default behavior is useful in some situations, it is not what is needed for most applications Instead, you will usually want the entire application to terminate when its toplevel window is closed There are a couple of ways to achieve this The easiest way is to call setDefaultCloseOperation( ) Its general form is shown here: void setDefaultCloseOperation(int what) The value passed in what determines what happens when the window is closed Here are the valid values: JFrameDISPOSE_ON_CLOSE JFrameEXIT_ON_CLOSE JFrameHIDE_ON_CLOSE JFrameDO_NOTHING_ON_CLOSE These constants are declared in WindowConstants, which is an interface declared in javaxswing that is implemented by JFrame and defines many constants related to Swing To cause the program to terminate when its top-level window is closed, use EXIT_ON_CLOSE You create a Swing component by instantiating one of Swing s component classes Swing defines many component classes that support push buttons, check boxes, text fields, and so on This recipe uses only one of those classes: JLabel This is Swing s simplest component because it does not accept user input Instead, it simply displays information, which can consist of text, an icon, or a combination of both The label used by this recipe contains only text JLabel defines several constructors The one used here is: JLabel(String str) This creates a label that displays the string passed in str (See Work with JLabel for more information on labels)
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After you have a created a component, it must be added to a container In this case, it will be added to the application s top-level container All top-level containers have a content pane in which components are stored Thus, to add a component to a frame, you must add it to the frame s content pane Beginning with Java 5, this is accomplished by calling add( ) on the JFrame reference This causes the component to be added to the content pane associated with the JFrame (See the historical note that follows) The add( ) method has several versions The one used by the program is shown here: Component add(Component comp) When the frame is made visible, comp will also be displayed Its position will be determined by the layout manager By default, the content pane associated with a JFrame uses a border layout This version of add( ) adds the component to the center location Other versions of add( ) enable you to specify one of the border regions When a component is added to the center, its size is automatically adjusted to fit the size of the center To display the frame (and the components that it contains), you must call setVisible( ), shown here: void setVisible(boolean show) If show is true, the frame is displayed If show is false, the frame is hidden By default, a JFrame is invisible, so setVisible(true) must be called to display it There is a very important constraint that must be adhered to when using Swing All interaction with Swing s visual components must take place through the event-dispatching thread rather than on the main thread of the application This includes the initial construction of the GUI Here s why: In general, Swing programs are event-driven For example, when a user interacts with a component, an event is generated An event is passed to the application by calling an event handler defined by the application This means that the handler is executed on the event-dispatching thread provided by Swing and not on the main thread of the application Thus, although event handlers are defined by your program, they are called on a thread that was not created by your program To avoid problems (such as two different threads trying to update the same component at the same time), all Swing GUI components must be created and updated from the event-dispatching thread, not the main thread of the application However, main( ) is executed on the main thread Thus, it cannot directly instantiate a Swing GUI Instead, the program must create a Runnable object that executes on the event-dispatching thread, and have this object create the GUI To enable the GUI code to be created on the event-dispatching thread, you must use one of two methods that are defined by the SwingUtilities class These methods are invokeLater( ) and invokeAndWait( ) They are shown here: static void invokeLater(Runnable obj) static void invokeAndWait(Runnable obj) throws InterruptedException, InvocationTargetException Here, obj is a Runnable object that will have its run( ) method called by the event-dispatching thread The difference between the two methods is that invokeLater( ) returns immediately, but invokeAndWait( ) waits until objrun( ) returns You can use these methods to call a method
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