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Although this example is a Swing application, the same basic procedure used to set the layout manager also applies to Swing applets For example, to change the layout manager for the content pane associated with a JApplet container, simply call setLayout( ) on the JApplet instance
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Work with JLabel
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Key Ingredients
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Classes and Interfaces javaxswingborderBorderFactory javaxswingJLabel Methods static Border createLineBorder(color lineColor) String getText( ) void setBorder(Border border) void setDisabledIcon(Icon disIcon) void setEnabled(boolean state) void setHorizontalAlignment(int horzAlign) void setVerticalAlignment(int vertAlign) void setText(String msg)
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javaxswingIcon javaxswingImageIcon
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JLabel creates a Swing label It is Swing s simplest component because it does not respond to user interaction Although JLabel is very easy to use, it does support many features and it allows a substantial amount of customization, making it possible to create very sophisticated labels For example, a label s contents can be aligned horizontally and vertically, a label can use HTML, it can be disabled, and it can contain an icon A label can also have a border Frankly, the inherent simplicity of JLabel makes it easy to overlook its more subtle features This recipe demonstrates how to create and manage various types of JLabels
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Step-by-Step
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To create and manage a Swing label involves these steps: 1 Create an instance of JLabel, specifying the text and/or icon that will be displayed within the label You can also specify the horizontal alignment if desired 2 To put a border around a label, call setBorder( ) 3 To align the contents of the label vertically, call setVerticalAlignment( ) To set the horizontal alignment after the label has been constructed, call setHorizontalAlignment( ) 4 To disable/enable a label, call setEnabled( )
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8:
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Swing
5 To change the text within a label, call setText( ) To obtain the text within a label, call getText( ) 6 To use HTML within a label, begin the text with <html>
Discussion
JLabel defines several constructors They are shown here: JLabel( ) JLabel(Icon icon) JLabel(String str) JLabel(Icon icon, int horizAlign) JLabel(String str, int horizAlign) JLabel(String str, Icon icon, int horzAlign) Here, str and icon are the text and icon used for the label By default, the text and/or icon in a label is left-aligned You can change the horizontal alignment by specifying the horzAlign parameter It must be one of the following values:
SwingConstantsLEFT SwingConstantsCENTER SwingConstantsTRAILING SwingConstantsRIGHT SwingConstantsLEADING
The SwingConstants interface defines several constants that relate to Swing This interface is implemented by JLabel (and several other components) Thus, you can also refer to these constants through JLabel, such as JLabelRIGHT Notice that icons are specified by objects of type Icon, which is an interface defined by Swing The easiest way to obtain an icon is to use the ImageIcon class ImageIcon implements Icon and encapsulates an image Thus, an object of type ImageIcon can be passed as an argument to the Icon parameter of JLabel s constructor There are several ways to provide the image, including reading it from a file or downloading it from a URL Here is the ImageIcon constructor used by this recipe: ImageIcon(String lename) It obtains the image in the file named filename You can put a border around a label Borders are helpful when you want to clearly show the extents of the label All Swing borders are instances of the javaxswingborderBorder interface Although it is possible to define your own borders, you won t usually need to because Swing provides several predefined border styles, which are available through javaxswingBorderFactory This class defines several factory methods that create various types of borders, ranging from simple line borders to beveled, etched, or matte borders You can also create a titled border, which includes a short caption embedded in the border, or an empty border, which is an invisible border Empty borders are useful when a gap around a component is desired
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