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NOTE It is possible to add a border to nearly any Swing component, but this is not usually a good
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idea Most other Swing components, such as buttons, text fields, and lists, draw their own borders Specifying another border will cause a conflict The two exceptions to this rule are JLabel and JPanel This recipe uses only one type of border: the line border To create a line border, use the following factory method: static Border createLineBorder(Color lineColor) Here, lineColor specifies the color of the line used as the border For example, to draw a black border, pass ColorBLACK This method creates a line border with the default thickness Once you have created a border, you can assign it to a label by calling the setBorder( ) method It is shown here: void setBorder(Border border) Here, border specifies the border to use One thing to understand is that the same border can be used for multiple components That is, you don t need to create a new Border object for each label on which you will be setting the border Although specifying the horizontal alignment when a label is constructed is generally the easiest approach, Swing provides an alternative You can call the setHorizontalAlignment( ) method on the label after it has been constructed It is shown here: void setHorizontalAlignment(int horzAlign) Here, horzAlign must be one of the horizontal alignment constants just described You can also set the vertical alignment of a label To do so, call the setVerticalAlignment( ) method on the label It is shown here: void setVerticalAlignment(int vertAlign) The value passed to vertAlign must be one of these vertical alignment constants:
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SwingConstantsTOP SwingConstantsCENTER SwingConstantsBOTTOM
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Of course, text is centered top-to-bottom by default, so you will use CENTER only if you are returning the vertical alignment to its default There is one important thing to understand when setting a label s alignment: it won t necessarily have an effect For example, when you use FlowLayout, the label will be sized to fit its contents In this case, there is no difference between aligning to the top or bottom of the label In general, label alignment affects only those labels that are sized larger than their contents One way this can occur is when using a layout manager, such as GridLayout, that automatically adjusts the size of a label to fit an available space It can also happen when you specify a preferred component size that is larger than that needed to hold its contents To set the preferred size of a component, call setPreferredSize( )
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You can disable a label by calling setEnabled( ), shown here: void setEnabled(boolean state) When state is false, the label is disabled To enable the label, pass true When a label is disabled, it is shown in gray You can obtain or change the contents of a label at runtime For example, to set the text, call setText( ) To obtain the text, call getText( ) They are shown here: void setText(String newMsg) String getText( ) The string passed in newMsg is displayed within the label, replacing the previous string You can use a string containing HTML as the text to be displayed by a label To do so, begin the string with <html> When this is done, the text is automatically formatted as specified by the markup Using HTML offers one big advantage: it lets you display text that spans two or more lines
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The following example illustrates several features of JLabel Notice that the Change button lets you experiment with various alignment options Each time the button is pressed, the alignment of the text within the label is changed
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// Demonstrate JLabel import import import import javaxswing*; javaawt*; javaawtevent*; javaxswingborder*;
class LabelDemo { JLabel JLabel JLabel JLabel JLabel JLabel jlabSimple; jlabBorder; jlabIcon; jlabHTML; jlabDis; jlabAlign;
JButton jbtnChange; int next; LabelDemo() { next = 0; // Create a new JFrame container JFrame jfrm = new JFrame("Label Demo");
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