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Easy Learn Java: Programming Articles, Examples and Tips - Page 345


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Java: JLabel

Go to all tips in Swing, AWT
Labels display fixed text or images on a GUI as information to the user, for example, as a label in front of a a JTextField, etc. You can have text (including HTML), an image, or both on a JLabel. A JLabel has a transparent background, so it will always match the container it is in.

JLabel Constructors

Assume the following declarations.
   String text;
   Icon   image;
   int    alignment; // JLabel.LEFT, JLabel.Center, or JLabel.RIGHT.
   
JLabel yourLabel = new JLabel(text);
JLabel yourLabel = new JLabel(text, alignment);
JLabel yourLabel = new JLabel(image);
JLabel yourLabel = new JLabel(image, alignment);
JLabel yourLabel = new JLabel(text, image, alignment);

Java Idiom

Because there is usually no need to refer to a JLabel after it has been added to a container, it is common to combine creation and adding the JLabel in one statement. For example.
p.add(new JLabel("Enter your ID:", JLabel.RIGHT));
is the same as
JLabel idLabel = new JLabel("Enter your ID:", JLabel.RIGHT);
. . .
p.add(idLabel);

HTML in JLabels

You may put HTML text in a JLabel. In this case the text should begin with and end with .

Related pages

The most user-friendly interfaces are usually obtained by using the default appearance. Altho the default is the most common, you might want to change the font size in some situations. Look at JLabel font and color if you really must make changes. A more common way to control the appearance of a JLabel is using HTML (see above).

It's also possible to dynamically change the text of a JLabel, ie, use it for output. This is not generally a good idea because it may change the size of the JLabel and therefore require a change in the layout of components. Using a JTextField is much better. JLabel setting text has information for how to do it tho.



1 comment | Printer Friendly Page  Send to a Friend | Score: 0
Posted by jalex on Wednesday, April 20, 2005 (00:00:00) (5305 reads)

Java: JLabel font and color

Go to all tips in Swing, AWT

The most user-friendly interfaces are usually obtained by using the default appearance (font, color, background), but there are cases where you want to change these.

Appearance: setting the font

The font of a JLabel can be changed like this.
JLabel title = new JLabel("Want a Raise?", JLabel.CENTER);
title.setFont(new Font("Serif", Font.BOLD, 4Cool);

Appearance: setting the text color

Use the setForeground method to set the text color.
JLabel title = new JLabel("Want a Raise?", JLabel.CENTER);
title.setForeground(Color.white);

Appearance: setting the background color

Because a JLabel's background is transparent, there is no effect from using the setBackground method. To make a new background, you need to create a JPanel with the appropriate color and put the label on that. For example
JLabel title = new JLabel("Want a Raise?");
title.setForeground(Color.white);
JPanel titlePanel = new JPanel();
titlePanel.setBackground(Color.blue);
titlePanel.add(title);  // adds to center of panel's default BorderLayout.


1 comment | Printer Friendly Page  Send to a Friend | Score: 5
Posted by jalex on Tuesday, April 19, 2005 (00:00:00) (43052 reads)

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