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This article mainly introduces "how to use the label components of the Java program graphical user interface". In the daily operation, I believe that many people have doubts about how to use the label components of the Java program graphical user interface. Xiaobian consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubts of "how to use the label components of the Java program graphical user interface". Next, please follow the editor to study!

Label component JLabel

The JLabel component represents a label, which is used to display information. In general, its display content cannot be changed directly.

Constant action public static final int LEFT tag text left alignment public static final int CENTER tag text alignment public static final int RIGHT tag text right alignment method public JLabel () throws HeadlessException creates a JLabel object public JLabel (String text) throws HeadlessException creates a tag and specifies the text content The default is left-aligned public Label (String text,int alignment) throws HeadlessException to create a label and specify the text content and alignment public JLabel (String text,Icon icon,int honzontalAlignment) to create a label with the specified text Image and horizontal aligned JLabel object public JLabel (Icon image,int honzontalAlignment) creates a JLabel instance with a specified image and horizontal alignment public void setText (String text) sets the text of the label public String getText () gets the text of the label public void setAlignment (int alignment) sets the alignment of the label public void setIcon (Icon icon) sets the specified image import javax.swing.* Import java.awt.*;public class Hello {public static void main (String [] args) {JFrame frame = new JFrame ("one"); JLabel label = new JLabel ("HELLO", JLabel.CENTER); frame.add (label); Dimension d = new Dimension (); d.setSize (500600); frame.setSize (d); frame.setBackground (Color.black); Point point = new Point (300200) Frame.setLocation (point); frame.setVisible (true);}}

Change the text style of JLabel

To change the font used, you can directly use the following methods defined in the Component class

Public void setFont (Font t)

Font class

Constant action public static final int BOLD text is displayed as bold public static final int ITALIC text display style is italic public static final int PLAIN text display style is common style method uses public Font (String name,int style,int size) to instantiate objects, specify display style and size public String getFontName () to get the name of the font

Demo

Import javax.swing.*;import java.awt.*;public class Hello {public static void main (String [] args) {JFrame frame = new JFrame ("one"); JLabel label = new JLabel ("HELLO", JLabel.CENTER); Font font = new Font ("Serief", Font.ITALIC+Font.BOLD,28); label.setFont (font); label.setForeground (Color.BLUE); frame.add (label) Dimension d = new Dimension (); d.setSize (500600); frame.setSize (d); frame.setBackground (Color.black); Point point = new Point (300200); frame.setLocation (point); frame.setVisible (true);}}

Set up pictures

ImageIcon class method

The method uses public ImageIcon (byte [] imageData) to set the byte array that holds the picture information to ImageIcon (String filename) create an ImageIcon object through the file name, public ImageIcon (String filename,String description), set the picture path and a simple description of the picture.

Demo

Import javax.swing.*;import java.awt.*;import java.io.File;public class Hello {public static void main (String [] args) {JFrame frame = new JFrame ("one"); String picPath = "C:\\ Users\\ 30452\ Desktop\\ 123.jpg"; Icon icon = new ImageIcon (picPath); JLabel lab = null; lab = new JLabel (icon,JLabel.CENTER); frame.add (lab) Frame.setSize (800800); frame.setBackground (Color.WHITE); frame.setLocation (300200); frame.setVisible (true);}}

At this point, the study on "how to use the label components of the Java graphical user interface" is over. I hope to be able to solve everyone's doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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