JLabel Notice Bar text Scrolling effect

The first thing to grasp is a concept: a string of pixels in the computer screen, for example, to take a jlabel inside the text occupied by the width and height, the method is as follows: (mainly used FontMetrics class)

import　java.awt.FontMetrics;
import　javax.swing.JLabel;
JLabel　label　=　new　JLabel("test　Label　");
FontMetrics　metrics　=　label.getFontMetrics(label.getFont());
int　textH　=　metrics.getHeight();　//字符串的高，只和字体有关
int　textW　=　metrics.stringWidth(label.getText());　//字符串的宽

Typically, a space occupies 3 pixels.

The specific code is as follows:

Test.java

import java.awt.BorderLayout;


import Java.awt.Color;


import java.awt.Dimension;


import Java.awt.FontMetrics;


import Java.awt.event.ComponentAdapter;


import java.awt.event.ComponentEvent;


import Javax.swing.JFrame;


import Javax.swing.JLabel;


import Javax.swing.JPanel;


public class Test {


private JFrame frame;


private String Scrolledtext;


private String str = "scrolling text Demo";


　　　　 /**　*//**


* Launch the application


* @param args


　　　　　 */


public static void Main (String args[]) {


try {


Test window = new test ();


window.frame.setVisible (TRUE);


} catch (Exception e) {


E.printstacktrace ();


　　　　　　　　 }


　　　　 }


　　　　 /**　*//**


* Create the application


　　　　　 */


public Test () {


Initialize ();


　　　　 }


　　　　 /**　*//**


* Initialize The contents of the frame


　　　　　 */


private void Initialize () {


frame = new JFrame ();


Frame.setbounds (100, 100, 500, 375);


frame.setdefaultcloseoperation (jframe.exit_on_close);


final JPanel panel = new JPanel ();


Panel.setbackground (Color.White);


panel.setlayout (New BorderLayout ());


Frame.getcontentpane (). Add (Panel, Borderlayout.north);


final JLabel label = new JLabel ();


label.settext ("New JLabel");


panel.add (label);


label_scrolledtext (label);


///When the form changes, you want to reset the label's scrolling text


Frame.addcomponentlistener (New Componentadapter () {


public void componentresized (ComponentEvent arg0) {


label_scrolledtext (label);


　　　　　　　　　　　　 }


　　　　　　　　 });


　　　　 }


　　　　 /**　*//**


* Scrolling Text


* @param label


　　　　　 */


public void Label_scrolledtext (JLabel label) {


this.scrolledtext = this.str;


Label.settext (Scrolledtext);


FontMetrics metrics = label.getfontmetrics (Label.getfont ());


int textw = Metrics.stringwidth (Label.gettext ());


Dimension framesize = Frame.getsize ();


for (int i = 1; I <= (FRAMESIZE.WIDTH-TEXTW)/3-3; i++)


Scrolledtext + = "";


Label.settext (Scrolledtext);


thread thread = new Thread (new Textchanger (label));


Thread.Start ();


　　　　 }


}


Textchanger.java


import Javax.swing.JLabel;


public class Textchanger implements Runnable {


Private JLabel label;


Public Textchanger (JLabel label) {


This.label = label;


　　　　 }


public void Run () {


try {


while (true) {


String Text = Label.gettext ();


if (Text.length () > 1) {


Text = text.substring (1, Text.length ()) + text.charat (0);


label.settext (text);


Label.repaint ();


　　　　　　　　　　　　　　　　 }


Thread.Sleep (50);


　　　　　　　　　　　　 }


} catch (Interruptedexception ex) {


Ex.printstacktrace ();


　　　　　　　　 }


　　　　 }


}

The final effect is as shown in the figure: