📄 hellojws.java
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/* * HelloJWS.java is a 5.0 example that requires * no other files. */import javax.swing.*;import java.awt.Font;public class HelloJWS { /** * Create the GUI and show it. For thread safety, * this method should be invoked from the * event-dispatching thread. */ private static void createAndShowGUI() { //Make sure we have nice window decorations. JFrame.setDefaultLookAndFeelDecorated(true); //Create and set up the window. JFrame frame = new JFrame("HelloJWS"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Add the "HelloJWS" label. JLabel label = new JLabel(); label.setHorizontalAlignment(JLabel.CENTER); label.setFont(label.getFont().deriveFont(Font.PLAIN)); frame.add(label); //Set label text after testing for Java Web Start. String text = null; try { Class sm = javax.jnlp.ServiceManager.class; //If we reach this line, we're running in an environment //such as Java Web Start that provides JNLP services. text = "<html>You're running an application " + "using Java<font size=-2><sup>TM</sup></font> " + "Web Start!</html>"; } catch (java.lang.NoClassDefFoundError e) { //If no ServiceManager, we're not in Java Web Start. text = "<html>You're running an application, " + "but <b>not</b> using " + "Java<font size=-2><sup>TM</sup></font> " + "Web Start!</html>"; } label.setText(text); //Display the window. frame.pack(); frame.setVisible(true); } public static void main(String[] args) { //Schedule a job for the event-dispatching thread: //creating and showing this application's GUI. javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); }}⌨️ 快捷键说明
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