{"id":643,"date":"2022-07-09T10:01:26","date_gmt":"2022-07-09T10:01:26","guid":{"rendered":"https:\/\/www.kevingordon.org.uk\/kevwp4\/?p=643"},"modified":"2026-02-22T14:45:27","modified_gmt":"2026-02-22T14:45:27","slug":"getting-a-java-applet-to-work","status":"publish","type":"post","link":"https:\/\/www.kevingordon.org.uk\/kevwp4\/2022\/07\/09\/getting-a-java-applet-to-work\/","title":{"rendered":"Getting a Java Applet to work"},"content":{"rendered":"

I wrote a falling blocks game as a Java Applet many years ago. Java Applets don\u2019t work any more. I found this article here https:\/\/examples.javacodegeeks.com\/desktop-java\/swing\/java-swing-application-example\/<\/a> and with a few simple tweaks I can now run it as a Swing application. Here In take you through the steps in which I converted the Java Applet to a Java Swing Application.<\/p>\n

Add the Swing libraries to the import. From:
\nimport java.applet.Applet;
\n<\/code><\/p>\n

To:
\nimport javax.swing.*;
\n<\/code><\/p>\n

Extend a JPanel not an Applet. From:
\npublic class KevTris extends Applet implements KeyListener {
\n<\/code>
\nTo:
\npublic class KevTris extends JPanel implements KeyListener {
\n<\/code>
\nYou\u2019ll need a main method and a createAndShowGUI method. Hooking into your existing code as below. Add:
\n
\nprivate static void createAndShowGUI() {<\/code><\/p>\n

\/\/Make sure we have nice window decorations.<\/code><\/div>\n
JFrame.setDefaultLookAndFeelDecorated(true);<\/code><\/div>\n
\/\/Create and set up the window.<\/code><\/div>\n
JFrame frame = new JFrame(\"HelloWorldSwing\");<\/code><\/div>\n
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);<\/code><\/div>\n
\/\/Add Kevtris class<\/code><\/div>\n
JPanel panel = new KevTris();<\/code><\/div>\n
\/\/Run init() to do something<\/code><\/div>\n
((KevTris)panel).init();<\/code><\/div>\n
frame.getContentPane().add(panel);<\/code><\/div>\n
\/\/Display the window.<\/code><\/div>\n
frame.pack();<\/code><\/div>\n
frame.setVisible(true);<\/code><\/div>\n

}<\/code><\/p>\n

public static void main(String[] argv) {<\/code><\/p>\n

\/\/Schedule a job for the event-dispatching thread:<\/code><\/div>\n
\/\/creating and showing this application's GUI.<\/code><\/div>\n
javax.swing.SwingUtilities.invokeLater(new Runnable() {<\/code><\/div>\n
public void run() {<\/code><\/div>\n
createAndShowGUI();<\/code><\/div>\n
}<\/code><\/div>\n
});<\/code><\/div>\n

}<\/code><\/p>\n

Comment out contents of keyPressed:
\npublic void keyPressed(KeyEvent e) {<\/code><\/p>\n

\/\/ BlockAbstract tempBlock = (BlockAbstract) blockStack.peek();<\/code><\/div>\n
\/\/<\/code><\/div>\n
\/\/ if(e.getKeyCode() == KeyEvent.VK_LEFT) {<\/code><\/div>\n
\/\/ tempBlock.moveLeft(1);<\/code><\/div>\n
\/\/ debugMessages = \"went left\";<\/code><\/div>\n
\/\/ repaint((long) 0);<\/code><\/div>\n
\/\/ } else if(e.getKeyCode() == KeyEvent.VK_RIGHT) {<\/code><\/div>\n
\/\/ tempBlock.moveRight(1);<\/code><\/div>\n
\/\/ debugMessages = \"went right\";<\/code><\/div>\n
\/\/ repaint((long) 0);<\/code><\/div>\n
\/\/ } else if(e.getKeyCode() == KeyEvent.VK_DOWN) {<\/code><\/div>\n
\/\/ tempBlock.moveDown(1);<\/code><\/div>\n
\/\/ debugMessages = \"went down\";<\/code><\/div>\n
\/\/ repaint((long) 0);<\/code><\/div>\n
\/\/ } else if(e.getKeyCode() == KeyEvent.VK_UP) {<\/code><\/div>\n
\/\/ tempBlock.rotateRight();<\/code><\/div>\n
\/\/ debugMessages = \"rotated right\";<\/code><\/div>\n
\/\/ repaint((long) 0);<\/code><\/div>\n
\/\/ } else {<\/code><\/div>\n
\/\/ debugMessages = \"didn't recognise: \" + e.getKeyCode();<\/code><\/div>\n
\/\/ repaint((long) 0);<\/code><\/div>\n
\/\/ }<\/code><\/div>\n

}<\/code><\/p>\n

For detecting keys pressed; add your above code to init() method as following:<\/p>\n

InputMap im = getInputMap(WHEN_FOCUSED);
\nActionMap am = getActionMap();<\/code><\/p>\n

im.put(KeyStroke.getKeyStroke(KeyEvent.VK_UP, 0), \"onUp2\");
\nam.put(\"onUp2\", new AbstractAction() {<\/code><\/p>\n

@Override<\/code><\/div>\n
public void actionPerformed(ActionEvent e) {<\/code><\/div>\n
BlockAbstract tempBlock = (BlockAbstract) blockStack.peek();<\/code><\/div>\n
tempBlock.rotateRight();<\/code><\/div>\n
debugMessages = \"rotated right\";<\/code><\/div>\n
repaint((long) 0);<\/code><\/div>\n
}<\/code><\/div>\n

});<\/code><\/p>\n

im.put(KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, 0), \"onLeft\");
\nam.put(\"onLeft\", new AbstractAction() {<\/code><\/p>\n

@Override<\/code><\/div>\n
public void actionPerformed(ActionEvent e) {<\/code><\/div>\n
BlockAbstract tempBlock = (BlockAbstract) blockStack.peek();<\/code><\/div>\n
tempBlock.moveLeft(1);<\/code><\/div>\n
debugMessages = \"went left\";<\/code><\/div>\n
repaint((long) 0);<\/code><\/div>\n
}<\/code><\/div>\n

});<\/code><\/p>\n

im.put(KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, 0), \"onRight\");
\nam.put(\"onRight\", new AbstractAction() {<\/code><\/p>\n

@Override<\/code><\/div>\n
public void actionPerformed(ActionEvent e) {<\/code><\/div>\n
BlockAbstract tempBlock = (BlockAbstract) blockStack.peek();<\/code><\/div>\n
tempBlock.moveRight(1);<\/code><\/div>\n
debugMessages = \"went right\";<\/code><\/div>\n
repaint((long) 0);<\/code><\/div>\n
}<\/code><\/div>\n

});<\/code><\/p>\n

im.put(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, 0), \"onDown\");
\nam.put(\"onDown\", new AbstractAction() {<\/code><\/p>\n

@Override<\/code><\/div>\n
public void actionPerformed(ActionEvent e) {<\/code><\/div>\n
BlockAbstract tempBlock = (BlockAbstract) blockStack.peek();<\/code><\/div>\n
tempBlock.moveDown(1);<\/code><\/div>\n
debugMessages = \"went down\";<\/code><\/div>\n
repaint((long) 0);<\/code><\/div>\n
}<\/code><\/div>\n

});<\/code><\/p>\n

See a short video here: https:\/\/twitter.com\/digitaltechlabs\/status\/1545564299321565185?s=20&t=ARb997sRap4KYK3OAJQWtQ<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

I wrote a falling blocks game as a Java Applet many years ago. Java Applets don\u2019t work any more. I found this article here https:\/\/examples.javacodegeeks.com\/desktop-java\/swing\/java-swing-application-example\/ and with a few simple tweaks I can now run it as a Swing application. Here In take you through the steps in which I converted the Java Applet to […]<\/p>\n","protected":false},"author":2,"featured_media":659,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[3,7],"tags":[60,5,8,30,9],"class_list":["post-643","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technology","category-tutorials","tag-java","tag-technology","tag-tips","tag-tutorial","tag-tutorials"],"yoast_head":"\nGetting a Java Applet to work - Kev's Web<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.kevingordon.org.uk\/kevwp4\/2022\/07\/09\/getting-a-java-applet-to-work\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Getting a Java Applet to work - Kev's Web\" \/>\n<meta property=\"og:description\" content=\"I wrote a falling blocks game as a Java Applet many years ago. 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