Using a button to call a method

Question

I am trying to get the button actionPerformed to call the connect method. But I get this error message on compile:
ras@2[nuvu]$ /usr/jdk/jdk1.6.0_04/bin/javac MonitorView2.java
MonitorView2.java:77: connectPort(java.lang.String) in MonitorView2 cannot be applied to ()
connectPort();
Can someone decipher this for me? Why can't this be done? thx
public class MonitorView2 extends JFrame {
     static SerialPort     serialPort;
     ByteArrayOutputStream asciiStream = new ByteArrayOutputStream();
     public MonitorView2()  {
          super("Monitor View 2");
     JPanel pane = new JPanel();
     setContentPane(pane);
     JButton testButton = new JButton("Test Comm On");
     pane.add(testButton);
     setSize(600, 300);
     setVisible(true);
     setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     class TestButtonHandler implements ActionListener  {
          public void actionPerformed(ActionEvent e) {
               System.out.println("Test button action works!");
               try
               String a = "33, 48, 48, 66, 67, 78, 49, 13"; //comm on;
               //ByteArrayOutputStream asciiStream = new ByteArrayOutputStream();
               byte[] buf = a.getBytes();
               asciiStream.write(buf);
               System.out.println("Buffer as a string");
               System.out.println(asciiStream.toString());
               System.out.println("Into array");
               byte[] b = asciiStream.toByteArray();
               for (int i=0; i<b.length; i++) {
               System.out.print((char) b);
               catch (Exception ex)
                    System.out.println("Exception has been thrown :" + ex);
               connectPort();
          testButton.addActionListener( new TestButtonHandler());
     public void connectPort ( String portName ) throws Exception {
     String defaultPort = "/dev/ttyS0";
     String                asciiString;
     Charset asciiCharset = Charset.forName("US-ASCII");
     CharsetDecoder decoder = asciiCharset.newDecoder();
     //byte[] b = {33, 48, 48, 66, 67, 78, 49, 13}; //comm on
     byte[] b = asciiStream.toByteArray();
     ByteBuffer asciiBytes = ByteBuffer.wrap(b);
     CharBuffer bChars = null;
     try {
          bChars = decoder.decode(asciiBytes);
     } catch (CharacterCodingException e) {
          System.err.println("Error decoding");
          System.exit(-1);
          System.out.println(bChars);
CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier(portName);
if ( portIdentifier.isCurrentlyOwned() )
System.out.println("Error: Port is currently in use");
else
CommPort commPort = portIdentifier.open(this.getClass().getName(),2000);
if ( commPort instanceof SerialPort )
SerialPort serialPort = (SerialPort) commPort;
serialPort.setSerialPortParams(4800,SerialPort.DATABITS_8,SerialPort.STOPBITS_1,SerialPort.PARITY_NONE);
InputStream in = serialPort.getInputStream();
OutputStream out = serialPort.getOutputStream();
(new Thread(new SerialReader(in))).start();
(new Thread(new SerialWriter(out))).start();
          out.write(b);
          out.flush();
else
System.out.println("Error: Only serial ports are handled by this example.");

Answer 1

Seriously, learn the basics.
Sun's [basic Java tutorial|http://java.sun.com/docs/books/tutorial/]
Sun's [New To Java Center|http://java.sun.com/learning/new2java/index.html].Includes an overview of what Java is, instructions for setting up Java, an intro to programming (that includes links to the above tutorial or to parts of it), quizzes, a list of resources, and info on certification and courses.
[http://javaalmanac.com|http://javaalmanac.com]. A couple dozen code examples that supplement [The Java Developers Almanac|http://www.amazon.com/exec/obidos/tg/detail/-/0201752808?v=glance].
jGuru. A general Java resource site. Includes FAQs, forums, courses, more.
JavaRanch. To quote the tagline on their homepage: "a friendly place for Java greenhorns." FAQs, forums (moderated, I believe), sample code, all kinds of goodies for newbies. From what I've heard, they live up to the "friendly" claim.
Bruce Eckel's [Thinking in Java|http://mindview.net/Books/DownloadSites] (Available online.)
Joshua Bloch's [Effective Java|http://www.amazon.com/Effective-Java-2nd-Joshua-Bloch/dp/0321356683/ref=pd_bbs_1?ie=UTF8&s=books&qid=1214349768&sr=8-1]
Bert Bates and Kathy Sierra's [Head First Java|http://www.amazon.com/exec/obidos/tg/detail/-/0596004656?v=glance].
James Gosling's [The Java Programming Language|http://www.bookpool.com/sm/0321349806]. Gosling is
the creator of Java. It doesn't get much more authoratative than this.