"'.class' expected" - Says BlueJ

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May 12th, 2005, 10:50 PM

sound7

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"'.class' expected" - Says BlueJ

I'm new to java and I am trying to make a program that adds the number 9 to the end of the textbox every second. I copied the code from various places and pasted it together. I think the majority is okay. I get a "'.class' expected" error on line seventeen. I am using BlueJ and java Tiger to compile. Anyway here is the code...

Code:

import java.awt.*;
import javax.swing.*;
public class GUI {
    public static void main(String[] Args){
        JFrame frame = new JFrame("Nine");
        frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
        frame.setResizable(false);
        frame.setBounds(265, 100, 535, 291);
        JPanel panel = new JPanel();
        JTextArea Nine = new JTextArea("999999999", 15, 47);
        Nine.setLineWrap(true);
        Nine.setWrapStyleWord(false);
        Nine.setEditable(false);
        JScrollPane ScrollNine = new JScrollPane(Nine);
        panel.add(ScrollNine);
        frame.setContentPane(panel);
        javax.swing.Timer TimerNine = new javax.swing.Timer(int 1000, new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                Nine.append(9);
            }
        });
        frame.setVisible(true);
        TimerNine.start();
    }
}

I am not sure if I need to import more things or what. Any help would be appreciated, thanks.

Last edited by sound7 : May 13th, 2005 at 10:44 AM. Reason: adding code tags

May 13th, 2005, 04:49 AM

MrFujin

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to use ActionListener you have to use

Code:

import java.awt.event.*

when you append 9, it should be as a string

Code:

Nine.append("9");

May 13th, 2005, 07:15 AM

Yawmark

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When you post code, please post it between [code] and [/code] tags (you can use the "code" button on the message posting screen). It makes your code much easier to read and prevents accidental markup from the forum software.

Also, please follow the standard Code Conventions for the Java™ Programming Language.

__________________
Yawmark
class Sig{public static void main(String...args){\u0066or(int
\u0020$:"vÌÈÊ\"¤¾ÀÊ²¬Æ\"v¤Î¤\"²¤¨¸¬Æ".to\u0043h\u0061rArray()
)System./*goto/*$/%\u0126//^\u002A\u002Fout.print((char)(($>>
+(~'"'&'#'))+('<'>>('\\'/'.')/\u002Array.const(~1)\*\u002F)));}}

May 13th, 2005, 10:43 AM

sound7

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Here is it in code tags now, I added the things, but I still get the same error. "'.class' expected" I get it on this line.

Code:

        javax.swing.Timer TimerNine = new javax.swing.Timer(int 1000, new ActionListener() {

Here is the code surrounding it.

Code:

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class Gui {
    public static void main(String[] Args){
        JFrame frame = new JFrame("Nine");
        frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
        frame.setResizable(false);
        frame.setBounds(265, 100, 535, 291);
        JPanel panel = new JPanel();
        
        JTextArea Nine = new JTextArea("999999999", 15, 47);
        Nine.setLineWrap(true);
        Nine.setWrapStyleWord(false);
        Nine.setEditable(false);
        
        JScrollPane ScrollNine = new JScrollPane(Nine);
        panel.add(ScrollNine);
        frame.setContentPane(panel);
        
        javax.swing.Timer TimerNine = new javax.swing.Timer(int 1000, new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                Nine.append("9");
            }
        });
        
        frame.setVisible(true);
        
        TimerNine.start();
    }
}

May 13th, 2005, 10:46 AM

Yawmark

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Don't declare the int.

PHP Code:


		
			
 javax.swing.Timer TimerNine = new javax.swing.Timer(1000, new ActionListener() {

//...

May 13th, 2005, 11:02 AM

sound7

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Compiling is taking a really long time. Does the timer need its own class? If the code is all right then is there an easier way to make a timer?

May 13th, 2005, 11:05 AM

Yawmark

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Compiling shouldn't take a long time simply because of the Timer class. Check your system and IDE settings.

May 13th, 2005, 11:18 AM

sound7

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I restarted the IDE and it worked. But when It compiled it found an error with

Code:

                Nine.append("9");

The message was really long so I took a screenshot of the error box. It's attached.

Attached Images

variableNine.gif (2.7 KB, 187 views)

May 13th, 2005, 11:29 AM

Yawmark

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Don't panic when you get an error message. It's trying to tell you something. Listen to it.

You can't access non-final local variables from anonymous inner classes. The error message you posted tells you exactly what's wrong and what you need to do to correct it.

#10

May 13th, 2005, 11:31 AM

sound7

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How do I declare it final?

#11

May 13th, 2005, 11:36 AM

Yawmark

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Quote:

How do I declare it final?

With the "final" keyword.

Example:

PHP Code:


		
			
final Object somethingOrOther = new Object();

The Java™ Tutorial - A practical guide for programmers

#12

May 13th, 2005, 11:42 AM

sound7

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Sorry to bother you again. Anyways now it says "cannot find symbol - method append(java.lang.String)" What does that mean?

Code:

                Nine.append("9");

#13

May 13th, 2005, 11:45 AM

Yawmark

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It means the compiler does not recognize the method you have written as a valid method. You've written something incorrectly.

#14

May 13th, 2005, 11:47 AM

Yawmark

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The following code is a direct modification of your code, changing only what was necessary to get it to a compileable state:

PHP Code:


		
			
 import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

public class Gui {

    public static void main(String[] Args){

        JFrame frame = new JFrame("Nine");

        frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);

        frame.setResizable(false);

        frame.setBounds(265, 100, 535, 291);

        JPanel panel = new JPanel();

        

        final JTextArea Nine = new JTextArea("999999999", 15, 47);

        Nine.setLineWrap(true);

        Nine.setWrapStyleWord(false);

        Nine.setEditable(false);

        

        JScrollPane ScrollNine = new JScrollPane(Nine);

        panel.add(ScrollNine);

        frame.setContentPane(panel);

        

        javax.swing.Timer TimerNine = new javax.swing.Timer(1000, new ActionListener() {

            public void actionPerformed(ActionEvent e) {

                Nine.append("9");

            }

        });

        

        frame.setVisible(true);

        

        TimerNine.start();

    }

}

#15

January 17th, 2006, 10:10 AM

kevinoc

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Hi everyone, I'm having a similar problem.

Code:

/**
 * Time class
 * 
 * <INSERT DESCRIPTION HERE>
 * 
 * @author: Kevin O'Connor
 * @version: 1
 */
public class Time
{
	// Variables (1.2)
	private int hours;
	private int minutes;

	// Constructors (1.3)	 
	public Time()
	{
		hours = 0;
		minutes = 0;
	}
	
	// Method: setHour (1.4)
	
	private void setHour(int timeHour)
	{
	    if((timeHour <= 23) && (timeHour >= 0)){
	        hours = hours + timeHour;
	    }
	}
	
	// Method: setMinute (1.5)
	private void setMinute(int timeMinute)
	{
	    if((timeMinute <= 59) && (timeMinute >= 0)){
	        minutes = minutes + timeMinute;
	    }
	}
	
	// Method: setTime (1.6)
	public void setTime(int timeHour, int timeMinute)
	{
	    setHour(int timeHour);
            setMinute(int timeMinute);
	}
}

The line highlighted in bold is where I'm getting the "'.class' expected" message. I'm trying to make a method call so I don't have to repeat the code. I would assume I have the same problem with the line after it.

Any help is appreciated.

"'.class' expected" - Says BlueJ

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