Thread: Newb java problem

Hello guys,

I just started my first Java course and am finding it interesting, but am having some small issues. The following is an example provided by my course that I copied into Bluej:

importjava.io*;
public class VoiceExample {
public static void main(String[] args) {
// first comment
// Get the number of seconds from the user.
// Create a ConsoleReader object to simplify input.
ConsoleReader console = new ConsoleReader(System.in);
System.out.print("Please enter a number of seconds: ");
double sec = console.readDouble();

// second comment
// Calculate number of kilobytes.
final int KBYTE = 1024;
// 1 kb = 1024 bytes
final int VOICE_BYTES_PER_SECOND = 8000;
final int VOICE_KB_PER_SECOND = VOICE_BYTES_PER_SECOND / KBYTE;
double voiceKB = sec / VOICE_KB_PER_SECOND;

// third comment
// Print the result on the screen
System.out.println();
}

} // end of class VoiceExample

I copied it as follows:

importjava.io*;
public class VoiceExample
{
public static void main( String[] args) {
ConsoleReader console = new ConsoleReader(System.in);
System.out.print("Please enter the number of seconds: ");
double sec = console.readDouble();
final int KBYTE = 1024;
final int VOICE_BYTES_PER_SECOND = 8000;
final int VOICE_KB_PER_SECOND = VOICE_BYTES_PER_SECOND / KBYTE;
double voiceKB = sec / VOICE_KB_PER_SECOND;
System.out.println();
}
}

I get a "class, interface, or enum expected" error at the importjava.io*; line, but I'm sure there are other problems as well. Any experienced people with advice? I'd really appreciate it. Thanks alot.

Originally Posted by Tedstriker

I just started my first Java course and am finding it interesting, but am having some small issues. The following is an example provided by my course that I copied into Bluej:

importjava.io*;
 
public class VoiceExample {
  // ....
}

I get a "class, interface, or enum expected" error at the importjava.io*; line, but I'm sure there are other problems as well. Any experienced people with advice?

The error is telling you that this line is wrong, and if you look closely at it, you'll see why.

Notice the difference between your line, and mine?

import java.io*;
 
public class VoiceExample {
  // ....
}

Thanks for the help. I'm now getting a ";" expected error message on the import java.io*; line.

I second all that Mr. Beeblebrox has to say. Also, if you're not using an IDE, and I agree with you're not using one when just starting out, be sure to compile early and often, perhaps after each new line or two of code that you've added. Then if you find a compilation error, be sure to fix it before trying to add any more new code. I usually start out with a code "skeleton", mainly the class name and declaration, then compile, then add variables and constants, then compile, then add method skeletons (the method declarations without their bodies), then compile, then flesh out the methods one at a time,...

Thanks again, frustrating that the extra dot wasn't in the text. Oh well.

I know this is a complete newb thread and I appreciate your guys help. The next one is: "can't find symbol - class ConsoleReader"

Thanks for your patience, I look forward to hearing from you.

Originally Posted by Tedstriker

I know this is a complete newb thread and I appreciate your guys help. The next one is: "can't find symbol - class ConsoleReader"

The next big skill to master -- checking out the Java API. Do so and you'll see that ConsoleReader doesn't exist. Did you perhaps get this class from your instructor?

Thanks for the help guys,

Rather than keep posting error after error, I'm going to go back to the drawing board and try to figure this out, and review the course materials again. If I have any other issues I'll post back again. BTW this forum is awesome and I really find this stuff interesting. Thanks again.