Thread: Help with Compiling

Please copy and paste here the full text of the error messages you get. Its easier to work with the data all here vs images.

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Class code:
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Wade>cd c:\documents and settings\wade\desktop\java in
21 days projects

C:\Documents and Settings\Wade\Desktop\Java in 21 days projects>javac volcanorob
ot.java
volcanorobot.java:14: unexpected type
required: variable
found : value
System.out.println("Status: " = status);
^
volcanorobot.java:15: unexpected type
required: variable
found : value
System.out.println("Speed: " = speed);
^
2 errors

C:\Documents and Settings\Wade\Desktop\Java in 21 days projects>

Application Code:
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Wade>cd c:\documents and settings\wade\desktop\java in
21 days projects

C:\Documents and Settings\Wade\Desktop\Java in 21 days projects>javac volcanoapp
lication.java
volcanoapplication.java:3: cannot find symbol
symbol : class VolcanoRobot
location: class VolcanoApplication
VolcanoRobot dante = new VolcanoRobot();
^
volcanoapplication.java:3: cannot find symbol
symbol : class VolcanoRobot
location: class VolcanoApplication
VolcanoRobot dante = new VolcanoRobot();
^
2 errors

C:\Documents and Settings\Wade\Desktop\Java in 21 days projects>

System.out.println("Status: " = status);

The = makes what is in the () an assignment statement vs the concatenation of a variable to a String. The compiler complains that the String to the left of the = is a value not a variable. Normally you use a + here.

VolcanoRobot dante = new VolcanoRobot();

The compiler can NOT find the definition for the VolcanoRobot class. Probably because of the previous errors.

Awesome! You were right about my "=" instead of "+" error. I had that error in there twice. I guess I was rushing cuz I lost the original code and had to type it again.

I successfully compiled the class, however, I still have the errors:

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Wade>cd c:\documents and settings\wade\desktop\java in
21 days projects

C:\Documents and Settings\Wade\Desktop\Java in 21 days projects>javac volcanoapp
lication.java
volcanoapplication.java:3: cannot find symbol
symbol : class VolcanoRobot
location: class VolcanoApplication
VolcanoRobot dante = new VolcanoRobot();
^
volcanoapplication.java:3: cannot find symbol
symbol : class VolcanoRobot
location: class VolcanoApplication
VolcanoRobot dante = new VolcanoRobot();
^
2 errors

C:\Documents and Settings\Wade\Desktop\Java in 21 days projects>



What am I overlooking?

cannot find symbol
symbol : class VolcanoRobot

The compiler can NOT find the definition for class VolcanoRobot.
Where is it?

It's in the same directory as the code I'm trying to compile, and the code I successfully compiled for the class.

What happens when you try to compile VolcanoRobot?
Are either of the classes in packages?
What is the command you use to compile the source files with? Does it set the classpath if the source files are in different packages.

Alright, I figured it out when you mentioned "classfile". I had to move the .class file to the directory set up for my environment variables. I just got it all compiled and can now move to the next steps in my book. Thanks a ton Norm!

Sorry about all the rookie questions, but now I'm trying to launch the application, and it's not working. Am I not supposed to use Command Prompt?

The command I use is:
"java VolcanoApplication" (which my book instructs me to use)

Here's the code:
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Wade> cd C:\Program Files\Java\jdk1.6.0_12\lib

C:\Program Files\Java\jdk1.6.0_12\lib>java volcanoapplication
Exception in thread "main" java.lang.NoClassDefFoundError: volcanoapplication (w
rong name: VolcanoApplication)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknow n Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
Could not find the main class: volcanoapplication. Program will exit.

C:\Program Files\Java\jdk1.6.0_12\lib>

I tried using the command:
"java VolcanoApplication.class" as well, but I get a slightly different error.

Is there an app somewhere in the JDK that I'm supposed to use to launch programs I create?

Java is case sensitive. Be sure to spell the class name the same everywhere you use it.
Try this. The class name without the extension:
java VolcanoApplication

I get a slightly different error

It's important that you post all the errors. The difference can show us what the problem is.

Sweet! I launched it and it performed the way it should. The issue was that I wasn't aware Java is case-sensitive. I'll be putting that on a mental sticky note. Thanks a ton Norm! And I have no more questions for this thread