Thread: Please help me! i am unable to compile and execute java files in command prompt

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\Users\Sunanda>set Path=C:\Program Files\Java\jdk1.7.0_11\bin

C:\Users\Sunanda>set HomePath=C:\Program Files\Java\jdk1.7.0_11\bin

C:\Users\Sunanda>javac HelloTest.java
javac: file not found: HelloTest.java
Usage: javac <options> <source files>
use -help for a list of possible options

C:\Users\Sunanda>java HelloTest
Error: Could not find or load main class HelloTest

C:\Users\Sunanda>javac FirstExample.java
javac: file not found: FirstExample.java
Usage: javac <options> <source files>
use -help for a list of possible options

C:\Users\Sunanda>set Path=C:\Program Files\Java\jdk1.7.0_11\bin

C:\Users\Sunanda>set HomePath=C:\Program Files\Java\jdk1.7.0_11

C:\Users\Sunanda>javac HelloTest.java
javac: file not found: HelloTest.java
Usage: javac <options> <source files>
use -help for a list of possible options

C:\Users\Sunanda>javac -d HelloTest.java
javac: directory not found: HelloTest.java
Usage: javac <options> <source files>
use -help for a list of possible options

C:\Users\Sunanda>cd Documents

C:\Users\Sunanda\Documents>cd NetBeansProjects

C:\Users\Sunanda\Documents\NetBeansProjects>cd JavaApplication1

C:\Users\Sunanda\Documents\NetBeansProjects\JavaAp plication1>set Path=C:\Program
Files\Java\jdk1.7.0_11\bin

C:\Users\Sunanda\Documents\NetBeansProjects\JavaAp plication1>set HomePath=C:\Pro
gram Files\Java\jdk1.7.0_11

C:\Users\Sunanda\Documents\NetBeansProjects\JavaAp plication1>javac HelloTest.jav
a
javac: file not found: HelloTest.java
Usage: javac <options> <source files>
use -help for a list of possible options

C:\Users\Sunanda\Documents\NetBeansProjects\JavaAp plication1>javac
Usage: javac <options> <source files>
where possible options include:
-g Generate all debugging info
-g:none Generate no debugging info
-g:{lines,vars,source} Generate only some debugging info
-nowarn Generate no warnings
-verbose Output messages about what the compiler is doing
-deprecation Output source locations where deprecated APIs are u
sed
-classpath <path> Specify where to find user class files and annotati
on processors
-cp <path> Specify where to find user class files and annotati
on processors
-sourcepath <path> Specify where to find input source files
-bootclasspath <path> Override location of bootstrap class files
-extdirs <dirs> Override location of installed extensions
-endorseddirs <dirs> Override location of endorsed standards path
-proc:{none,only} Control whether annotation processing and/or compil
ation is done.
-processor <class1>[,<class2>,<class3>...] Names of the annotation processors
to run; bypasses default discovery process
-processorpath <path> Specify where to find annotation processors
-d <directory> Specify where to place generated class files
-s <directory> Specify where to place generated source files
-implicit:{none,class} Specify whether or not to generate class files for
implicitly referenced files
-encoding <encoding> Specify character encoding used by source files
-source <release> Provide source compatibility with specified release

-target <release> Generate class files for specific VM version
-version Version information
-help Print a synopsis of standard options
-Akey[=value] Options to pass to annotation processors
-X Print a synopsis of nonstandard options
-J<flag> Pass <flag> directly to the runtime system
-Werror Terminate compilation if warnings occur
@<filename> Read options and filenames from file


C:\Users\Sunanda\Documents\NetBeansProjects\JavaAp plication1>javac -g HelloTest.
java
javac: file not found: HelloTest.java
Usage: javac <options> <source files>
use -help for a list of possible options

C:\Users\Sunanda\Documents\NetBeansProjects\JavaAp plication1>cd src

C:\Users\Sunanda\Documents\NetBeansProjects\JavaAp plication1\src>cd javaapplicat
ion1

C:\Users\Sunanda\Documents\NetBeansProjects\JavaAp plication1\src\javaapplication
1>javac HelloTest.java

C:\Users\Sunanda\Documents\NetBeansProjects\JavaAp plication1\src\javaapplication
1>java HelloTest
Exception in thread "main" java.lang.NoClassDefFoundError: HelloTest (wrong name
: javaapplication1/HelloTest)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java :791)
at java.security.SecureClassLoader.defineClass(Secure ClassLoader.java:14
2)
at java.net.URLClassLoader.defineClass(URLClassLoader .java:449)
at java.net.URLClassLoader.access$100(URLClassLoader. java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java: 361)
at java.net.URLClassLoader$1.run(URLClassLoader.java: 355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.j ava:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:4 23)
at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:3 56)
at sun.launcher.LauncherHelper.checkAndLoadMain(Launc herHelper.java:482)


C:\Users\Sunanda\Documents\NetBeansProjects\JavaAp plication1\src\javaapplication
1>

..................This is the error that i encountered

The last attempt it actually compiled, then threw an exception when it was run... Post your source code so we can see what the problem is

Why are you compiling at the command prompt anyway? If you're writing the code in netbeans it makes far more sense to build the project from within netbeans...

Originally Posted by Hammet27

Why are you compiling at the command prompt anyway? If you're writing the code in netbeans it makes far more sense to build the project from within netbeans...

I think it makes sense to learn how to compile and run from the command line even if using an IDE. This understanding *will* be useful and in fact necessary at some point.

Originally Posted by curmudgeon

I think it makes sense to learn how to compile and run from the command line even if using an IDE. This understanding *will* be useful and in fact necessary at some point.

Agreed, javac and java commands should be learnt and understood... I would actually recommend starting the learning process with just a text editor (Sublime Text 2, or Notepad++ are good) to write your source and compiling from the command line... Keeps the focus on learning the language instead of "how do I use this damn IDE?"