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I am a new learner for Java and recently I have installed JAVA SE JDK and set up system environment as follows:

ClassPath 

.;C:\Program Files\Java\jdk1.8.0_144\lib\tools.jar;C:\Program Files\Java\jdk1.8.0_144\lib\dt.jar

JAVA_HOME 

C:\Program Files\Java\jdk1.8.0_144

JRE_HOME 

C:\Program Files\Java\jre1.8.0_144 (I added this because fail to run java program)

JRE_HOME_141 

C:\Program Files\Java\jre1.8.0_141 (I added this because fail to run java program)

Path 

%JAVA_HOME%\bin;%JRE_HOME%\bin;%JRE_HOME_141%\bin;C:\ProgramData\Oracle\Java\javapath;%PATH%

I could compile my code using javac FirstProgram.java without problem but once i tried to run java FirstProgram.class, it shows this error message:

Error: could not find or load main class FirstProgram.java

I am using Windows 10 Pro.

Could anyone help me to solve this problem? Thank you you in advance.

soorapadman
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km.C
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  • This has nothing to do with the java installation, you can remove duplicate path variables. Please post `FirstProgram.java`. Also, do not rewrite by hand the error message you get, copy-paste it. The output you wrote is unlikely to be given by the `java` executable. – BackSlash Aug 23 '17 at 08:00
  • Please add your FirstProgram.java-Sourcecode – abc Aug 23 '17 at 08:00

1 Answers1

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but once i tried to run java FirstProgram.class, it shows this error message:- Error: could not find or load main class FirstProgram.java

You need to specify the full class name of the main class. Maybe FirstProgram. Maybe mypackage.FirstProgram. But not FirstProgram.class (that is the name the file the class is stored in, it will need to be present on the classpath) or FirstProgram.java (that is the name of the Java source code file, it is not needed at runtime).

Thilo
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