Java program compiling error

Question

I started learning Java today. I installed jdk8, wrote a simple "Hello World" program and then executed this on command line:

c:\java>java hello.java

But it shows this error:

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

Then I also tried doing this:

c:\java>javac hello.java

Now it shows:

'javac' is not recognized ass an internal or external command,operable program or batch file

How to solve this and compile the Java program?

Possible duplicate of javac is not recognized as an internal or external command, operable program or batch file — thegauravmahawar
– thegauravmahawar, Commented Oct 3, 2015 at 19:13
You have to set jour JAVA_HOME variable to a JDK or add the complete path to javacin your commandline — Jens
– Jens, Commented Oct 3, 2015 at 19:14

Community · Accepted Answer · 2020-06-20 09:12:55Z

2

Firstly You need to Set JAVA_HOME variable.

You can set JAVA_HOME variable in your Windows as

Right click My Computer and select Properties.

On the Advanced tab, select Environment Variables, and then edit JAVA_HOME to point to where the JDK software is located, for example, C:\Program Files\Java\jdk1.8.0_05.

Then you need to compile .java file

Compile java program by

c:\java>javac Hello.java

It generate '.class` file. To run it use

c:\java> java Hello  // Not Hello.class

Where Hello.class is your class file name.

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Oct 3, 2015 at 19:15

ashiquzzaman33

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2 Comments

hotzst Over a year ago

The executable javac is part of the JDK. So make sure, that you have the JDK installed and the bin folder on your PATH. The java executable is part of the JRE, which is a smaller distribution. JRE stands for Java Runtime Environment while JDK is the Java Development Kit.

ashiquzzaman33 Over a year ago

@hotzst Please read OP question carefully, he wrote ` I've installed jdk8`.

SSH · Accepted Answer · 2015-10-03 19:21:51Z

you need to set JAVA_HOME variable...have a look here Setting JAVA_HOME

Set JAVA_HOME on a UNIX System

The JDK software is installed on your computer, for example, at /usr/jdk/jdk1.6.0_02. You can change this location.

Set JAVA_HOME.

Korn and bash shells:

export JAVA_HOME=jdk-install-dir
export PATH=$JAVA_HOME/bin:$PATH

Bourne shell:

JAVA_HOME=jdk-install-dir
export JAVA_HOME
PATH=$JAVA_HOME/bin:$PATH
export PATH

C shell:

setenv JAVA_HOME jdk-install-dir
setenv PATH $JAVA_HOME/bin:$PATH
export PATH=$JAVA_HOME/bin:$PATH
Change the permissions to enable you to run the GlassFish ESB Installer.

chmod 755 JavaCAPS.bin

Set JAVA_HOME on a Windows System

The JDK software is installed on your computer, for example, at C:\Program Files\Java\jdk1.6.0_02. You can move the JDK software to another location if desired.

Set JAVA_HOME:

Right click My Computer and select Properties.

On the Advanced tab, select Environment Variables, and then edit JAVA_HOME to point to where the JDK software is located, for example, C:\Program Files\Java\jdk1.6.0_02.

also you dont need to write .java when you are going to run your program i.e.

$javac abc.java

$java abc

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