设置类路径。 javac无法识别

Question

I am trying to run my java program from command line.

I read an article about setting up classpath, but I get an error of javac is not recognized as internal or external command. What should I do? (I dont want to set a permanent CLASSPATH) This is what I have done in my command line

D:\user> set path=%path%;C:\Program Files\Java\1.7.0_07\bin

D:\user> cd testing

D:\user\testing> javac firstProgram.java
'javac' is not recognized as an internal or external command,
operable program or batch file.

Thank you

Answer 1

Assuming that the PATH is correct ¹ , the most likely cause is that you have a JRE installation ... and a JRE doesn't include a java compiler. You need a JDK installation if you want to compile from the command line.

(You can confirm this by looking in the C:\\Program Files\\Java\\1.7.0_07\\bin directory to see if it contains a javac.exe file. A JRE won't ...)

Where can I find the Java compiler to download..

You need to download one of the JDK installers; see http://www.oracle.com/technetwork/java/javase/downloads/index.html

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^{1 - I don't think quotes are required in a PATH variable on Windows. At least that's what various examples that Google found for me seem to imply. But I've never really understood the logic behind quoting in Windows ...}

Answer 2

Better do it in Environmental variable and check it!

Answer 3

Its an issue related to Program Files .

First make sure that your JDK Folder is installed in Program Files or Program Files(x86) or any other folder.

Then you should use the path of bin folder in " ". Because command prompt does break the string at space. When you will write it in " " then it will take is as a whole String.

You try these commands

set path=%path%;"C:\Program Files\Java\1.7.0_07\bin"

or

set path=%path%;"C:\Program Files(x86)\Java\1.7.0_07\bin"

It might help you to get out of this.

Answer 4

try below command is recognized from command prompt C:\\Program Files\\Java\\1.7.0_07\\bin\\javac ab.java

This is just to verify your javac

Answer 5

Here's how you can set the path temporary, meaning if you close and reopen "command prompt" you will have to set the path again.

Assuming the path is C:\\Program Files\\Java\\jdk1.6.0\\bin

TYPE IN C:\\Program Files\\Java\\jdk1.6.0\\bin AND HIT ENTER that's it.

Answer 6

命令D:\\user\u0026gt; set path=%path%;C:\\Program Files\\Java\\1.7.0_07\\bin对我来说效果很好

Answer 7

Adding few more information to this:

Please check the version of JDK and JRE installed on your computer. Recently I faced the same problem even after setting the PATH. It gives the error "javac - command is not recognised"

Solution is there must be similar versions of JDK as well as JRE

Eg: JDK 1.7.75 along with JRE 1.7.75