从Java开始的问题

Question

I got a problem starting out with java.

I set my path as

C:\\Program Files\\Java\\jdk1.8.0_102\\bin

and made the basic Hello.java notepad file. The problem is when I try to compile using:

C:\>javac

I get an error:

C:\\ is not recognized as an internal or external command, operable program or batch file.

What did I do wrong/What may be the cause of this?

Answer 1

The reason CMD gives that error is because you wrote C:> in the command, and that is unnecessary.

You simply need to write

javac Hello.java

And that compiles the file. When your CMD directory is that of the file. After compiling, run

java Hello

To run it

Answer 2

To start with, please, check, that java has been installed properly by typing in cmd:

java -version

Then, to compile some source file you need to provide this file as a parameter to java compiler. Like this:

javac Hello.java  

After that, you should get your code compiled and Hello.class file should appear.

Answer 3

At first try to set java home from your command prompt like this -

set CLASSPATH=C:\Program Files\Java\jdk1.8.0_102\bin

Then from terminal try to check whether it is installed properly, using -

java -version 

If everything is correct then you would see message like this -

java version "1.8.0_102"
Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)

Then you should set JAVA_HOME and PATH at your computer using this link