使用 javac 和 java 编译的问题

Question

This problem is a bit embarrassing, and the solution is most likely on your web site somewhere, but I haven't been able to find it, so here goes: I've just installed Java to my C:\\ drive, and while the machine can find java it can't find javac, to wit:

C:\>java -version
java version "1.7.0_11"
Java(TM) SE Runtime Environment (build 1.7.0_11-b21)
Java HotSpot(TM) 64-Bit Server VM (build 23.6-b04, mixed mode)


C:\>javac -version
Error: Could not find or load main class com.sun.tools.javac.Main

and I get the above response even when I'm sitting IN the bin directory. I'm stumped.

I've tried updating both the PATH and JAVA_HOME environment variables, and I'm sorta stuck. Can anyone help? Note: I'm glad to go to the appropriate spot on your site, but I haven't been able to locate it, if you just point me to it I will consider myself helped, and thanks.

Answer 1

The problem may be because you might have installed JRE, so you are able to use java command

javac command is used compiling java programs, hence its for development

And for development you need to install JDK

Have a look at this :

What is the difference between JDK and JRE?

Answer 2

You need to specify the environment variable ie path. If you are using Windows 7, then Right click on my computer -> change settings -> advanced -> environment variable -> change path to bin folder of java ( C:\\Program Files\\Java\\jdk1.7.0_03\\bin ), no need to earse the prev path in path variable. Just give ";" at end, paste the link of the JDK's bin folder, and type ";".