java configuration issues , environment variables defined , but javac open

I have to find all the changed environment variables can be good java.exe running under DOS , but javac, display : javac is not an internal or external command, operable program is not


But the correct path into the open javac is possible, I obviously environmental variables not mistaken , ah, solving
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certainly no configuration or environment variables , it seems there is no other possibility. . .
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I do not have a new variable JAVA_HOME environment variable is possible, but with the % JAVA_HOME% \ bin; does not. . .
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sure the environment variable is not configured correctly .
1 Open My Computer - Properties - Advanced - Environment Variables

2. New system variables JAVA_HOME and CLASSPATH
variable name : JAVA_HOME
variable value : C: \ Program Files \ Java \ jdk1.7.0
variable name : CLASSPATH
variable values ​​:;.% JAVA_HOME% \ lib \ dt.jar;% JAVA_HOME% \ lib \ tools.jar;

3. Select " System Variables " in the variable named "Path" environment variable , double-click on the variable , the absolute path to the JDK installation path bin directory , and add to the value of the Path variable , and use the half-width semicolon and existing paths separated .
variable name : Path
variable value :% JAVA_HOME% \ bin;% JAVA_HOME% \ jre \ bin;
This is the java environment configuration , eclipse started directly after the configuration is complete , it will automatically configure the java environment
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landlord dos ( command prompt ) prompt window , hit the path command , which contains not see javac.exe directory where the file contains . Included , no problem ; otherwise, it can not.
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Oh no ! How do I ask to be added ? ? ? Thank you ! I was a rookie ! ! Thank you ! !