配置好Java和SDK的环境变量后，Javac不是内部命令

系统win7-64位。当时我配置好的坏境变量是这样的：JAVA_HOME      C:Program FilesJavajdk1.7.0_17

                                                                    CLASSPATH        .;%JAVA_HOME%libdt.jar;%JAVA_HOME%lib ools.jar;

                                                                   PATH                  %JAVA_HOME%in;C:WINDOWSsystem32;C:WINDOWS;C:WINDOWSsystem32Wbem;C;Tclin;%JAVA_HOME%in; %JAVA_HOME%jrein;C:Program Files (x86)Androidandroid-sdk ools;%JAVA_HOME%in;

后来PATH改成这样就好了：%JAVA_HOME%in;C:WINDOWSsystem32;C:WINDOWS;C:WINDOWSsystem32Wbem;C;Tclin;%JAVA_HOME%in; %JAVA_HOME%jrein;C:Program Files (x86)Androidandroid-sdk ools;C:Program FilesJavajdk1.7.0_17in;