question: public static @ CheckForNull ClassDescriptor createClassDescriptorFromFieldSignature ( String signature ) { int start = signature . indexOf ( 'L' ) ; if ( start < 0 ) { return null ; } int end = signature . indexOf ( ';' , start ) ; if ( end < 0 ) { return null ; } return createClassDescriptor ( signature . substring ( start + 1 , end ) ) ; }
target:  Create a class descriptor from a field signature