question: private static String descriptorToInternalName ( String descriptor ) { switch ( descriptor . charAt ( 0 ) ) { case 'B' : case 'C' : case 'D' : case 'F' : case 'I' : case 'J' : case 'S' : case 'Z' : case 'V' : case '[' : return descriptor ; case 'L' : return classDescriptorToInternalName ( descriptor ) ; default : throw new IllegalArgumentException ( "bad descriptor:" + descriptor ) ; } }
target:  Convert a non-method type descriptor into an internal type.