gets the method 's return type . examples : `` ljava/lang/string ; '' , '' i '' . concode_field_sep String mDeclClass concode_elem_sep String mReturnType concode_elem_sep String[] mArgTypes concode_elem_sep String mMethodName concode_field_sep String getDescriptor concode_elem_sep String getName concode_elem_sep String[] getArgumentTypeNames concode_elem_sep String getDeclClassName concode_elem_sep String descriptorFromProtoArray
String function ( ) { return mReturnType ; }