// someexamples of 1.5 extensions package com.puppycrawl.tools.checkstyle.main; @interface MyAnnotation1 { String name(); int version(); } @MyAnnotation1(name = "ABC", version = 1) public class Input15Extensions { } enum Enum1 { A, B, C; Enum1() {} public String toString() { return ""; //some custom implementation } } interface TestRequireThisEnum { enum DAY_OF_WEEK { SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY } }