Java does not allow the name of enum to start with number like 100A, 25K. In that case, we can append the code with _ (underscore) or any allowed pattern and make check of it.
Section 38.1: Enum with name at beginning
| public enum BookCode { _10A(“Simon Haykin”, “Communication System”), _42B(“Stefan Hakins”, “A Brief History of Time”), E1(“Sedra Smith”, “Electronics Circuits”); private String author; private String title; BookCode(String author, String title) { this.author = author; this.title = title; } public String getName() { String name = name(); if (name.charAt(0) == ‘_’) { name = name.substring(1, name.length()); } return name; } public static BookCode of(String code) { if (Character.isDigit(code.charAt(0))) { code = “_” + code; } return BookCode.valueOf(code); } } |
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