Java (4) enumeration class

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1、 Introduction to enumeration class

2、 Custom enumeration class

1. Method 1: jdk5 Custom enumeration class before 0

2. Mode 2: jdk5 0, define enumeration class with enum keyword

3、 Main methods of enum class

1、toString()

2、values()

3、valueOf(String str)

4、 The enum class defined by enum keyword is used to implement the interface

1. Situation 1

2. Case 2: