How to use ordinal in java

1. Concept

By calling ordinal() of the enumeration type, you can obtain the index position of the member in the enumeration.

2. Example

The following example creates an enumeration type Signal including 3 members, and calls the ordinal() method to output the members and corresponding index positions.

public enum Signal { //定义一个枚举类型 GREEN,YELLOW,RED; public static void main(String[] args) { Signal green = Signal.valueOf("GREEN"); System.out.println(green); } }

What collection classes are there in Java?

Collections in Java are mainly divided into four categories:

1. List: ordered, repeatable;

2. Queue: ordered and repeatable;

3. Set: non-repeatable;

4. Map: unordered, with unique keys and non-unique values.

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