There are several Object of Person in a list.Sort by name,age and ID,including ascending and descending.(Use Strategy mode)

Exercise2\Client.java
.........\Environment.java
.........\Person.java
.........\SortByAgeDown.java
.........\SortByAgeUp.java
.........\SortByIdDown.java
.........\SortByIdUp.java
.........\SortByNameDown.java
.........\SortByNameUp.java
.........\Strategy.java
Exercise2

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