Lecture 13
2
Maps
•arrays and ArrayLists locate entries by index
–index is an integer position, starting at 0
•A Map locates entries by key      
–key is often a String (think dictionary, phone book)
•A map stores key-value pairs
–key: “Java”     value:            “a modern OO language”
–
–
–key: “UMass”  value:
 
areaCode:    617
exchange:   287
PhoneNumber
number:     5000