In this chapter you will learn
- What is
Map Interface
in Java? - Programming Example
What is Map Interface
in Java?
Map Interface
provides way to store value mapped by unique key. Later this key is used for retrieving data from collection. A map cannot contain duplicate value and each key map at most one value.
Programming Example
import java.util.*; class Map_Interface { public static void main(String[] args) { Map<String,String> mp=new HashMap<String,String>(); mp.put("Java" , "1"); mp.put("C#" , "2"); mp.put("SQL" , "3"); System.out.println(mp); } }
Explanation
In this programming Example we created a HashMap object
and declare it with string type. We added values along with key pair in HashMap object and printed the table.
Summary
In this chapter you learned Map Interface
in Java. In the next chapter you will learn about HashTable class in Java.