How is the constructor method of Java Map used?

2 years ago
Benjamin Taylor
1 minute

In Java, the Map interface cannot be instantiated directly, but you can create Map objects using its implementation classes like HashMap, TreeMap, etc.

  1. Construct a Map object using a HashMap.
Map<String, Integer> map = new HashMap<>();
  1. Create a Map object using a TreeMap.
Map<String, Integer> map = new TreeMap<>();
  1. Construct a Map object using Hashtable (thread-safe).
Map<String, Integer> map = new Hashtable<>();
  1. Create a Map object using LinkedHashMap to maintain the order of insertion.
Map<String, Integer> map = new LinkedHashMap<>();

In the above example, String represents the type of key, and Integer represents the type of value. Choose the appropriate implementation class to construct a Map object based on your actual needs.

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