Additional Notes
Checking for Key Existence in a HashMap?
Track: Java
Topic: Collections
Focus: Map Interface and HashMap
Java: Map Interface and HashMap
Answer
Use containsKey() to check for a specific key.
The containsKey() method returns true if the map contains a mapping for the specified key. This is useful when you want to verify whether a specific product ID, for example, is present in your catalog before performing an operation.
The containsKey() method returns true if the map contains a mapping for the specified key. This is useful when you want to verify whether a specific product ID, for example, is present in your catalog before performing an operation.
Topics: Collections Java Map Interface and HashMap