Java: Map Interface and HashMap Question How do you add an element to a HashMap? (Click to reveal answer) Answer Use the put() method to add a key-value pair. The put() method is used to insert key-value pairs into a HashMap. If the key already exists, the old value is replaced with the new value. For example, adding a new product to a catalog or updating its details. Additional NotesHow do you add an element to a HashMap? Track: Java Topic: Collections Focus: Map Interface and HashMap Topics: Collections Java Map Interface and HashMap