byte_coder28 · 09.05.2026

How to update value by key in HashMap? Detailed guide

Hello everyone! I'm new to Java and can't figure out HashMap. I have a simple task: I store user data in a HashMap where the key is the user ID (Integer) and the value is their name (String). I need to replace the user's name if it already exists, or add a new entry if there is no such ID. Here is my code: ```java HashMap users = new HashMap<>(); users.put(1, "Anna"); users.put(2, "Boris"); users.put(3, "Victor"); // Trying to update user with ID = 2 users.put(2, "Boris Updated"); ``` I noticed that `put()` does replace the value if the key already exists. But I'm not sure if this is the correct approach. It seems to me that there should be a special method for updating, not the same `put()`. Also I heard about the `repl

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