Web Reference: Feb 20, 2026 · In this tutorial, we’ll explore the concept of a shallow vs deep copy of a HashMap along with several techniques to copy a HashMap in Java. We’ll also consider some of the external libraries that can help us in specific cases. If we want to copy an object in Java, there are two possibilities that we need to consider: a shallow copy and a deep copy. The shallow copy is the approach when we only copy field values. Jul 23, 2025 · It is one of the shortest and easiest ways to copy one HashMap to another. We can use a copy constructor to copy a map which is a special constructor for creating a new object as a copy of an existing object.
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