Difference Between putIfAbsent() and computeIfAbsent() in Java’s Map

Date: 2024-03-13

Java's Map interface offers putIfAbsent() and computeIfAbsent() methods for adding key-value pairs. putIfAbsent() adds a key-value pair only if the key doesn't exist (or has a null value), employing eager evaluation. computeIfAbsent(), using lazy evaluation, computes the value only when the key is accessed and is not already associated with a non-null value. Choosing between them depends on whether immediate value availability or deferred computation is prioritized, impacting efficiency and resource usage. Understanding these differences is crucial for writing optimized Java code.

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