Web Reference: As you can see, HashMap.forEach and HashMap.entrySet().forEach() perform best for large maps and are joined by the for loop on the entrySet() for best performance on small maps. Jul 27, 2023 · This Java tutorial discusses the different ways to iterate over a HashMap and compare the performance of each technique so we can make an informed decision. It is recommended to learn how HashMap works internally to know how the data is stored in a HashMap. Jul 23, 2025 · Method 3: Using an iterator to iterate through a HashMap. In this method, iterator is being used to iterate each mapped pair in HashMap as shown in below java program.
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