Web Reference: Jul 23, 2025 · That is, if you need to get the keys back in insertion order, then use LinkedHashMap. If you need to get the keys back in their true/natural order, then use TreeMap. Today, we’re looking at the difference between two commonly used classes in Java — HashMap and LinkedHashMap. Both are used to store key-value pairs. Both are part of the java.util package. LinkedHashMap is very similar to HashMap, but it adds awareness to the order at which items are added (or accessed), so the iteration order is the same as insertion order (or access order, depending on construction parameters).
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