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. A notable difference between Hashtable and HashMap is that in a Hashtable, "neither the key nor the value can be null". This constraint does not exist on the latter. In this Collection framework tutorial we will learn what are differences and similarities between java.util.HashMap, java.util.Hashtable, java.util.LinkedHashMap and java.util.TreeMap in java.
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