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تفاوت Map و HashMap ؟
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How Map Is Different From HashMap?
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HashMap does not maintain any insertion order of its elements hence it is quicker than Map.
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In contrast to Map, HashMap can hold duplicate values.
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It’s possible to implement the Map interface by utilizing its implementing classes. Contrariwise implementing the Map interface is what HashMap is all about.
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The map does not allow storage of a single null key whereas HashMap can store multiple null values along with a single null key.
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Unlike Map which is an interface, HashMap is a non-synchronized class of the Java Collections framework.
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HashMap and TreeMap are two implementations of Map whereas the HashMap class uses Map interface.
لینک مرجع: https://www.ksolves.com/blog/java/difference-between-map-and-hashmap-in-java#:~:text=HashMap%20is%20a%20non%2Dsynchronized,to%20map%20key%2Dpair%20values.
