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What happens when duplicate key is added to HashMap?


  1. What happens when duplicate key is added to HashMap?
  2. How do you duplicate a map key?
  3. What will happen if we add duplicate in set?
  4. Can a HashMap have multiple values for same key?
  5. Can HashMap contain duplicate values?
  6. Does set accept duplicate values?
  7. Can a Key have multiple values?
  8. What happens if you add duplicate to set?
  9. Is HashMap key unique?
  10. Can HashMap have multiple values?

What happens when duplicate key is added to HashMap?

If you try to insert the duplicate key, it will replace the element of the corresponding key. HashMap is similar to HashTable, but it is unsynchronized. It allows to store the null keys as well, but there should be only one null key object and there can be any number of null values.

How do you duplicate a map key?

4 Answers. You can't have duplicate keys in a Map . You can rather create a Map> , or if you can, use Guava's Multimap . And then you can get the java.

What will happen if we add duplicate in set?

If we insert duplicate values to the Set, we don't get any compile time or run time errors. It doesn't add duplicate values in the set. Below is the add() method of the set interface in java collection that returns Boolean value either TRUE or FALSE when the object is already present in the set.

Can a HashMap have multiple values for same key?

HashMap doesn't allow duplicate keys but allows duplicate values. That means A single key can't contain more than 1 value but more than 1 key can contain a single value. HashMap allows null key also but only once and multiple null values.

Can HashMap contain duplicate values?

HashMap does not allow duplicate keys however it allows to have duplicate values. HashSet permits to have a single null value.

Does set accept duplicate values?

A Set is a Collection that cannot contain duplicate elements. It models the mathematical set abstraction. The Set interface contains only methods inherited from Collection and adds the restriction that duplicate elements are prohibited. Two Set instances are equal if they contain the same elements.

Can a Key have multiple values?

In python, if we want a dictionary in which one key has multiple values, then we need to associate an object with each key as value. This value object should be capable of having various values inside it. We can either use a tuple or a list as a value in the dictionary to associate multiple values with a key.

What happens if you add duplicate to set?

If we insert duplicate values to the Set, we don't get any compile time or run time errors. It doesn't add duplicate values in the set. Below is the add() method of the set interface in java collection that returns Boolean value either TRUE or FALSE when the object is already present in the set.

Is HashMap key unique?

HashMap is a collection to store (key,value) pairs and According to the documentation of HashMap the keys are always unique. If you add a key which already exists(collision) in the hashmap, the old value will be replaced.

Can HashMap have multiple values?

HashMap can be used to store key-value pairs. But sometimes you may want to store multiple values for the same key. For example: For Key A, you want to store - Apple, Aeroplane.



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