HashSet in addition to HashMap inwards Java
HashSet vs HashMap is a classical Java Collection interview question which focuses on What are differences betwixt HashSet in addition to HashMap inwards price of features, usage, in addition to performance. If y'all are inwards Java programming fifty-fifty for a yr or so, y'all are probable to move familiar amongst What is HashSet inwards Java in addition to What is HashMap inwards Java, these 2 are almost pop collection classes. Despite existence hash based collection HashSet and HashMap are dissimilar to each other because the underlying interface is different. HashSet implements Set interface via extending AbstractSetclass in addition to HashMap implements Map interface. Before seeing differences betwixt let's come across what is common betwixt HashSet in addition to HashMap inwards Java:
1) Both HashMap and HashSet are a hash based collection inwards Java.
2) Both HashMap and HashSet are non synchronized and tin non move shared betwixt multiple threads.
3) Iterator returned yesteryear HashMap's keySet() in addition to HashSet are fail-fast in addition to they ConcurrentModificationException if they let on whatever structural alter inwards Collection.
4) Both HashMap in addition to HashSet provided constant fourth dimension performance for basic operations similar put(), get() etc.
5) Both HashSet in addition to HashMap allows null values.
After seeing similarities on HashMap and HashSet, directly let's come across some divergence betwixt them :
Further Learning
Java In-Depth: Become a Complete Java Engineer
Difference betwixt HashMap in addition to ConcurrentHashMap inwards Java
HashSet vs HashMap is a classical Java Collection interview question which focuses on What are differences betwixt HashSet in addition to HashMap inwards price of features, usage, in addition to performance. If y'all are inwards Java programming fifty-fifty for a yr or so, y'all are probable to move familiar amongst What is HashSet inwards Java in addition to What is HashMap inwards Java, these 2 are almost pop collection classes. Despite existence hash based collection HashSet and HashMap are dissimilar to each other because the underlying interface is different. HashSet implements Set interface via extending AbstractSetclass in addition to HashMap implements Map interface. Before seeing differences betwixt let's come across what is common betwixt HashSet in addition to HashMap inwards Java:
Similarities on HashMap in addition to HashSet inwards Java
Here are some of the mutual materials betwixt both of them:1) Both HashMap and HashSet are a hash based collection inwards Java.
2) Both HashMap and HashSet are non synchronized and tin non move shared betwixt multiple threads.
3) Iterator returned yesteryear HashMap's keySet() in addition to HashSet are fail-fast in addition to they ConcurrentModificationException if they let on whatever structural alter inwards Collection.
4) Both HashMap in addition to HashSet provided constant fourth dimension performance for basic operations similar put(), get() etc.
5) Both HashSet in addition to HashMap allows null values.
Differences betwixt HashSet in addition to HashMap inwards Java
After seeing similarities on HashMap and HashSet, directly let's come across some divergence betwixt them : 1) The origin in addition to almost pregnant divergence betwixt HashMap in addition to HashSet is that HashMap is an implementation of Map interface land HashSet is an implementation of Set interface, which agency HashMap is a primal value based data-structure in addition to HashSet guarantees uniqueness yesteryear non allowing duplicates.In reality, HashSet is a wrapper around HashMap inwards Java, if y'all hold back at the code of add(E e) method of HashSet.java y'all volition come across next code :
public boolean add(E e) {
render map.put(e, PRESENT)==null;
}
where it's putting Object into a map every bit primal in addition to value is a in conclusion object PRESENT which is a dummy.
2) The minute divergence betwixt HashMap and HashSet is that nosotros role add() method to seat elements into Set simply nosotros role put() method to insert primal in addition to value into HashMap inwards Java.
3) HashSet allows exclusively 1 null key, simply HashMap tin allow 1 null primal + multiple null values.
That's all on the difference betwixt HashSet in addition to HashMap inwards Java. In summary HashSet in addition to HashMap are 2 dissimilar type of Collection 1 existence Set in addition to other existence Map.
public boolean add(E e) {
render map.put(e, PRESENT)==null;
}
where it's putting Object into a map every bit primal in addition to value is a in conclusion object PRESENT which is a dummy.
2) The minute divergence betwixt HashMap and HashSet is that nosotros role add() method to seat elements into Set simply nosotros role put() method to insert primal in addition to value into HashMap inwards Java.
3) HashSet allows exclusively 1 null key, simply HashMap tin allow 1 null primal + multiple null values.
That's all on the difference betwixt HashSet in addition to HashMap inwards Java. In summary HashSet in addition to HashMap are 2 dissimilar type of Collection 1 existence Set in addition to other existence Map.
Further Learning
Java In-Depth: Become a Complete Java Engineer
Difference betwixt HashMap in addition to ConcurrentHashMap inwards Java
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