Find Duplicate Elements from list using Java 8 | Java 8 coding Interview Questions | Code Decode

In this video of code decode we have covered Java 8 coding Interview Questions and Answers where we have covered Find duplicates from a list using java 8
Udemy Course of Code Decode on Microservice k8s AWS CICD link:
openinapp.co/u...
Course Description Video :
yt.openinapp.c...
How to find duplicate elements in a Stream in Java 8
Using Set.add() method:
If the element is present in the Set already, then this Set.add() returns false. we can collect them.
Set.add() returns false if the element was already present in the set. filter such element and Collect duplicate elements in the set
How to find duplicate elements in a Stream in Java
Using Collectors.groupingBy():
The groupingBy() method of Collectors class in Java groups the objects by some property. So we will pass the property of redundancy and collect the result in a Set.
For each element in the stream, group them along with their frequency in a map, using Collectors.groupingBy() method.Then for each element in the collected map, if the frequency of any element is more than one, then this element is a duplicate element.
stream() .collect(Collectors.groupingBy( Function.identity(), Collectors.counting()))
// Convert this map into a stream
.entrySet().stream()
// Check if frequency 1// for duplicate elements // Find such elements
.filter(m - m.getValue() 1).map(Map.Entry::getKey)
// And Collect them in a Set
.collect(Collectors.toSet());
How to find duplicate elements in a Stream in Java
Collections.frequency(list, i)
count the frequency of each element, using Collections.frequency() method. Then for each element in the collection list, if the frequency of any element is more than one, then this element is a duplicate element.
stream().filter(i - Collections.frequency(list, i) 1)
.collect(Collectors.toSet());
Most Asked Core Java Interview Questions and Answers : • Core Java frequently a...
Advance Java Interview Questions and Answers : • Advance Java Interview...
Java 8 Interview Questions and Answers : • Java 8 Interview Quest...
Hibernate Interview Questions and Answers : • Hibernate Interview Qu...
Spring Boot Interview Questions and Answers : • Advance Java Interview...
Angular Playlist : • Angular Course Introdu...
SQL Playlist : • SQL Interview Question...
GIT : • GIT
Subscriber and Follow Code Decode
Subscriber Code Decode : www.youtube.co...
Linkedin : / codedecodeyoutube
Instagram : / codedecode25
#codedecode #java8optional #javainterviewquestionsandanswers
java 8 coding interview questions,java 8 interview questions code decode,java 8 interview questions and answers,java 8 code decode,java 8 interview questions for experienced,java 8 interview questions,code decode,codedecode,code decode java 8,java 8 interview questions and answers for experienced,java 8 interview questions for freshers,streams in java 8 code decode,java 8 coding interview questions and answers for experienced,code decode java 8 interview questions