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: https://openinapp.co/udemycourse Course Description Video : https://yt.openinapp.co/dmjvd 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 asked Interview Quest...   Advance Java Interview Questions and Answers :    • Advance Java Interview Questions   Java 8 Interview Questions and Answers :    • Java 8 Interview Questions(New Features)   Hibernate Interview Questions and Answers :    • Hibernate Interview Questions Java   Spring Boot Interview Questions and Answers :    • Advance Java Interview Questions   Angular Playlist :    • Angular Course Introduction || Angular 8   SQL Playlist :    • SQL Interview Questions and Answers   GIT :    • GIT   Subscriber and Follow Code Decode Subscriber Code Decode : https://www.youtube.com/c/CodeDecode?... 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