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Program to print the duplicate elements of an array. In this program, we need to print the duplicate elements present in the array. This can be done through two loops. The first loop will select an element and the second loop will iteration through the array by comparing the selected element with other elements.
Dec 14, 2023 · Given an array arr of N elements, the task is to find the length of the smallest subarray of the given array that contains at least one duplicate element. A subarray is formed from consecutive elements of an array.
- 12 min
Jan 21, 2019 · Learn five methods to find duplicate elements in array in java using Brute Force, Sorting, HashSet, HashMap and Java 8 Streams. Compare the time and space complexity of each method and see the code examples.
Oct 17, 2010 · int[] array = {10, 2, 2, 3, 19, 5, 6, 7, 16, 17, 18, 19}; Set<Integer> duplicates = new HashSet<>(); for (int i = 0; i < array.length - 1; i++) { for (int j = i + 1; j < array.length; j++) { if (array[i] == array[j]) { duplicates.add(array[i]); } } } System.out.println(duplicates);
- Using Stream.distinct() method. Stream.distinct() method eliminates/removes duplicate from Original Arrays and store into new Arrays using toArray(String[]::new) method which results into unique elements in an Arrays.
- Using Stream.filter() and Collections.frequency() methods. Convert original Arrays into Set using collect(Collectors.toSet()) method which results into new Set with unique elements.
- Using Stream.filter() and Set.add() methods. Create HashSet object to store/add unique elements. For finding duplicates, use Stream.filter() method by adding elements into newly created HashSet object using add() method.
- Using Collectors.toMap() and Math::addExact for counting duplicates. Collectors.toMap() method can be used to convert Stream/List or Arrays of Stream into Map with actual Stream/List/Arrays elements being Key and their duplicate count as Value.
Nov 9, 2022 · Learn to find, count and remove duplicate elements from an array in Java using Streams, Map and Set from the Collections framework.
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How to count and remove duplicate elements from an array in Java?
May 4, 2023 · Learn different methods to find duplicate elements in a Java array, such as nested loops, sets, streams, and hash tables. Compare the time and space complexity of each method and choose the most efficient one for your use case.
