BAEL-6726, Merge Two Arrays and Remove Duplicates in Java
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parthiv39731
parent
c54cd04c33
commit
7b188517e3
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package com.baeldung.mergeandremoveduplicate;
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import java.util.Arrays;
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import java.util.HashSet;
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import java.util.Set;
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import java.util.stream.Stream;
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public class MergeArraysAndRemoveDuplicate {
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public static int[] removeDuplicateOnSortedArray(int[] arr) {
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// Initialize a new array to store unique elements
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int[] uniqueArray = new int[arr.length];
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uniqueArray[0] = arr[0];
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int uniqueCount = 1;
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// Iterate through the sorted array to remove duplicates
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for (int i = 1; i < arr.length; i++) {
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if (arr[i] != arr[i - 1]) {
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uniqueArray[uniqueCount] = arr[i];
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uniqueCount++;
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}
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}
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int[] truncatedArray = new int[uniqueCount];
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System.arraycopy(uniqueArray, 0, truncatedArray, 0, uniqueCount);
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return truncatedArray;
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}
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public static int[] mergeAndRemoveDuplicatesUsingStream(int[] arr1, int[] arr2) {
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Stream<Integer> s1 = Arrays.stream(arr1).boxed();
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Stream<Integer> s2 = Arrays.stream(arr2).boxed();
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return Stream.concat(s1, s2)
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.distinct()
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.mapToInt(Integer::intValue)
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.toArray();
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}
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public static int[] mergeAndRemoveDuplicatesUsingSet(int[] arr1, int[] arr2) {
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int[] mergedArr = mergeArrays(arr1, arr2);
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Set<Integer> uniqueInts = new HashSet<>();
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for (int el : mergedArr) {
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uniqueInts.add(el);
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}
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return getArrayFromSet(uniqueInts);
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}
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private static int[] getArrayFromSet(Set<Integer> set) {
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int[] mergedArrWithoutDuplicated = new int[set.size()];
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int i = 0;
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for (Integer el: set) {
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mergedArrWithoutDuplicated[i] = el;
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i++;
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}
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return mergedArrWithoutDuplicated;
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}
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public static int[] mergeAndRemoveDuplicates(int[] arr1, int[] arr2) {
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return removeDuplicate(mergeArrays(arr1, arr2));
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}
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public static int[] mergeAndRemoveDuplicatesOnSortedArray(int[] arr1, int[] arr2) {
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return removeDuplicateOnSortedArray(mergeArrays(arr1, arr2));
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}
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private static int[] mergeArrays(int[] arr1, int[] arr2) {
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int[] mergedArrays = new int[arr1.length + arr2.length];
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System.arraycopy(arr1, 0, mergedArrays, 0, arr1.length);
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System.arraycopy(arr2, 0, mergedArrays, arr1.length, arr2.length);
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return mergedArrays;
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}
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private static int[] removeDuplicate(int[] arr) {
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int[] withoutDuplicates = new int[arr.length];
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int i = 0;
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for(int element : arr) {
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if(!isElementPresent(withoutDuplicates, element)) {
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withoutDuplicates[i] = element;
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i++;
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}
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}
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int[] truncatedArray = new int[i];
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System.arraycopy(withoutDuplicates, 0, truncatedArray, 0, i);
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return truncatedArray;
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}
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private static boolean isElementPresent(int[] arr, int element) {
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for(int el : arr) {
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if(el == element) {
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return true;
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}
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}
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return false;
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}
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}
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@ -0,0 +1,74 @@
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package com.baeldung.mergeandremoveduplicate;
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import org.junit.jupiter.api.Test;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.util.Arrays;
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import java.util.stream.Collectors;
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import static org.junit.jupiter.api.Assertions.assertArrayEquals;
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public class MergeArraysAndRemoveDuplicateUnitTest {
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private final Logger logger = LoggerFactory.getLogger(MergeArraysAndRemoveDuplicateUnitTest.class);
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private static String getCommaDelimited(int[] arr) {
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return Arrays.stream(arr)
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.mapToObj(Integer::toString)
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.collect(Collectors.joining(", "));
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}
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@Test
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public void givenNoLibrary_whenArr1andArr2_thenMergeAndRemoveDuplicates() {
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int[] arr1 = {3, 2, 1, 4, 5, 6, 8, 7, 9};
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int[] arr2 = {8, 9, 10, 11, 12, 13, 15, 14, 15, 14, 16, 17};
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int[] expectedArr = {3, 2, 1, 4, 5, 6, 8, 7, 9, 10, 11, 12, 13, 15, 14, 16, 17};
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int[] mergedArr = MergeArraysAndRemoveDuplicate.mergeAndRemoveDuplicates(arr1, arr2);
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//merged array maintains the order of the elements in the arrays
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assertArrayEquals(expectedArr, mergedArr);
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logger.info(getCommaDelimited(mergedArr));
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}
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@Test
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public void givenNoLibrary_whenArr1andArr2_thenMergeSortAndRemoveDuplicates() {
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int[] arr1 = {1, 2, 3, 4, 5, 5, 6, 7, 7, 8};
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int[] arr2 = {8, 9, 10, 11, 12, 13, 14, 15, 15, 16, 17};
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int[] expectedArr = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17};
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int[] mergedArr = MergeArraysAndRemoveDuplicate.mergeAndRemoveDuplicatesOnSortedArray(arr1, arr2);
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assertArrayEquals(expectedArr, mergedArr);
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logger.info(getCommaDelimited(mergedArr));
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}
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@Test
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public void givenSet_whenArr1andArr2_thenMergeAndRemoveDuplicates() {
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int[] arr1 = {3, 2, 1, 4, 5, 6, 8, 7, 9};
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int[] arr2 = {8, 9, 10, 11, 12, 13, 15, 14, 15, 14, 16, 17};
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int[] expectedArr = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17};
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int[] mergedArr = MergeArraysAndRemoveDuplicate.mergeAndRemoveDuplicatesUsingSet(arr1, arr2);
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assertArrayEquals(expectedArr, mergedArr);
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logger.info(getCommaDelimited(mergedArr));
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}
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@Test
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public void givenStream_whenArr1andArr2_thenMergeAndRemoveDuplicates() {
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int[] arr1 = {3, 2, 1, 4, 5, 6, 8, 7, 9};
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int[] arr2 = {8, 9, 10, 11, 12, 13, 15, 14, 15, 14, 16, 17};
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int[] expectedArr = {3, 2, 1, 4, 5, 6, 8, 7, 9, 10, 11, 12, 13, 15, 14, 16, 17};
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int[] mergedArr = MergeArraysAndRemoveDuplicate.mergeAndRemoveDuplicatesUsingStream(arr1, arr2);
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assertArrayEquals(expectedArr, mergedArr);
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logger.info(getCommaDelimited(mergedArr));
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}
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}
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