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Neetika23Neetika Khandelwal
Neetika23
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Neetika Khandelwal
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Bael 8760 (#18642)
* BAEL-8760 * BAEL-8760 * BAEL-8760 * BAEL-8760 * BAEL-8760 --------- Co-authored-by: Neetika Khandelwal <[email protected]>
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‎core-java-modules/core-java-collections-list-8/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>core-java-collections-list-8</artifactId>
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<packaging>jar</packaging>
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<name>core-java-collections-list-8</name>
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<parent>
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<groupId>com.baeldung.core-java-modules</groupId>
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<artifactId>core-java-modules</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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</parent>
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<dependencies>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-lang3</artifactId>
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<version>${commons-lang3.version}</version>
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</dependency>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-collections4</artifactId>
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<version>${commons-collections4.version}</version>
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</dependency>
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</dependencies>
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<properties>
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<commons-lang3.version>3.17.0</commons-lang3.version>
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</properties>
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</project>

‎core-java-modules/core-java-collections-list-8/src/main/java/com/baeldung/linkedlistarray/LinkedListArray.java

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package com.baeldung.linkedlistarray;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.LinkedList;
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import java.util.stream.IntStream;
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public class LinkedListArray {
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public static void allocateNumbers(int[] numbers, ArrayList<LinkedList<Integer>> groups) {
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for (int num : numbers) {
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int index = (num < 10) ? 0 : (num < 20 ? 1 : 2);
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groups.get(index)
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.add(num);
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}
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}
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public static void allocateNumbers(int[] numbers, LinkedList<Integer>[] groups) {
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for (int num : numbers) {
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int index = (num < 10) ? 0 : (num < 20 ? 1 : 2);
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groups[index].add(num);
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}
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}
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public static LinkedList<Integer>[] createUsingRawArray() {
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@SuppressWarnings("unchecked") LinkedList<Integer>[] groups = new LinkedList[3];
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for (int i = 0; i < groups.length; i++) {
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groups[i] = new LinkedList<>();
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}
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return groups;
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}
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public static ArrayList<LinkedList<Integer>> createUsingArrayList() {
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ArrayList<LinkedList<Integer>> groups = new ArrayList<>();
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for (int i = 0; i < 3; i++) {
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groups.add(new LinkedList<>());
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}
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return groups;
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}
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public static ArrayList<LinkedList<Integer>> createUsingStreams() {
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ArrayList<LinkedList<Integer>> groups = new ArrayList<>();
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IntStream.range(0, 3)
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.forEach(i -> groups.add(new LinkedList<>()));
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return groups;
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}
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public static LinkedList<Integer>[] createUsingSetAll() {
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@SuppressWarnings("unchecked") LinkedList<Integer>[] groups = new LinkedList[3];
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Arrays.setAll(groups, i -> new LinkedList<>());
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return groups;
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}
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}
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‎core-java-modules/core-java-collections-list-8/src/test/java/baeldung/linkedlistarray/LinkedListArrayUnitTest.java

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package baeldung.linkedlistarray;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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import java.util.ArrayList;
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import java.util.LinkedList;
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import java.util.List;
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import org.junit.jupiter.api.Test;
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import com.baeldung.linkedlistarray.LinkedListArray;
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public class LinkedListArrayUnitTest {
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int[] input = { 3, 7, 12, 15, 20, 25 };
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@Test
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void givenNumbers_whenGroupedUsingRawArray_thenGroupsAreCorrect() {
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LinkedList<Integer>[] arrayOfLists = LinkedListArray.createUsingRawArray();
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LinkedListArray.allocateNumbers(input, arrayOfLists);
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assertEquals(2, arrayOfLists[0].size());
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assertTrue(arrayOfLists[0].contains(3));
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assertTrue(arrayOfLists[0].contains(7));
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}
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@Test
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void givenNumbers_whenGroupedUsingLinkedList_thenGroupsAreCorrect() {
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ArrayList<LinkedList<Integer>> arrayOfLists = LinkedListArray.createUsingArrayList();
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LinkedListArray.allocateNumbers(input, arrayOfLists);
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assertEquals(2, arrayOfLists.get(1)
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.size());
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assertTrue(arrayOfLists.get(1)
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.contains(12));
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assertTrue(arrayOfLists.get(1)
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.contains(15));
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}
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@Test
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void givenNumbers_whenGroupedUsingStreams_thenGroupsAreCorrect() {
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ArrayList<LinkedList<Integer>> arrayOfLists = LinkedListArray.createUsingStreams();
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LinkedListArray.allocateNumbers(input, arrayOfLists);
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assertEquals(2, arrayOfLists.get(0)
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.size());
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assertTrue(arrayOfLists.get(0)
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.contains(3));
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assertTrue(arrayOfLists.get(0)
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.contains(7));
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}
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@Test
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void givenNumbers_whenGroupedUsingSetAll_thenGroupsAreCorrect() {
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LinkedList<Integer>[] arrayOfLists = LinkedListArray.createUsingSetAll();
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LinkedListArray.allocateNumbers(input, arrayOfLists);
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assertEquals(2, arrayOfLists[2].size());
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assertTrue(arrayOfLists[2].contains(20));
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assertTrue(arrayOfLists[2].contains(25));
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}
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}

‎core-java-modules/pom.xml

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<module>java-websocket</module>
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<module>core-java-8-datetime-3</module>
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<module>core-java-8-datetime-4</module>
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<module>core-java-collections-list-8</module>
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<!--<module>core-java-22</module>--> <!-- Migrated to default-jdk22 profile -->
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<!--<module>core-java-23</module>--> <!-- Migrated to default-jdk23 profile -->
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<!--<module>core-java-24</module>--> <!-- Migrated to default-jdk24 profile -->

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