remove duplicate code; article already moved to core-java-collections-6
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package com.baeldung.listiteration;
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import org.junit.jupiter.api.Test;
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import java.util.*;
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import java.util.stream.Collectors;
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import java.util.stream.Stream;
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import static org.junit.jupiter.api.Assertions.assertIterableEquals;
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public class ListIterationUnitTest {
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List<String> programmingLanguages = new ArrayList<>(List.of("Java", "Python", "C++"));
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List<Integer> numbers = new ArrayList<>(List.of(1, 2, 3));
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@Test
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public void givenStringList_whenAddElementWithListIterator_thenModifiedList() {
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ListIterator<String> listIterator = programmingLanguages.listIterator();
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while (listIterator.hasNext()) {
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String language = listIterator.next();
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if (language.equals("Python")) {
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listIterator.add("JavaScript");
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}
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}
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assertIterableEquals(Arrays.asList("Java", "Python", "JavaScript", "C++"), programmingLanguages);
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}
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@Test
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public void givenNumericalList_whenMultiplyElementWithListIterator_thenModifiedList() {
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ListIterator<Integer> listIterator = numbers.listIterator();
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while (listIterator.hasNext()) {
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int num = listIterator.next();
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if (num == 2) {
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listIterator.add(num * 10);
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}
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}
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assertIterableEquals(Arrays.asList(1, 2, 20, 3), numbers);
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}
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@Test
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public void givenStringList_whenAddElementWithEnhancedForLoopAndCopy_thenModifiedList() {
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List<String> copyOfWords = new ArrayList<>(programmingLanguages);
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for (String word : copyOfWords) {
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programmingLanguages.add(word.toUpperCase()); // Modified: Convert to uppercase
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}
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assertIterableEquals(Arrays.asList("Java", "Python", "C++", "JAVA", "PYTHON", "C++"), programmingLanguages);
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}
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@Test
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public void givenNumericalList_whenMultiplyElementWithEnhancedForLoopAndCopy_thenModifiedList() {
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List<Integer> copyOfNumbers = new ArrayList<>(numbers);
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for (int num : copyOfNumbers) {
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numbers.add(num * 2);
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}
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assertIterableEquals(Arrays.asList(1, 2, 3, 2, 4, 6), numbers);
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}
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@Test
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public void givenStringList_whenConvertToUpperCaseWithJava8Stream_thenModifiedList() {
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programmingLanguages = programmingLanguages.stream().map(String::toUpperCase).collect(Collectors.toList());
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assertIterableEquals(Arrays.asList("JAVA", "PYTHON", "C++"), programmingLanguages);
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}
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@Test
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public void givenNumericalList_whenMultiplyByThreeWithJava8Stream_thenModifiedList() {
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numbers = numbers.stream().map(num -> num * 3).collect(Collectors.toList());
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assertIterableEquals(Arrays.asList(3, 6, 9), numbers);
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}
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}
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