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Commit ef681e8

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DEV: Implementing Alternative String Arrange (#6551)
1 parent fb12971 commit ef681e8

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package com.thealgorithms.strings;
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/**
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* This class provides a method to arrange two strings by alternating their characters.
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* If one string is longer, the remaining characters of the longer string are appended at the end.
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* <p>
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* Example:
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* Input: "abc", "12345"
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* Output: "a1b2c345"
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* <p>
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* Input: "abcd", "12"
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* Output: "a1b2cd"
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*
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* @author Milad Sadeghi
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*/
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public final class AlternativeStringArrange {
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// Private constructor to prevent instantiation
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private AlternativeStringArrange() {
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}
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/**
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* Arranges two strings by alternating their characters.
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*
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* @param firstString the first input string
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* @param secondString the second input string
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* @return a new string with characters from both strings arranged alternately
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*/
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public static String arrange(String firstString, String secondString) {
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StringBuilder result = new StringBuilder();
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int length1 = firstString.length();
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int length2 = secondString.length();
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int minLength = Math.min(length1, length2);
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for (int i = 0; i < minLength; i++) {
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result.append(firstString.charAt(i));
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result.append(secondString.charAt(i));
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}
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if (length1 > length2) {
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result.append(firstString.substring(minLength));
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} else if (length2 > length1) {
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result.append(secondString.substring(minLength));
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}
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return result.toString();
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}
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}
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package com.thealgorithms.strings;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import java.util.stream.Stream;
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import org.junit.jupiter.params.ParameterizedTest;
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import org.junit.jupiter.params.provider.MethodSource;
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class AlternativeStringArrangeTest {
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// Method to provide test data
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private static Stream<Object[]> provideTestData() {
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return Stream.of(new Object[] {"abc", "12345", "a1b2c345"}, new Object[] {"abcd", "12", "a1b2cd"}, new Object[] {"", "123", "123"}, new Object[] {"abc", "", "abc"}, new Object[] {"a", "1", "a1"}, new Object[] {"ab", "12", "a1b2"}, new Object[] {"abcdef", "123", "a1b2c3def"},
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new Object[] {"ab", "123456", "a1b23456"});
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}
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// Parameterized test using the provided test data
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@ParameterizedTest(name = "{0} and {1} should return {2}")
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@MethodSource("provideTestData")
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void arrangeTest(String input1, String input2, String expected) {
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assertEquals(expected, AlternativeStringArrange.arrange(input1, input2));
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}
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}

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