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refactor: CharactersSame (#5396)

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Alex Klymenko 2024-08-26 08:55:50 +02:00 committed by GitHub
parent be6b0d835b
commit 5f6510f0fa
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2 changed files with 17 additions and 36 deletions
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24
src/main/java/com/thealgorithms/strings/CharactersSame.java
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@ -5,25 +5,19 @@ public final class CharactersSame {
}
/**
* Driver Code
*/
public static void main(String[] args) {
assert isAllCharactersSame("");
assert !isAllCharactersSame("aab");
assert isAllCharactersSame("aaa");
assert isAllCharactersSame("11111");
}
/**
* check if all the characters of a string are same
* Checks if all characters in the string are the same.
*
* @param s the string to check
* @return {@code true} if all characters of a string are same, otherwise
* {@code false}
* @return {@code true} if all characters in the string are the same or if the string is empty, otherwise {@code false}
*/
public static boolean isAllCharactersSame(String s) {
for (int i = 1, length = s.length(); i < length; ++i) {
if (s.charAt(i) != s.charAt(0)) {
if (s.isEmpty()) {
return true; // Empty strings can be considered as having "all the same characters"
}
char firstChar = s.charAt(0);
for (int i = 1; i < s.length(); i++) {
if (s.charAt(i) != firstChar) {
return false;
}
}

29
src/test/java/com/thealgorithms/strings/CharacterSameTest.java
View File

@ -1,28 +1,15 @@
package com.thealgorithms.strings;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.junit.jupiter.api.Assertions.assertEquals;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.CsvSource;
public class CharacterSameTest {
class CharactersSameTest {
@Test
public void isAllCharactersSame() {
String input1 = "aaa";
String input2 = "abc";
String input3 = "1 1 1 1";
String input4 = "111";
String input5 = "";
String input6 = " ";
String input7 = ". ";
assertTrue(CharactersSame.isAllCharactersSame(input1));
assertFalse(CharactersSame.isAllCharactersSame(input2));
assertFalse(CharactersSame.isAllCharactersSame(input3));
assertTrue(CharactersSame.isAllCharactersSame(input4));
assertTrue(CharactersSame.isAllCharactersSame(input5));
assertTrue(CharactersSame.isAllCharactersSame(input6));
assertFalse(CharactersSame.isAllCharactersSame(input7));
@ParameterizedTest
@CsvSource({"aaa, true", "abc, false", "'1 1 1 1', false", "111, true", "'', true", "' ', true", "'. ', false", "'a', true", "' ', true", "'ab', false", "'11111', true", "'ababab', false", "' ', true", "'+++', true"})
void testIsAllCharactersSame(String input, boolean expected) {
assertEquals(CharactersSame.isAllCharactersSame(input), expected);
}
}