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Merge pull request #15785 from sk1418/count-upper-lower

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[count-upper-lower] count upper/lowercase letters
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Liam Williams 2024-02-14 21:20:10 +00:00 committed by GitHub
commit c8ac9ca720
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3 changed files with 125 additions and 74 deletions
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1
core-java-modules/core-java-string-operations-8/README.md
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@ -1,2 +1 @@
### Relevant Articles:

38
core-java-modules/core-java-string-operations-8/pom.xml
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<version>0.0.1-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>${apache.commons.lang3.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-text</artifactId>
<version>${commons-text.version}</version>
</dependency>
<dependency>
<groupId>org.liquibase</groupId>
<artifactId>liquibase-core</artifactId>
<version>4.9.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter</artifactId>
<version>5.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.liquibase</groupId>
<artifactId>liquibase-core</artifactId>
<version>4.9.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.2</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
@ -65,8 +29,6 @@
<properties>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
<apache.commons.lang3.version>3.13.0</apache.commons.lang3.version>
<commons-text.version>1.10.0</commons-text.version>
</properties>
</project>

90
core-java-modules/core-java-string-operations-8/src/test/java/com/baeldung/countupperandlowercasechars/CountUpperAndLowercaseCharsUnitTest.java Normal file
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package com.baeldung.countupperandlowercasechars;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertTrue;
public class CountUpperAndLowercaseCharsUnitTest {
private static final String MY_STRING = "Hi, Welcome to Baeldung! Let's count letters!";
@Test
void whenUsingCountByCharacterRange_thenGetExpectedResult() {
LetterCount result = LetterCount.countByCharacterRange(MY_STRING);
assertEquals(4, result.getUppercaseCount());
assertEquals(31, result.getLowercaseCount());
}
@Test
void whenUsingCountByCharacterIsLowerOrUpperCase_thenGetExpectedResult() {
LetterCount result = LetterCount.countByCharacterIsUpperLower(MY_STRING);
assertEquals(4, result.getUppercaseCount());
assertEquals(31, result.getLowercaseCount());
}
@Test
void whenUsingCountByStreamApi_thenGetExpectedResult() {
LetterCount result = LetterCount.countByStreamAPI(MY_STRING);
assertEquals(4, result.getUppercaseCount());
assertEquals(31, result.getLowercaseCount());
}
@Test
void whenUsingIsUpperCaseAndIsLowerCase_thenUnicodeCharactersCanBeChecked() {
assertTrue(Character.isLowerCase('ä'));
assertTrue(Character.isUpperCase('Ä'));
}
}
class LetterCount {
private int uppercaseCount;
private int lowercaseCount;
private LetterCount(int uppercaseCount, int lowercaseCount) {
this.uppercaseCount = uppercaseCount;
this.lowercaseCount = lowercaseCount;
}
public static LetterCount countByCharacterRange(String input) {
int upperCount = 0;
int lowerCount = 0;
for (char c : input.toCharArray()) {
if (c >= 'A' && c <= 'Z') {
upperCount++;
}
if (c >= 'a' && c <= 'z') {
lowerCount++;
}
}
return new LetterCount(upperCount, lowerCount);
}
public static LetterCount countByCharacterIsUpperLower(String input) {
int upperCount = 0;
int lowerCount = 0;
for (char c : input.toCharArray()) {
if (Character.isUpperCase(c)) {
upperCount++;
}
if (Character.isLowerCase(c)) {
lowerCount++;
}
}
return new LetterCount(upperCount, lowerCount);
}
public static LetterCount countByStreamAPI(String input) {
return new LetterCount(
(int) input.chars().filter(Character::isUpperCase).count(),
(int) input.chars().filter(Character::isLowerCase).count()
);
}
public int getUppercaseCount() {
return uppercaseCount;
}
public int getLowercaseCount() {
return lowercaseCount;
}
}