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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
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3 changed files with 125 additions and 74 deletions
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3
core-java-modules/core-java-string-operations-8/README.md
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### Relevant Articles:
### Relevant Articles:

106
core-java-modules/core-java-string-operations-8/pom.xml
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<?xml version="1.0" encoding="UTF-8"?> <?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" <project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion> <modelVersion>4.0.0</modelVersion>
<artifactId>core-java-string-operations-8</artifactId> <artifactId>core-java-string-operations-8</artifactId>
<name>core-java-string-operations-8</name> <name>core-java-string-operations-8</name>
<packaging>jar</packaging> <packaging>jar</packaging>
<parent> <parent>
<groupId>com.baeldung.core-java-modules</groupId> <groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId> <artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version> <version>0.0.1-SNAPSHOT</version>
</parent> </parent>
<dependencies> <build>
<dependency> <plugins>
<groupId>org.apache.commons</groupId> <plugin>
<artifactId>commons-lang3</artifactId> <groupId>org.apache.maven.plugins</groupId>
<version>${apache.commons.lang3.version}</version> <artifactId>maven-compiler-plugin</artifactId>
</dependency> <configuration>
<dependency> <source>${maven.compiler.source}</source>
<groupId>org.apache.commons</groupId> <target>${maven.compiler.target}</target>
<artifactId>commons-text</artifactId> </configuration>
<version>${commons-text.version}</version> </plugin>
</dependency> </plugins>
<dependency> </build>
<groupId>org.liquibase</groupId>
<artifactId>liquibase-core</artifactId> <properties>
<version>4.9.1</version> <maven.compiler.source>11</maven.compiler.source>
<scope>test</scope> <maven.compiler.target>11</maven.compiler.target>
</dependency> </properties>
<dependency>
<groupId>org.junit.jupiter</groupId> </project>
<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>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>${maven.compiler.source}</source>
<target>${maven.compiler.target}</target>
</configuration>
</plugin>
</plugins>
</build>
<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;
}
}