[str-all-upper] Check if a String is All Uppercase or Lowercase in Java (#14227)
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>core-java-string-operations-6</artifactId>
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<name>core-java-string-operations-6</name>
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<artifactId>core-java-modules</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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</parent>
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<dependencies>
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-lang3</artifactId>
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<version>${apache.commons-lang.version}</version>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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@ -29,6 +37,7 @@
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<properties>
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<maven.compiler.source>11</maven.compiler.source>
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<maven.compiler.target>11</maven.compiler.target>
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<apache.commons-lang.version>3.12.0</apache.commons-lang.version>
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</properties>
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</project>
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@ -0,0 +1,104 @@
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package com.baeldung.checkcase;
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import static org.junit.jupiter.api.Assertions.assertFalse;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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import org.apache.commons.lang3.StringUtils;
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import org.junit.jupiter.api.Test;
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class CaseChecker {
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static boolean allUpper1(String input) {
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return input.equals(input.toUpperCase());
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}
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static boolean allLower1(String input) {
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return input.equals(input.toLowerCase());
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}
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static boolean allUpper2(String input) {
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for (char c : input.toCharArray()) {
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// don't write in this way: if (!Character.isUpperCase(c))
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if (Character.isLowerCase(c)) {
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return false;
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}
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}
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return true;
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}
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static boolean allLower2(String input) {
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for (char c : input.toCharArray()) {
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// don't write in this way: if (!Character.isLowerCase(c))
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if (Character.isUpperCase(c)) {
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return false;
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}
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}
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return true;
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}
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static boolean allUpper3(String input) {
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return input.chars()
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.noneMatch(Character::isLowerCase);
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}
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static boolean allLower3(String input) {
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return input.chars()
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.noneMatch(Character::isUpperCase);
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}
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}
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public class StringAllUpperOrLowercaseUnitTest {
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private static final String UPPER_INPUT = "1: COOL!";
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private static final String LOWER_INPUT = "2: cool!";
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private static final String MIXED_INPUT = "3: Cool!";
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@Test
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void whenComparingToConvertedString_thenGetExpectedResult() {
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assertTrue(CaseChecker.allLower1(LOWER_INPUT));
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assertFalse(CaseChecker.allLower1(UPPER_INPUT));
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assertFalse(CaseChecker.allLower1(MIXED_INPUT));
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assertFalse(CaseChecker.allUpper1(LOWER_INPUT));
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assertTrue(CaseChecker.allUpper1(UPPER_INPUT));
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assertFalse(CaseChecker.allUpper1(MIXED_INPUT));
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}
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@Test
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void whenCheckCharInArray_thenGetExpectedResult() {
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assertTrue(CaseChecker.allLower2(LOWER_INPUT));
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assertFalse(CaseChecker.allLower2(UPPER_INPUT));
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assertFalse(CaseChecker.allLower2(MIXED_INPUT));
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assertFalse(CaseChecker.allUpper2(LOWER_INPUT));
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assertTrue(CaseChecker.allUpper2(UPPER_INPUT));
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assertFalse(CaseChecker.allUpper2(MIXED_INPUT));
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}
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@Test
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void whenUsingStream_thenGetExpectedResult() {
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assertTrue(CaseChecker.allLower3(LOWER_INPUT));
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assertFalse(CaseChecker.allLower3(UPPER_INPUT));
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assertFalse(CaseChecker.allLower3(MIXED_INPUT));
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assertFalse(CaseChecker.allUpper3(LOWER_INPUT));
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assertTrue(CaseChecker.allUpper3(UPPER_INPUT));
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assertFalse(CaseChecker.allUpper3(MIXED_INPUT));
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}
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@Test
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void whenUsingApacheCommons_thenGetExpectedResult() {
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assertFalse(StringUtils.isAllLowerCase(LOWER_INPUT));
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assertFalse(StringUtils.isAllLowerCase(UPPER_INPUT));
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assertFalse(StringUtils.isAllLowerCase(MIXED_INPUT));
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assertFalse(StringUtils.isAllLowerCase("a b"));
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assertTrue(StringUtils.isAllLowerCase("ab"));
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assertFalse(StringUtils.isAllUpperCase(LOWER_INPUT));
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assertFalse(StringUtils.isAllUpperCase(UPPER_INPUT));
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assertFalse(StringUtils.isAllUpperCase(MIXED_INPUT));
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assertFalse(StringUtils.isAllUpperCase("A B"));
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assertTrue(StringUtils.isAllUpperCase("AB"));
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}
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}
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