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lor6lor6
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Merge pull request eugenp#4517 from asturcon/tutorials/titleCase
BAEL-1928 - Convert a string to title case
2 parents 36dd488 + dfbd91a commit 07f3ab6

3 files changed

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‎core-java/pom.xml‎

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<artifactId>mail</artifactId>
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<version>1.5.0-b01</version>
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</dependency>
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<dependency>
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<groupId>com.ibm.icu</groupId>
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<artifactId>icu4j</artifactId>
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<version>${icu4j.version}</version>
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</dependency>
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</dependencies>
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<build>
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<maven-javadoc-plugin.version>3.0.0-M1</maven-javadoc-plugin.version>
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<exec-maven-plugin.version>1.6.0</exec-maven-plugin.version>
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<javax.mail.version>1.5.0-b01</javax.mail.version>
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<icu4j.version>61.1</icu4j.version>
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</properties>
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</project>

‎core-java/src/main/java/com/baeldung/string/TitleCaseConverter.java‎

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package com.baeldung.string;
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import com.ibm.icu.lang.UCharacter;
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import com.ibm.icu.text.BreakIterator;
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import org.apache.commons.lang.WordUtils;
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import java.util.Arrays;
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import java.util.stream.Collectors;
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public class TitleCaseConverter {
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private static final String WORD_SEPARATOR = " ";
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public static String convertToTitleCaseIteratingChars(String text) {
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if (text == null || text.isEmpty()) {
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return text;
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}
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StringBuilder converted = new StringBuilder();
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boolean convertNext = true;
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for (char ch : text.toCharArray()) {
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if (Character.isSpaceChar(ch)) {
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convertNext = true;
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} else if (convertNext) {
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ch = Character.toTitleCase(ch);
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convertNext = false;
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} else {
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ch = Character.toLowerCase(ch);
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}
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converted.append(ch);
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}
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return converted.toString();
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}
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public static String convertToTitleCaseSplitting(String text) {
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if (text == null || text.isEmpty()) {
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return text;
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}
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return Arrays
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.stream(text.split(WORD_SEPARATOR))
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.map(word -> word.isEmpty()
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? word
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: Character.toTitleCase(word.charAt(0)) + word
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.substring(1)
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.toLowerCase())
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.collect(Collectors.joining(WORD_SEPARATOR));
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}
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public static String convertToTitleCaseIcu4j(String text) {
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if (text == null || text.isEmpty()) {
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return text;
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}
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return UCharacter.toTitleCase(text, BreakIterator.getTitleInstance());
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}
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public static String convertToTileCaseWordUtilsFull(String text) {
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return WordUtils.capitalizeFully(text);
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}
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public static String convertToTileCaseWordUtils(String text) {
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return WordUtils.capitalize(text);
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}
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}

‎core-java/src/test/java/com/baeldung/string/TitleCaseConverterUnitTest.java‎

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package com.baeldung.string;
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import org.junit.Assert;
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import org.junit.Test;
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import static org.junit.Assert.*;
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public class TitleCaseConverterUnitTest {
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private static final String TEXT = "tHis IS a tiTLe";
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private static final String TEXT_EXPECTED = "This Is A Title";
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private static final String TEXT_EXPECTED_NOT_FULL = "THis IS A TiTLe";
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private static final String TEXT_OTHER_DELIMITERS = "tHis, IS a tiTLe";
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private static final String TEXT_EXPECTED_OTHER_DELIMITERS = "This, Is A Title";
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private static final String TEXT_EXPECTED_OTHER_DELIMITERS_NOT_FULL = "THis, IS A TiTLe";
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@Test
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public void whenConvertingToTitleCaseIterating_thenStringConverted() {
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assertEquals(TEXT_EXPECTED, TitleCaseConverter.convertToTitleCaseIteratingChars(TEXT));
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}
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@Test
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public void whenConvertingToTitleCaseSplitting_thenStringConverted() {
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assertEquals(TEXT_EXPECTED, TitleCaseConverter.convertToTitleCaseSplitting(TEXT));
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}
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@Test
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public void whenConvertingToTitleCaseUsingWordUtilsFull_thenStringConverted() {
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assertEquals(TEXT_EXPECTED, TitleCaseConverter.convertToTileCaseWordUtilsFull(TEXT));
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}
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@Test
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public void whenConvertingToTitleCaseUsingWordUtils_thenStringConvertedOnlyFirstCharacter() {
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assertEquals(TEXT_EXPECTED_NOT_FULL, TitleCaseConverter.convertToTileCaseWordUtils(TEXT));
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}
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@Test
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public void whenConvertingToTitleCaseUsingIcu4j_thenStringConverted() {
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assertEquals(TEXT_EXPECTED, TitleCaseConverter.convertToTitleCaseIcu4j(TEXT));
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}
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@Test
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public void whenConvertingToTitleCaseWithDifferentDelimiters_thenDelimitersKept() {
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assertEquals(TEXT_EXPECTED_OTHER_DELIMITERS, TitleCaseConverter.convertToTitleCaseIteratingChars(TEXT_OTHER_DELIMITERS));
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assertEquals(TEXT_EXPECTED_OTHER_DELIMITERS, TitleCaseConverter.convertToTitleCaseSplitting(TEXT_OTHER_DELIMITERS));
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assertEquals(TEXT_EXPECTED_OTHER_DELIMITERS, TitleCaseConverter.convertToTileCaseWordUtilsFull(TEXT_OTHER_DELIMITERS));
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assertEquals(TEXT_EXPECTED_OTHER_DELIMITERS_NOT_FULL, TitleCaseConverter.convertToTileCaseWordUtils(TEXT_OTHER_DELIMITERS));
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assertEquals(TEXT_EXPECTED_OTHER_DELIMITERS, TitleCaseConverter.convertToTitleCaseIcu4j(TEXT_OTHER_DELIMITERS));
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}
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@Test
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public void givenNull_whenConvertingToTileCase_thenReturnNull() {
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assertEquals(null, TitleCaseConverter.convertToTitleCaseIteratingChars(null));
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assertEquals(null, TitleCaseConverter.convertToTitleCaseSplitting(null));
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assertEquals(null, TitleCaseConverter.convertToTileCaseWordUtilsFull(null));
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assertEquals(null, TitleCaseConverter.convertToTileCaseWordUtils(null));
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assertEquals(null, TitleCaseConverter.convertToTitleCaseIcu4j(null));
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}
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@Test
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public void givenEmptyString_whenConvertingToTileCase_thenReturnEmptyString() {
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assertEquals("", TitleCaseConverter.convertToTitleCaseIteratingChars(""));
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assertEquals("", TitleCaseConverter.convertToTitleCaseSplitting(""));
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assertEquals("", TitleCaseConverter.convertToTileCaseWordUtilsFull(""));
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assertEquals("", TitleCaseConverter.convertToTileCaseWordUtils(""));
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assertEquals("", TitleCaseConverter.convertToTitleCaseIcu4j(""));
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}
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}

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