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Move articles out of java-strings part1

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This commit is contained in:
catalin-burcea
2019-10-12 22:15:42 +03:00
parent 0b6f07b8ba
commit a97793396f
27 changed files with 309 additions and 181 deletions
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7
java-strings/README.md
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@@ -4,21 +4,16 @@ This module contains articles about strings in Java.
### Relevant Articles:
- [String Operations with Java Streams](https://www.baeldung.com/java-stream-operations-on-strings)
- [Converting String to Stream of chars](https://www.baeldung.com/java-string-to-stream)
- [Java 8 StringJoiner](https://www.baeldung.com/java-string-joiner)
- [Converting Strings to Enums in Java](https://www.baeldung.com/java-string-to-enum)
- [Quick Guide to the Java StringTokenizer](https://www.baeldung.com/java-stringtokenizer)
- [Use char[] Array Over a String for Manipulating Passwords in Java?](https://www.baeldung.com/java-storing-passwords)
- [Convert a String to Title Case](https://www.baeldung.com/java-string-title-case)
- [Compact Strings in Java 9](https://www.baeldung.com/java-9-compact-string)
- [Java Check a String for Lowercase/Uppercase Letter, Special Character and Digit](https://www.baeldung.com/java-lowercase-uppercase-special-character-digit-regex)
- [Convert java.util.Date to String](https://www.baeldung.com/java-util-date-to-string)
- [Converting a Stack Trace to a String in Java](https://www.baeldung.com/java-stacktrace-to-string)
- [Sorting a String Alphabetically in Java](https://www.baeldung.com/java-sort-string-alphabetically)
- [String Not Empty Test Assertions in Java](https://www.baeldung.com/java-assert-string-not-empty)
- [String Performance Hints](https://www.baeldung.com/java-string-performance)
- [Using indexOf to Find All Occurrences of a Word in a String](https://www.baeldung.com/java-indexOf-find-string-occurrences)
- [Adding a Newline Character to a String in Java](https://www.baeldung.com/java-string-newline)
- [Remove or Replace part of a String in Java](https://www.baeldung.com/java-remove-replace-string-part)
- [Remove or Replace Part of a String in Java](https://www.baeldung.com/java-remove-replace-string-part)
- [Replace a Character at a Specific Index in a String in Java](https://www.baeldung.com/java-replace-character-at-index)
- More articles: [[next -->]](/java-strings-2)

44
java-strings/src/main/java/com/baeldung/enums/PizzaStatusEnum.java
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@@ -1,44 +0,0 @@
package com.baeldung.enums;
public enum PizzaStatusEnum {
ORDERED(5) {
@Override
public boolean isOrdered() {
return true;
}
},
READY(2) {
@Override
public boolean isReady() {
return true;
}
},
DELIVERED(0) {
@Override
public boolean isDelivered() {
return true;
}
};
private int timeToDelivery;
public boolean isOrdered() {
return false;
}
public boolean isReady() {
return false;
}
public boolean isDelivered() {
return false;
}
public int getTimeToDelivery() {
return timeToDelivery;
}
PizzaStatusEnum(int timeToDelivery) {
this.timeToDelivery = timeToDelivery;
}
}

69
java-strings/src/main/java/com/baeldung/string/TitleCaseConverter.java
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@@ -1,69 +0,0 @@
package com.baeldung.string;
import java.util.Arrays;
import java.util.stream.Collectors;
import org.apache.commons.lang3.text.WordUtils;
import com.ibm.icu.lang.UCharacter;
import com.ibm.icu.text.BreakIterator;
public class TitleCaseConverter {
private static final String WORD_SEPARATOR = " ";
public static String convertToTitleCaseIteratingChars(String text) {
if (text == null || text.isEmpty()) {
return text;
}
StringBuilder converted = new StringBuilder();
boolean convertNext = true;
for (char ch : text.toCharArray()) {
if (Character.isSpaceChar(ch)) {
convertNext = true;
} else if (convertNext) {
ch = Character.toTitleCase(ch);
convertNext = false;
} else {
ch = Character.toLowerCase(ch);
}
converted.append(ch);
}
return converted.toString();
}
public static String convertToTitleCaseSplitting(String text) {
if (text == null || text.isEmpty()) {
return text;
}
return Arrays
.stream(text.split(WORD_SEPARATOR))
.map(word -> word.isEmpty()
? word
: Character.toTitleCase(word.charAt(0)) + word
.substring(1)
.toLowerCase())
.collect(Collectors.joining(WORD_SEPARATOR));
}
public static String convertToTitleCaseIcu4j(String text) {
if (text == null || text.isEmpty()) {
return text;
}
return UCharacter.toTitleCase(text, BreakIterator.getTitleInstance());
}
public static String convertToTileCaseWordUtilsFull(String text) {
return WordUtils.capitalizeFully(text);
}
public static String convertToTileCaseWordUtils(String text) {
return WordUtils.capitalize(text);
}
}

62
java-strings/src/test/java/com/baeldung/StringToIntOrIntegerUnitTest.java
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@@ -1,62 +0,0 @@
package com.baeldung;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.Test;
import com.google.common.primitives.Ints;
public class StringToIntOrIntegerUnitTest {
@Test
public void givenString_whenParsingInt_shouldConvertToInt() {
String givenString = "42";
int result = Integer.parseInt(givenString);
assertThat(result).isEqualTo(42);
}
@Test
public void givenString_whenCallingIntegerValueOf_shouldConvertToInt() {
String givenString = "42";
Integer result = Integer.valueOf(givenString);
assertThat(result).isEqualTo(new Integer(42));
}
@Test
public void givenString_whenCallingIntegerConstructor_shouldConvertToInt() {
String givenString = "42";
Integer result = new Integer(givenString);
assertThat(result).isEqualTo(new Integer(42));
}
@Test
public void givenString_whenCallingIntegerDecode_shouldConvertToInt() {
String givenString = "42";
int result = Integer.decode(givenString);
assertThat(result).isEqualTo(42);
}
@Test
public void givenString_whenTryParse_shouldConvertToInt() {
String givenString = "42";
Integer result = Ints.tryParse(givenString);
assertThat(result).isEqualTo(42);
}
@Test(expected = NumberFormatException.class)
public void givenInvalidInput_whenParsingInt_shouldThrow() {
String givenString = "nan";
Integer.parseInt(givenString);
}
}

27
java-strings/src/test/java/com/baeldung/enums/PizzaUnitTest.java
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@@ -1,27 +0,0 @@
package com.baeldung.enums;
import static junit.framework.TestCase.assertTrue;
import org.junit.Test;
public class PizzaUnitTest {
@Test
public void whenConvertedIntoEnum_thenGetsConvertedCorrectly() {
String pizzaEnumValue = "READY";
PizzaStatusEnum pizzaStatusEnum = PizzaStatusEnum.valueOf(pizzaEnumValue);
assertTrue(pizzaStatusEnum == PizzaStatusEnum.READY);
}
@Test(expected = IllegalArgumentException.class)
public void whenConvertedIntoEnum_thenThrowsException() {
String pizzaEnumValue = "rEAdY";
PizzaStatusEnum pizzaStatusEnum = PizzaStatusEnum.valueOf(pizzaEnumValue);
}
@Test(expected = IllegalArgumentException.class)
public void givenInvalidEnumValueContentWiseAsString_whenConvertedIntoEnum_thenThrowsException() {
String pizzaEnumValue = "invalid";
PizzaStatusEnum pizzaStatusEnum = PizzaStatusEnum.valueOf(pizzaEnumValue);
}
}

59
java-strings/src/test/java/com/baeldung/string/StringToCharStreamUnitTest.java
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@@ -1,59 +0,0 @@
package com.baeldung.string;
import org.junit.Test;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import java.util.stream.Stream;
import static org.hamcrest.CoreMatchers.instanceOf;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertThat;
public class StringToCharStreamUnitTest {
private String testString = "Tests";
@Test
public void givenTestString_whenChars_thenReturnIntStream() {
assertThat(testString.chars(), instanceOf(IntStream.class));
}
@Test
public void givenTestString_whenCodePoints_thenReturnIntStream() {
assertThat(testString.codePoints(), instanceOf(IntStream.class));
}
@Test
public void givenTestString_whenCodePoints_thenShowOccurences() throws Exception {
Map<Character, Integer> map = testString.codePoints()
.mapToObj(c -> (char) c)
.filter(Character::isLetter)
.collect(Collectors.toMap(c -> c, c -> 1, Integer::sum));
System.out.println(map);
}
@Test
public void givenIntStream_whenMapToObj_thenReturnCharacterStream() {
Stream<Character> characterStream = testString.chars()
.mapToObj(c -> (char) c);
Stream<Character> characterStream1 = testString.codePoints()
.mapToObj(c -> (char) c);
assertNotNull("IntStream returned by chars() did not map to Stream<Character>", characterStream);
assertNotNull("IntStream returned by codePoints() did not map to Stream<Character>", characterStream1);
}
@Test
public void givenIntStream_whenMapToObj_thenReturnStringStream() {
List<String> strings = testString.codePoints()
.mapToObj(c -> String.valueOf((char) c))
.collect(Collectors.toList());
assertEquals(strings.size(), 5);
}
}

70
java-strings/src/test/java/com/baeldung/string/TitleCaseConverterUnitTest.java
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@@ -1,70 +0,0 @@
package com.baeldung.string;
import org.junit.Assert;
import org.junit.Test;
import static org.junit.Assert.*;
public class TitleCaseConverterUnitTest {
private static final String TEXT = "tHis IS a tiTLe";
private static final String TEXT_EXPECTED = "This Is A Title";
private static final String TEXT_EXPECTED_NOT_FULL = "THis IS A TiTLe";
private static final String TEXT_OTHER_DELIMITERS = "tHis, IS a tiTLe";
private static final String TEXT_EXPECTED_OTHER_DELIMITERS = "This, Is A Title";
private static final String TEXT_EXPECTED_OTHER_DELIMITERS_NOT_FULL = "THis, IS A TiTLe";
@Test
public void whenConvertingToTitleCaseIterating_thenStringConverted() {
assertEquals(TEXT_EXPECTED, TitleCaseConverter.convertToTitleCaseIteratingChars(TEXT));
}
@Test
public void whenConvertingToTitleCaseSplitting_thenStringConverted() {
assertEquals(TEXT_EXPECTED, TitleCaseConverter.convertToTitleCaseSplitting(TEXT));
}
@Test
public void whenConvertingToTitleCaseUsingWordUtilsFull_thenStringConverted() {
assertEquals(TEXT_EXPECTED, TitleCaseConverter.convertToTileCaseWordUtilsFull(TEXT));
}
@Test
public void whenConvertingToTitleCaseUsingWordUtils_thenStringConvertedOnlyFirstCharacter() {
assertEquals(TEXT_EXPECTED_NOT_FULL, TitleCaseConverter.convertToTileCaseWordUtils(TEXT));
}
@Test
public void whenConvertingToTitleCaseUsingIcu4j_thenStringConverted() {
assertEquals(TEXT_EXPECTED, TitleCaseConverter.convertToTitleCaseIcu4j(TEXT));
}
@Test
public void whenConvertingToTitleCaseWithDifferentDelimiters_thenDelimitersKept() {
assertEquals(TEXT_EXPECTED_OTHER_DELIMITERS, TitleCaseConverter.convertToTitleCaseIteratingChars(TEXT_OTHER_DELIMITERS));
assertEquals(TEXT_EXPECTED_OTHER_DELIMITERS, TitleCaseConverter.convertToTitleCaseSplitting(TEXT_OTHER_DELIMITERS));
assertEquals(TEXT_EXPECTED_OTHER_DELIMITERS, TitleCaseConverter.convertToTileCaseWordUtilsFull(TEXT_OTHER_DELIMITERS));
assertEquals(TEXT_EXPECTED_OTHER_DELIMITERS_NOT_FULL, TitleCaseConverter.convertToTileCaseWordUtils(TEXT_OTHER_DELIMITERS));
assertEquals(TEXT_EXPECTED_OTHER_DELIMITERS, TitleCaseConverter.convertToTitleCaseIcu4j(TEXT_OTHER_DELIMITERS));
}
@Test
public void givenNull_whenConvertingToTileCase_thenReturnNull() {
assertEquals(null, TitleCaseConverter.convertToTitleCaseIteratingChars(null));
assertEquals(null, TitleCaseConverter.convertToTitleCaseSplitting(null));
assertEquals(null, TitleCaseConverter.convertToTileCaseWordUtilsFull(null));
assertEquals(null, TitleCaseConverter.convertToTileCaseWordUtils(null));
assertEquals(null, TitleCaseConverter.convertToTitleCaseIcu4j(null));
}
@Test
public void givenEmptyString_whenConvertingToTileCase_thenReturnEmptyString() {
assertEquals("", TitleCaseConverter.convertToTitleCaseIteratingChars(""));
assertEquals("", TitleCaseConverter.convertToTitleCaseSplitting(""));
assertEquals("", TitleCaseConverter.convertToTileCaseWordUtilsFull(""));
assertEquals("", TitleCaseConverter.convertToTileCaseWordUtils(""));
assertEquals("", TitleCaseConverter.convertToTitleCaseIcu4j(""));
}
}