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[count-upper-lower] extract the impl. from the test methods

This commit is contained in:
Kai.Yuan 2024-02-09 11:19:53 +01:00
parent a7a97689ba
commit 9cbccd4b2f
2 changed files with 42 additions and 32 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:
>>>>>>> be317465c ([count-upper-lower] count upper/lowercase letters)

73
core-java-modules/core-java-string-operations-8/src/test/java/com/baeldung/countupperandlowercasechars/CountUpperAndLowercaseCharsUnitTest.java
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@ -9,50 +9,26 @@ public class CountUpperAndLowercaseCharsUnitTest {
private static final String MY_STRING = "Hi, Welcome to Baeldung! Let's count letters!";
@Test
void whenIteratingCharArrayCompareAndCount_thenGetExpectedResult() {
int upperCount = 0;
int lowerCount = 0;
for (char c : MY_STRING.toCharArray()) {
if (c >= 'A' && c <= 'Z') {
upperCount++;
}
if (c >= 'a' && c <= 'z') {
lowerCount++;
}
}
LetterCount result = new LetterCount(upperCount, lowerCount);
void whenUsingCountByCharacterRange_thenGetExpectedResult() {
LetterCount result = LetterCount.countByCharacterRange(MY_STRING);
assertEquals(4, result.getUppercaseCount());
assertEquals(31, result.getLowercaseCount());
}
@Test
void whenUsingCharacterIsLowerOrUpperCase_thenGetExpectedResult() {
int upperCount = 0;
int lowerCount = 0;
for (char c : MY_STRING.toCharArray()) {
if (Character.isUpperCase(c)) {
upperCount++;
}
if (Character.isLowerCase(c)) {
lowerCount++;
}
}
LetterCount result = new LetterCount(upperCount, lowerCount);
void whenUsingCountByCharacterIsLowerOrUpperCase_thenGetExpectedResult() {
LetterCount result = LetterCount.countByCharacterIsUpperLower(MY_STRING);
assertEquals(4, result.getUppercaseCount());
assertEquals(31, result.getLowercaseCount());
}
@Test
void whenUsingStreamFilterAndCount_thenGetExpectedResult() {
LetterCount result = new LetterCount(
(int) MY_STRING.chars().filter(Character::isUpperCase).count(),
(int) MY_STRING.chars().filter(Character::isLowerCase).count()
);
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'));
@ -64,11 +40,46 @@ class LetterCount {
private int uppercaseCount;
private int lowercaseCount;
public LetterCount(int uppercaseCount, 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;
}