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BAEL-6024 - Guide to YugabyteDB

This commit is contained in:
alexandru.borza 2023-05-31 23:00:07 +03:00
parent e647b112da
commit 62d4a6e4de
2 changed files with 0 additions and 63 deletions
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16
core-java-modules/core-java-regex-2/src/main/java/com/baeldung/firstoccurrenceofaninteger/FirstOccurrenceOfAnInteger.java
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package com.baeldung.firstoccurrenceofaninteger;
public class FirstOccurrenceOfAnInteger {
public static Integer findFirstInteger(String s) {
int i = 0;
while (i < s.length() && !Character.isDigit(s.charAt(i))) {
i++;
}
int j = i;
while (j < s.length() && Character.isDigit(s.charAt(j))) {
j++;
}
return Integer.parseInt(s.substring(i, j));
}
}

47
core-java-modules/core-java-regex-2/src/test/java/com/baeldung/firstoccurrenceofaninteger/FirstOccurrenceOfAnIntegerTests.java
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package com.baeldung.firstoccurrenceofaninteger;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.Assertions;
class FirstOccurrenceOfAnIntegerTests {
@Test
public void whenUsingPatternMatcher_findFirstInteger() {
String s = "ba31dung123";
Matcher matcher = Pattern.compile("\\d+").matcher(s);
matcher.find();
int i = Integer.parseInt(matcher.group());
Assertions.assertEquals(31, i);
}
@Test
public void whenUsingScanner_findFirstInteger() {
int i = new Scanner("ba31dung123").useDelimiter("\\D+").nextInt();
Assertions.assertEquals(31, i);
}
@Test
public void whenUsingSplit_findFirstInteger() {
String str = "ba31dung123";
List<String> tokens = Arrays.stream(str.split("\\D+"))
.filter(s -> s.length() > 0).collect(Collectors.toList());
Assertions.assertEquals(31, Integer.parseInt(tokens.get(0)));
}
@Test
public void whenUsingCustomFunction_findFirstInteger() {
String str = "ba31dung123";
Integer i = FirstOccurrenceOfAnInteger.findFirstInteger(str);
Assertions.assertEquals(31, i);
}
}