iSharkFly-Docs
/
java-tutorials
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Merge pull request #16146 from danielmcnally285/danielmcnally285_last_n_characters 

BAEL-7600: Get last n characters from a String
This commit is contained in:
Vini 2024-03-31 11:30:59 +02:00 committed by GitHub
parent 39f3c493ac 9439463838
commit 823bbbdae0
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
1 changed files with 64 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

64
core-java-modules/core-java-string-operations-8/src/test/java/com/baeldung/lastncharacters/LastNCharactersUnitTest.java Normal file
View File

@ -0,0 +1,64 @@
package com.baeldung.lastncharacters;
import static org.assertj.core.api.Assertions.assertThat;
import java.util.Arrays;
import java.util.stream.Collectors;
import org.apache.commons.lang3.ArrayUtils;
import org.apache.commons.lang3.StringUtils;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
public class LastNCharactersUnitTest {
private String s;
private int n;
@BeforeEach
void init() {
s = "10-03-2024";
n = 4;
}
@Test
void givenString_whenUsingIntStreamAsStreamSource_thenObtainLastNCharacters() {
String result = s.chars()
.mapToObj(c -> (char) c)
.skip(s.length() - n)
.map(String::valueOf)
.collect(Collectors.joining());
assertThat(result).isEqualTo("2024");
}
@Test
void givenString_whenUsingOneArgSubstringMethod_thenObtainLastNCharacters() {
int beginIndex = s.length() - n;
assertThat(s.substring(beginIndex)).isEqualTo("2024");
}
@Test
void givenString_whenUsingStreamOfCharactersAsSource_thenObtainLastNCharacters() {
String result = Arrays.stream(ArrayUtils.toObject(s.toCharArray()))
.skip(s.length() - n)
.map(String::valueOf)
.collect(Collectors.joining());
assertThat(result).isEqualTo("2024");
}
@Test
void givenString_whenUsingStringUtilsRight_thenObtainLastNCharacters() {
assertThat(StringUtils.right(s, n)).isEqualTo("2024");
}
@Test
void givenString_whenUsingTwoArgSubstringMethod_thenObtainLastNCharacters() {
int beginIndex = s.length() - n;
String result = s.substring(beginIndex, s.length());
assertThat(result).isEqualTo("2024");
}
}