[modify-print-list] modify + print a list
This commit is contained in:
parent
bd36eddeca
commit
0648a4f918
|
@ -0,0 +1,56 @@
|
|||
package com.baeldung.modifyandprint;
|
||||
|
||||
import static org.junit.jupiter.api.Assertions.assertEquals;
|
||||
|
||||
import java.util.List;
|
||||
import java.util.stream.Collectors;
|
||||
|
||||
import org.junit.jupiter.api.Test;
|
||||
import org.slf4j.Logger;
|
||||
import org.slf4j.LoggerFactory;
|
||||
|
||||
import com.google.common.collect.Lists;
|
||||
|
||||
public class ModifyAndPrintListElementsUnitTest {
|
||||
|
||||
private final Logger log = LoggerFactory.getLogger(ModifyAndPrintListElementsUnitTest.class);
|
||||
|
||||
@Test
|
||||
void whenPrintingInForEach_thenListIsPrinted() {
|
||||
List<String> theList = Lists.newArrayList("Kai", "Liam", "Eric", "Kevin");
|
||||
theList.forEach(e -> log.info(e));
|
||||
}
|
||||
|
||||
@Test
|
||||
void whenUsingModifyAndPrintingSeparately_thenListIsModifiedAndPrinted() {
|
||||
List<String> theList = Lists.newArrayList("Kai", "Liam", "Eric", "Kevin");
|
||||
theList.replaceAll(e -> e.toUpperCase());
|
||||
theList.forEach(e -> log.info(e));
|
||||
assertEquals(List.of("KAI", "LIAM", "ERIC", "KEVIN"), theList);
|
||||
}
|
||||
|
||||
@Test
|
||||
void whenPrintingInMap_thenStreamIsModifiedAndPrinted() {
|
||||
List<String> theList = List.of("Kai", "Liam", "Eric", "Kevin");
|
||||
List<String> newList = theList.stream()
|
||||
.map(e -> {
|
||||
String newElement = e.toUpperCase();
|
||||
log.info(newElement);
|
||||
return newElement;
|
||||
})
|
||||
.filter(e -> e.length() == 4)
|
||||
.collect(Collectors.toList());
|
||||
assertEquals(List.of("LIAM", "ERIC"), newList);
|
||||
}
|
||||
|
||||
@Test
|
||||
void whenPrintingInPeek_thenStreamIsModifiedAndPrinted() {
|
||||
List<String> theList = List.of("Kai", "Liam", "Eric", "Kevin");
|
||||
List<String> newList = theList.stream()
|
||||
.map(e -> e.toUpperCase())
|
||||
.peek(e -> log.info(e))
|
||||
.filter(e -> e.length() == 4)
|
||||
.collect(Collectors.toList());
|
||||
assertEquals(List.of("LIAM", "ERIC"), newList);
|
||||
}
|
||||
}
|
Loading…
Reference in New Issue