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Stream API: last Stream element example refactor (#1943)

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* Refactor

* Delete ApplicationContextTestBeanInjectionTypes.java

* Delete BeanInjectionJavaConfigIntegrationTest.java

* Delete BeanInjectionXMLConfigIntegrationTest.java
This commit is contained in:
Grzegorz Piwowarek
2017-06-03 20:49:56 +02:00
committed by GitHub
parent b840f15629
commit a5d5460a9f
22 changed files with 11 additions and 531 deletions
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core-java/src/main/java/com/baeldung/stream/StreamApi.java
+3 -3
View File
@@ -5,17 +5,17 @@ import java.util.stream.Stream;
public class StreamApi {
public String getLastElementUsingReduce(List<String> valueList) {
public static String getLastElementUsingReduce(List<String> valueList) {
Stream<String> stream = valueList.stream();
return stream.reduce((first, second) -> second).orElse(null);
}
public Integer getInfiniteStreamLastElementUsingReduce() {
public static Integer getInfiniteStreamLastElementUsingReduce() {
Stream<Integer> stream = Stream.iterate(0, i -> i + 1);
return stream.limit(20).reduce((first, second) -> second).orElse(null);
}
public String getLastElementUsingSkip(List<String> valueList) {
public static String getLastElementUsingSkip(List<String> valueList) {
long count = valueList.stream().count();
Stream<String> stream = valueList.stream();
return stream.skip(count - 1).findFirst().orElse(null);
core-java/src/test/java/com/baeldung/stream/StreamApiTest.java
+8 -9
View File
@@ -1,41 +1,40 @@
package com.baeldung.stream;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import java.util.ArrayList;
import java.util.List;
import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class StreamApiTest {
private StreamApi streamApi = new StreamApi();
@Test
public void givenList_whenGetLastElementUsingReduce_thenReturnLastElement() {
List<String> valueList = new ArrayList<String>();
List<String> valueList = new ArrayList<>();
valueList.add("Joe");
valueList.add("John");
valueList.add("Sean");
String last = streamApi.getLastElementUsingReduce(valueList);
String last = StreamApi.getLastElementUsingReduce(valueList);
assertEquals("Sean", last);
}
@Test
public void givenInfiniteStream_whenGetInfiniteStreamLastElementUsingReduce_thenReturnLastElement() {
Integer last = streamApi.getInfiniteStreamLastElementUsingReduce();
assertEquals(new Integer(19), last);
int last = StreamApi.getInfiniteStreamLastElementUsingReduce();
assertEquals(19, last);
}
@Test
public void givenListAndCount_whenGetLastElementUsingSkip_thenReturnLastElement() {
List<String> valueList = new ArrayList<String>();
List<String> valueList = new ArrayList<>();
valueList.add("Joe");
valueList.add("John");
valueList.add("Sean");
String last = streamApi.getLastElementUsingSkip(valueList);
String last = StreamApi.getLastElementUsingSkip(valueList);
assertEquals("Sean", last);
}