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[JAVA-5783] stream to iterable (#13369) 

* [JAVA-5783] stream to iterable

* [JAVA-5783] tests refactor

---------

Co-authored-by: Bhaskar <bhaskar.dastidar@freshworks.com>
This commit is contained in:
Bhaskar Ghosh Dastidar 2023-01-31 08:16:11 +05:30 committed by GitHub
parent b40a061969
commit 9d3667ac77
2 changed files with 90 additions and 0 deletions
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42
core-java-modules/core-java-streams-4/src/main/java/com/baeldung/streams/streamtoiterable/StreamToIterable.java Normal file
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package com.baeldung.streams.streamtoiterable;
import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import joptsimple.internal.Strings;
public class StreamToIterable {
public String streamToIterableLambda(List<String> listOfStrings) {
Stream<String> stringStream = listOfStrings.stream();
StringBuilder sentence = new StringBuilder();
for (String eachString : (Iterable<String>) () -> stringStream.iterator()) {
doSomethingOnString(eachString, sentence);
}
return sentence.toString();
}
public String streamToIterableMethodReference(List<String> listOfStrings) {
Stream<String> stringStream = listOfStrings.stream();
StringBuilder sentence = new StringBuilder();
for (String eachString : (Iterable<String>) stringStream::iterator) {
doSomethingOnString(eachString, sentence);
}
return sentence.toString();
}
public String streamToList(List<String> listOfStrings) {
Stream<String> stringStream = listOfStrings.stream();
StringBuilder sentence = new StringBuilder();
for (String eachString : stringStream.collect(Collectors.toList())) {
doSomethingOnString(eachString, sentence);
}
return sentence.toString();
}
private void doSomethingOnString(String s, StringBuilder sentence) {
if (!Strings.isNullOrEmpty(s)) {
sentence.append(s);
}
}
}

48
core-java-modules/core-java-streams-4/src/test/java/com/baeldung/streams/streamtoiterable/StreamToIterableUnitTest.java Normal file
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package com.baeldung.streams.streamtoiterable;
import java.util.ArrayList;
import java.util.List;
import org.junit.Assert;
import org.junit.Test;
public class StreamToIterableUnitTest {
@Test
public void givenList_whenLambdaIsUsed_ThenStreamAsIterable(){
StreamToIterable streamToIterable = new StreamToIterable();
String actualString = streamToIterable.streamToIterableLambda(getListOfStrings());
String expectedString = "Thisisasentencewithnospaces";
Assert.assertEquals(expectedString, actualString);
}
@Test
public void givenList_whenMethodReferenceIsUsed_ThenStreamAsIterable(){
StreamToIterable streamToIterable = new StreamToIterable();
String actualString = streamToIterable.streamToIterableMethodReference(getListOfStrings());
String expectedString = "Thisisasentencewithnospaces";
Assert.assertEquals(expectedString, actualString);
}
@Test
public void givenList_whenCollectedToList_ThenStreamAsIterable(){
StreamToIterable streamToIterable = new StreamToIterable();
String actualString = streamToIterable.streamToList(getListOfStrings());
String expectedString = "Thisisasentencewithnospaces";
Assert.assertEquals(expectedString, actualString);
}
private List<String> getListOfStrings(){
List<String> listOfStrings = new ArrayList<>();
listOfStrings.add("This");
listOfStrings.add("is");
listOfStrings.add("a");
listOfStrings.add(null);
listOfStrings.add("sentence");
listOfStrings.add("with");
listOfStrings.add("no");
listOfStrings.add(null);
listOfStrings.add("spaces");
return listOfStrings;
}
}