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

BAEL-2936

This commit is contained in:
Rodrigo Graciano 2019-06-03 23:34:33 -04:00
parent e4e4a2bfa7
commit 3cea8b6df1
2 changed files with 6 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
java-collections-conversions/src/main/java/com/baeldung/convertToMap/ConvertToMap.java
View File

@ -15,8 +15,7 @@ public class ConvertToMap {
} }
public Map<Integer, Book> listToMapWithDupKey(List<Book> books) { public Map<Integer, Book> listToMapWithDupKey(List<Book> books) {
return books.stream().collect(Collectors.toMap(Book::getReleaseYear, Function.identity(), return books.stream().collect(Collectors.toMap(Book::getReleaseYear, Function.identity(), (existing, replacement) -> existing));
(o1, o2) -> o1));
} }
public Map<Integer, Book> listToConcurrentMap(List<Book> books) { public Map<Integer, Book> listToConcurrentMap(List<Book> books) {

7
java-collections-conversions/src/test/java/com/baeldung/convertToMap/ConvertToMapUnitTest.java
View File

@ -2,6 +2,7 @@ package com.baeldung.convertToMap;
import java.util.ArrayList; import java.util.ArrayList;
import java.util.List; import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap; import java.util.concurrent.ConcurrentHashMap;
import static org.junit.Assert.*; import static org.junit.Assert.*;
@ -34,8 +35,10 @@ public class ConvertToMapUnitTest {
} }
@Test @Test
public void whenMapHasDuplicateKey_with_merge_function() { public void whenMapHasDuplicateKeyThenMergeFunctionHandlesCollision() {
assertTrue(convertToMap.listToMapWithDupKey(bookList).size() == 2); Map<Integer, Book> booksByYear = convertToMap.listToMapWithDupKey(bookList);
assertEquals(2, booksByYear.size());
assertEquals("0395489318", booksByYear.get(1954).getIsbn());
} }
@Test @Test