BAEL-2936
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e4e4a2bfa7
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@ -15,8 +15,7 @@ public class ConvertToMap {
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}
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public Map<Integer, Book> listToMapWithDupKey(List<Book> books) {
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return books.stream().collect(Collectors.toMap(Book::getReleaseYear, Function.identity(),
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(o1, o2) -> o1));
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return books.stream().collect(Collectors.toMap(Book::getReleaseYear, Function.identity(), (existing, replacement) -> existing));
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}
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public Map<Integer, Book> listToConcurrentMap(List<Book> books) {
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@ -2,6 +2,7 @@ package com.baeldung.convertToMap;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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import static org.junit.Assert.*;
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@ -34,8 +35,10 @@ public class ConvertToMapUnitTest {
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}
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@Test
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public void whenMapHasDuplicateKey_with_merge_function() {
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assertTrue(convertToMap.listToMapWithDupKey(bookList).size() == 2);
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public void whenMapHasDuplicateKeyThenMergeFunctionHandlesCollision() {
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Map<Integer, Book> booksByYear = convertToMap.listToMapWithDupKey(bookList);
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assertEquals(2, booksByYear.size());
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assertEquals("0395489318", booksByYear.get(1954).getIsbn());
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}
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@Test
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