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BAEL-4719 - Using the Map.Entry Java Class (#10428)

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* BAEL-4719

Using the Map.Entry Java Class

* BAEL-4719

Using the Map.Entry Java Class

* BAEL-4719

Change description

* BAEL-4719

Feedback from first draft
This commit is contained in:
dvyshd
2021-01-28 23:53:49 +00:00
committed by GitHub
parent a478360382
commit ab0b2df9e4
4 changed files with 127 additions and 0 deletions
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33
java-collections-maps-3/src/test/java/com/baeldung/map/entry/MapEntryUnitTest.java Normal file
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package com.baeldung.map.entry;
import org.junit.Test;
import java.util.*;
import static org.junit.Assert.assertEquals;
public class MapEntryUnitTest {
@Test
public void givenSimpleEntryList_whenAddDuplicateKey_thenDoesNotOverwriteExistingKey() {
List<Map.Entry<String, Book>> orderedTuples = new ArrayList<>();
orderedTuples.add(new AbstractMap.SimpleEntry<>("9780134685991", new Book("Effective Java 3d Edition", "Joshua Bloch")));
orderedTuples.add(new AbstractMap.SimpleEntry<>("9780132350884", new Book("Clean Code", "Robert C Martin")));
orderedTuples.add(new AbstractMap.SimpleEntry<>("9780132350884", new Book("Clean Code", "Robert C Martin")));
assertEquals(3, orderedTuples.size());
assertEquals("9780134685991", orderedTuples.get(0).getKey());
assertEquals("9780132350884", orderedTuples.get(1).getKey());
assertEquals("9780132350884", orderedTuples.get(2).getKey());
}
@Test
public void givenRegularMap_whenAddDuplicateKey_thenOverwritesExistingKey() {
Map<String, Book> entries = new HashMap<>();
entries.put("9780134685991", new Book("Effective Java 3d Edition", "Joshua Bloch"));
entries.put("9780132350884", new Book("Clean Code", "Robert C Martin"));
entries.put("9780132350884", new Book("Clean Code", "Robert C Martin"));
assertEquals(2, entries.size());
}
}