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BAEL-2800_Copying_a_HashMap_in_Java

This commit is contained in:
Anshul Bansal 2019-04-06 07:49:57 +03:00
parent 96903671b6
commit 68ffec2c2c
2 changed files with 1 additions and 24 deletions
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9
core-java-collections-2/src/main/java/com/baeldung/copyinghashmap/CopyHashMap.java
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@ -43,15 +43,6 @@ public class CopyHashMap {
return copyMap;
}
public static HashMap copyMapAndDivideValuesBy2(HashMap originalMap) {
Set<Map.Entry> entries = originalMap.entrySet();
HashMap copyMap = (HashMap) entries
.stream()
.collect(Collectors.toMap(mapEntry -> mapEntry.getKey(), mapEntry -> (int)mapEntry.getValue()/2));
return copyMap;
}
public static HashMap shallowCopy(HashMap originalMap) {
return (HashMap) originalMap.clone();
}

16
core-java-collections-2/src/test/java/com/baeldung/copyinghashmap/CopyHashMapUnitTest.java
View File

@ -58,21 +58,7 @@ public class CopyHashMapUnitTest {
assertThat(deepCopy.get("emp1")).isNotEqualTo(map.get("emp1"));
}
@Test
public void givenHashMap_whenCopy_thenCopyMapShouldHaveValuesDivideBy2() {
HashMap<String, Integer> heightMap = new HashMap<>();
heightMap.put("emp1", 160);
heightMap.put("emp2", 165);
heightMap.put("emp3", 163);
HashMap heightMapCopy = CopyHashMap.copyMapAndDivideValuesBy2(heightMap);
assertThat(heightMap).isNotEqualTo(heightMapCopy);
assertThat(heightMap.get("emp1")/2).isEqualTo(heightMapCopy.get("emp1"));
}
}
@Test
public void givenImmutableMap_whenCopyUsingGuava_thenCopyShouldNotChange() {