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JAVA-11382 Update article Create an empty map in Java (#12383)

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anuragkumawat 2022-06-20 18:46:31 +05:30 committed by GitHub
parent 150bdb070b
commit 033ddb7a41
2 changed files with 11 additions and 1 deletions
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7
core-java-modules/core-java-collections-4/src/main/java/com/baeldung/maps/initialize/EmptyMapInitializer.java
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@ -32,7 +32,7 @@ public class EmptyMapInitializer {
return emptyMap; return emptyMap;
} }
public Map createGenericEmptyMapUsingMapsObject() { public Map createGenericEmptyMapUsingGuavaMapsObject() {
Map genericEmptyMap = Maps.<String, Integer>newHashMap(); Map genericEmptyMap = Maps.<String, Integer>newHashMap();
return genericEmptyMap; return genericEmptyMap;
} }
@ -43,6 +43,11 @@ public class EmptyMapInitializer {
return emptyMapUsingGuava; return emptyMapUsingGuava;
} }
public static Map<String, String> createImmutableMapUsingGuava() {
Map<String, String> emptyImmutableMapUsingGuava = ImmutableMap.of();
return emptyImmutableMapUsingGuava;
}
public SortedMap<String, String> createEmptySortedMap() { public SortedMap<String, String> createEmptySortedMap() {
SortedMap<String, String> sortedMap = Collections.emptySortedMap(); SortedMap<String, String> sortedMap = Collections.emptySortedMap();
return sortedMap; return sortedMap;

5
core-java-modules/core-java-collections-4/src/test/java/com/baeldung/maps/initialize/EmptyMapInitializerUnitTest.java
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@ -28,4 +28,9 @@ public class EmptyMapInitializerUnitTest {
assertFalse(emptyMapUsingGuava.isEmpty()); assertFalse(emptyMapUsingGuava.isEmpty());
} }
@Test(expected=UnsupportedOperationException.class)
public void givenImmutableEmptyMapUsingGuava_whenAddingEntries_throwsException() {
Map<String, String> map = EmptyMapInitializer.createImmutableMapUsingGuava();
map.put("key", "value");
}
} }