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BAEL-7030 Added the example code (#16085) 

* BAEL-7030 Added the example code

* Removed public modifier
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Muhammad Asif 2024-03-27 21:57:34 +05:00 committed by GitHub
parent dc183332f7
commit 9e21e95e6f
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1 changed files with 54 additions and 0 deletions
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core-java-modules/core-java-collections-5/src/test/java/com/baeldung/immutables/ImmutableCollectionsUnitTest.java Normal file
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package com.baeldung.immutables;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import org.junit.jupiter.api.Test;
class ImmutableCollectionsUnitTest {
@Test
void givenUnmodifiableMap_whenPutNewEntry_thenThrowsUnsupportedOperationException() {
Map<String, String> modifiableMap = new HashMap<>();
modifiableMap.put("name1", "Michael");
modifiableMap.put("name2", "Harry");
Map<String, String> unmodifiableMap = Collections.unmodifiableMap(modifiableMap);
assertThrows(UnsupportedOperationException.class, () -> unmodifiableMap.put("name3", "Micky"));
}
@Test
void givenUnmodifiableMap_whenPutNewEntryUsingOriginalReference_thenSuccess() {
Map<String, String> modifiableMap = new HashMap<>();
modifiableMap.put("name1", "Michael");
modifiableMap.put("name2", "Harry");
Map<String, String> unmodifiableMap = Collections.unmodifiableMap(modifiableMap);
modifiableMap.put("name3", "Micky");
assertEquals(modifiableMap, unmodifiableMap);
assertTrue(unmodifiableMap.containsKey("name3"));
}
@Test
void givenImmutableMap_whenPutNewEntry_thenThrowsUnsupportedOperationException() {
Map<String, String> immutableMap = Map.of("name1", "Michael", "name2", "Harry");
assertThrows(UnsupportedOperationException.class, () -> immutableMap.put("name3", "Micky"));
}
@Test
void givenImmutableMap_whenUsecopyOf_thenExceptionOnPut() {
Map<String, String> immutableMap = Map.of("name1", "Michael", "name2", "Harry");
Map<String, String> copyOfImmutableMap = Map.copyOf(immutableMap);
assertThrows(UnsupportedOperationException.class, () -> copyOfImmutableMap.put("name3", "Micky"));
}
}