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We are one step closed to immutable class now. Lets change constructor to make deep copy of listOfStates object. 1 2 3 4 5 6 7 8 9 10 11 12 public Country(String countryName, ArrayList listOfStates) { super(); this.countryName = countryName; ArrayList tempList = new ArrayList()...
Here instead of passing reference to the original map, we create a new instance of HashMap, passing it original hashMap and then pass this new instance of HashMap to Collecitons.unmodifiableMap() method.The “unmodifiableMap2” that we get here is immutable such that even if you make chang...
Let’s see how we can use theUnmodifiableMultiValuedMapdecorator to make them immutable: @Test(expected = UnsupportedOperationException.class)publicvoidgivenUnmodifiableMultiValuedMap_whenInserting_thenThrowingException(){ MultiValuedMap<String, String> map =newArrayListValuedHashMap<>(); map.put("key1"...
import org.eclipse.collections.api.block.predicate.Predicate; import org.eclipse.collections.impl.factory.Lists; import org.eclipse.collections.impl.utility.Iterate; import java.util.List; void main() { var persons = Lists.immutable.of( new User("Michael", 34, Gender.MALE), new User("Jane",...
Hence we can’t use the Immutable List that we used in the previous examples.Collection<Integer> collection1 = new ArrayList<>(Arrays.asList(1, 2, 3)); Collection<Integer> collection2 = new ArrayList<>(Arrays.asList(97, 98, 99)); boolean hasModified = collection1.addAll(collection2);...
Due to the numerous trash collection operations involved in string concatenation, it might be inefficient. It will take around 8 seconds to execute the code. You’re probably wondering why string concatenation is so slow. Because the strings are immutable. This indicates that once something is ma...
To avoid this, prefer using Kotlin’s immutable collections. Instead of writing: vallist = arrayListOf<String>() Prefer writing: vallist = listOf<String>() While the first one is creating a mutable list, the second one will create a list without any methods to add or remove elements from...
1.17.How to Make a Java class immutable? An immutable class is one whose state can not be changed once created. There are certain guidelines to create a class immutable in Java and you must know them to answer this question correctly. ...