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Feb 6, 2024 · Conclusion. In conclusion, the choice between mutable and immutable objects in Java plays a crucial role in shaping the reliability, efficiency, and maintainability of your code. While immutability provides thread safety, predictability, and other advantages, mutability offers flexibility and dynamic state changes.
- Imran Alam
Apr 20, 2021 · The main feature of the Arrays.asList method is that the returned list is backed by the specified array, so you can use the Collections methods on the array through this list.
- Introduction
- What Is An Immutable Set?
- Create Immutable Sets in CORE Java
- Create Immutable Sets in Guava
- Conclusion
In this tutorial, we’re going to have a look at different ways of constructing an immutable set in Java. But first, let’s understand the immutable set and see why we need it.
In general, an immutable object will not change its internal state once we create it.This makes it thread-safe by default. The same logic applies to immutable sets. Let’s suppose we have a HashSet instance with some values. Making it immutable will create a “read-only” version of our set. Thus, any attempt to modify its state will throw Unsupported...
With just the core Java classes at our disposal, we can use the Collections.unmodifiableSet() method to wrap the original Set. First, let’s create a simple HashSet instance and initialize it with Stringvalues: Next, let’s wrap it up with Collections.unmodifiableSet(): Finally, to make sure our unmodifiableSetinstance is immutable, let’s create a si...
Another way that we can construct an immutable set is by using Guava’s ImmutableSet class. It copies the existing data into a new immutable instance. As a result, the data inside ImmutableSet won’t change when we alter the original Set. Like the core Java implementation, any attempt to modify the created immutable instance will throw UnsupportedOpe...
In this quick article, we discussed immutable Sets in the Java language. Moreover, we showed how to create immutable Setsusing the Collections API from core Java, Java 9 and the Guava library. Finally, as usual, the complete code for this article is available over on GitHub.
Convenience static factory methods on the List, Set, and Map interfaces let you easily create unmodifiable lists, sets, and maps. A collection is considered unmodifiable if elements cannot be added, removed, or replaced. After you create an unmodifiable instance of a collection, it holds the same data as long as a reference to it exists.
Apr 2, 2024 · We can still add elements or remove elements from it. Only the reference to the set is final. 1. Mutable Empty Set ⮚ Using Plain Java. We can simply use the HashSet constructor, which constructs an empty resizable-array implementation of the Set interface. The following code takes advantage of the new “diamond” syntax introduced in Java SE 7.
Oct 8, 2021 · A String is immutable, period, full stop (unless you bring in some native code using JNI to modify one). The need for immutable String objects was clearly understood by the team who created Java: If String objects could be modified, Java’s entire security model would be broken. Here’s a sketch of one potential attack.
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Interface Set<E>. A collection that contains no duplicate elements. More formally, sets contain no pair of elements e1 and e2 such that e1.equals(e2), and at most one null element. As implied by its name, this interface models the mathematical set abstraction. The Set interface places additional stipulations, beyond those inherited from the ...
