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In Java, a mutable class allows its instances to be modified after creation, offering a different programming paradigm compared to immutable classes. In this section, we will discuss the concept of mutable classes in Java, their characteristics, advantages, and best practices.
Jul 9, 2024 · Mutable class objects are those whose state can be modified after initialization. This means the values of their fields can be changed, add or remove elements from the collections they contain, ie generally alter their internal state. Examples of mutable objects are Java’s StringBuilder, StringBuffer, & java.util.Date.
Feb 6, 2024 · Mutable objects in Java are entities whose state can be modified after their creation. This mutability introduces the concept of changeable internal data, allowing values and properties to be altered during the object’s lifecycle.
- Imran Alam
The Java platform libraries contain many immutable classes, including String, the boxed primitive classes, and BigInte- ger and BigDecimal. There are many good reasons for this: Immutable classes are easier to design, implement and use than mutable classes.
A mutable object can be changed after it's created, and an immutable object can't. In Java, everything (except for strings) is mutable by default: public class IntegerPair { int x; int y; IntegerPair(int x, int y) { this.x = x; this.y = y; } } IntegerPair p = new IntegerPair(5, 10); // p.x = 5, p.y = 10 p.x = 50; // p.x = 50, p.y = 10
In simple terms, when working in Java, deciding between mutable and immutable objects is very important as it affects how reliable, efficient, and maintainable your code will be. Immutable objects ensure thread safety, predictability, and other benefits.
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Apr 3, 2023 · Mutable objects are objects that can be modified after they are initialized. In some cases, these types of classes can be preferred over immutable classes due to their flexibility and mutable fields. Examples of these classes include StringBuffer, StringBuilder, and the Date class found in the Java util package.
