Java Language
- Getting started with Java Language
- Top 10 Java Errors with Solutions
- Awesome Book
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- Immutable Class
- Example with mutable refs
- Example without mutable refs
- Rules to define immutable classes
- What is the advantage of immutability?
- Immutable Objects
- Inheritance
- InputStreams and OutputStreams
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- XOM - XML Object Model
Java Language Immutable Class
Introduction
Immutable objects are instances whose state doesn’t change after it has been initialized. For example, String is an immutable class and once instantiated its value never changes.
Remarks
Some immutable classes in Java:
- java.lang.String
- The wrapper classes for the primitive types: java.lang.Integer, java.lang.Byte, java.lang.Character, java.lang.Short, java.lang.Boolean, java.lang.Long, java.lang.Double, java.lang.Float
- Most enum classes are immutable, but this in fact depends on the concrete case.
- java.math.BigInteger and java.math.BigDecimal (at least objects of those classes themselves)
- java.io.File. Note that this represents an object external to the VM (a file on the local system), which may or may not exist, and has some methods modifying and querying the state of this external object. But the File object itself stays immutable.
Immutable Class Related Examples
- Example with mutable refs
- Example without mutable refs
- Rules to define immutable classes
- What is the advantage of immutability?
