How to create Immutable Class and Object in Java - Tutorial Example Writing or creating immutable classes in Java is becoming popular day by day, because of the concurrency and multithreading advantages provided by immutable objects. Immutable objects offer several benefits over a conventional mutable object, especially while creating concurrent Java applications. An immutable object not only guarantees the safe publication of an object’s state but also can be shared among other threads without any external synchronization. In fact, JDK itself contains several immutable classes like String , Integer , and other wrapper classes. For those who don’t know, immutable objects are those whose state cannot be changed once created. A good example is java.lang.String — once created, a String object cannot be modified. Any operation that seems to modify a String object (like trim() , toUpperCase() , etc.) actually results in a new object. What is an Immutable Class in Java? An immutabl
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