immutable class in java

Introduction of Immutable Class Immutable class: The so-called immutable class means that once the instance of this class has been created, it cannot change its member variable values.

Recently asked why the string was designed to be immutable, then a little confused, the problem has always been like a bug, unexpectedly did not find, did not think, summed up in this.The 1.String is immutableThe string class is final decorated and is not inheritable or modified . When a string variable is assigned a second time, instead of modifying the data at the original memory address, it re- opens a m

This.myarray = Array.clone (); } }The Getter method returns to the image clone and does not return itselfString ObjectPublic final class String implements Java.io.Serializable, ComparableApplies to constant poolsThread Safetyclass loader to use strings, immutable classes provide security for proper loading for example, if you want to load the Java.sql.Connection

1. PrefaceRecently, I've seen several interesting questions about the Java Core class string. The string class is how to implement its immutable attributes, and the benefits of being designed to be immutable. Why is it not recommended to use the + sign to form a

()); System.out.println ("B:" +b.getdetail () +b.getpostcode () +B.hashcode ()); System.out.println (A.equals (b));}}Results:Cause Analysis:inFinalthe declared method does not allow overwriting, nor does it allow changes, so using final,we can devise a special kind of"Read-only"of the"Immutable Classes". Create"Immutable Classes"Object , the properties of this object cannot be changed .and you cannot deriv

Answer one: One of the most popular Java face questions is: What are immutable objects (immutable object), what are the benefits of immutable objects, what should be used, or more specifically, why should Java string classes be set to i