What is immutable class How it will created in java ?

Question

Hi We want to make my class immutable like as String class in java How can make it .

Vulpes · Answer

To make your class immutable you need to follow the guidelines set out in this article: http://www.javapractices.com/topic/TopicAction.do?Id=29

Satyapriya Nayak · Answer

Hi Abhishek import java . lang . reflect . Field ; public class MutableString { public static void main ( String [] argv ) { String s = Immutable ; String t = Notreally ; mutate ( s  t ); StdOut . println ( t ); // strings are interned so this doesn't print Immutable StdOut . println ( Immutable ); } // change the first min(|s| |t|) characters of s to t public static void mutate ( String s  String t ) { try { Field val = String . class . getDeclaredField ( value ); Field off = String . class . getDeclaredField ( offset ); val . setAccessible ( true ); off . setAccessible ( true ); int offset = off . getInt ( s ); char [] value = ( char []) val . get ( s ); for ( int i = 0 ; i Math . min ( s . length () t . length ()); i ++) value [ offset + i ] = t . charAt ( i ); } catch ( Exception e ) { e . printStackTrace (); } } } Please refer the below link http://algs4.cs.princeton.edu/12oop/MutableString.java.html Thanks