Immutable Object VS Mutable Object

In java, there are two types of objects

1.       Immutable object

2.       Mutable object

Q) What is the difference between the immutable object and mutable object? 

Ans):-

Immutable object is a java object. It will not allow modifications on its content, if we are trying to perform operations with immutable object content then data is allowed for the operations, but the resultant data will not be stored in original object, the resultant data will be stored by creating new object

E x:-

All String class objects and all wrapper classes object are immutable objects.

Mutable object is a java object, it able to allow modifications directly on its content.

Ex:-

By default, all java objects are mutable objects.

Ex:-

StringBuffer object is mutable object.

Ex code :-

class Test

{

                public static void main(String[] args)

                {

                                String str1=new String("Sai");

                                String str2=str1.concat(" Software");

                                String str3=str2.concat(" Solution");

                                System.out.println(str1);

                                System.out.println(str2);

                                System.out.println(str3);

                                System.out.println();

                                StringBuffer sb1=new StringBuffer("Sai");

                                StringBuffer sb2=sb1.append(" Software");

                                StringBuffer sb3=sb2.append(" Solution");

                                System.out.println(sb1);

                                System.out.println(sb2);

                                System.out.println(sb3);

                }

}

Output:-

Sai

SaiSoftware

SaiSoftware Solution

SaiSoftware Solution

SaiSoftware Solution

SaiSoftware Solution