Immutable Class In Java

String class is immutable class in java . once we create the object of the immutable class we c'nt change that object.
When one object is shared with others and when the value of the object is changed so others also will be affected. To overcome this problem immutable is solution.
When we create the string class object we can't change that object if we will try so that time one new object will be created and the reference of current object will point to new object and than old object will be abandon and eligible for garbage collector.

We can Make our own immutable class .

final  class MakeImutableClass
{
  final String panCardNo;
  public MakeImutableClass(String panCardNo)
{
this.panCardNo=panCardNo;
}
public String getPanCardNo()
{
return panCardNo;
}

}

public class ImmutableClass
{
public static void main(String[] args)
{
MakeImutableClass mic=new MakeImutableClass("first");
MakeImutableClass mic1=new MakeImutableClass("second");


System.out.println("first pan no. is "+mic.getPanCardNo());
System.out.println("second pan no. is " +mic1.getPanCardNo());

}

}