Question { TCS, 4323 }

can any one send me the example program of immutable class?

Answer

public class ImmutableClass {
int i;
public ImmutableClass(int i)
{
this.i=i;
}
public int getI()
{
return i;
}
public ImmutableClass setI(int i)
{
if(i==this.i)
{
return this;
}
else
return new ImmutableClass(i);
}
public static void main(String args[])
{
ImmutableClass ic = new ImmutableClass(5);
ic.getI();
System.out.println(ic);
ic = ic.setI(10);
System.out.println(ic);
}
}
// If you pass 5 as the value in setter method, you will see
same address. It means whenever you are trying to change the
value of variable, a new object is created and returned. So
your object is immutable.