class abc

{

abc(){num=30;}

//const to make constant in c

final float PI=3.14F; //read only variable

final int num;//blank final variable

void fxn()

{

// PI=50; //error we cannot change a constant value

//num=100; //you can't initialize here

final char ch;

ch='A';

System.out.println("the value of pi and num is "+PI+" "+num);

System.out.println("the value of pi and ch is "+PI+" "+ch);

}

}

class Main

{

public static void main(String[] args) {

abc obj=new abc();

obj.fxn();

}

}

//if you use final keyword before any variable then u cannot change it's value (i.e final makes variable constant)

//you cannot initialize a blank final variable in a function

//you can declare/initialize and use a blank final variable in any function locally

//you can initialize a blank final instance variable in a constructor