No, you CAN assign a value to the final variable because final variables that haven't been assigned a value can only be assigned one when a constructor is called for initialization and no other way. Also, a final variable can only be assigned its final value with the help of a constructor call ONCE for a particular instance.
Refer to the following code:
class abc{
final int a;
public abc(int b){
a=b;
}
public static void main(String arg[])
{
abc obj1=new abc(3);
abc obj2=new abc(2);
System.out.println(obj1.a);
System.out.println(obj2.a);
System.out.println(obj1.a);
}}
Output:
3
2
3
As we can see here, we initialized the values of a for every instance through constructor. If we change the code slightly and make one small edit in the constructor code:
public abc(int b){
a=b;
a++; //addition
}
Output:
error: variable a might already have been assigned
a++;
This happens because after assigning the value of a once, we try to change it and that isn't possble in final variables.
Back
