point.comJava Final Keyword
In Java language, the final is the keyword. The final can apply to the variable, method, and class.
Syntax:
final
Final Variable
A final variable can't able to change. It is a constant variable.
Example:-
class B
{
final int a=5;// final varibale
void showdata()
{
// a=9; It can't change the value of a. It throw compile error.
System.out.println("Derived class a value: "+ a);
}
}
public class Finalvariable
{
public static void main(String args[])
{
B b= new B();
b.showdata();
}
}
Example:-
To invoke the base class method using super keyword.
class A
{
int a=10;
final void showdata() // final method
{
System.out.println("Base class a value: "+ a);
}
}
class B extends A{
int a=5;
void showdata()
{
System.out.println("Derived class a value: "+ a);
}
}
public class Finalmethod
{
public static void main(String args[])
{
B b= new B();
b.showdata();
}
}
Final Class
A final class can't able to extend the class.
Example:-
To invoke the base class constructor using super keyword.
final class A // final class
{
int a=10;
A()
{
System.out.println("Base class a value: "+ a);
}
}
class B extends A{
int a=5;
B()
{
System.out.println("Derived class a value: "+ a);
}
}
public class Finalclass
{
public static void main(String args[])
{
B b= new B();
}
}
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