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What happens if we try to extend a final class in java?
In Java final is the access modifier which can be used with a filed class and a method.
- When a method if final it cannot be overridden.
- When a variable is final its value cannot be modified further.
- When a class is finale it cannot be extended.
Extending a final class
When we try to extend a final class that will lead to a compilation error saying “cannot inherit from final SuperClass”
Example
In the following Java program, we have a final class with name SuperClass and we are trying to inherent it from another class (SubClass).
final class SuperClass{
public void display() {
System.out.println("This is a method of the superclass");
}
}
public class SubClass extends SuperClass{
public static void main(String args[]){
//Calling method of the superclass
new SubClass().display();
}
}Compile time error
On compiling, this program generates a compilation error as shown below −
Output
SubClass.java:7: error: cannot inherit from final SuperClass
public class SubClass extends SuperClass{
^
1 error
Updated on: 29-Jul-2021
2K+ Views
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