Question: What Happens If We Override Final Method?

Can Run method be overloaded?

Overloading of run() method is possible.

But Thread class start() method can invoke no-argument method.

The other overloaded method we have to call explicitly like a normal method call.

It will be in the same call stack like any other method (if you call from run() method)..

Can final method be extended?

Because final means different things for classes and methods. … A final class cannot be extended. A final method cannot be overridden. A final variable cannot be assigned to after it has been initialized.

What happens if we don’t override Run method?

It is highly recommended to override run() method because it improves the performance of the system. If we don’t override Thread class run() method in our defined thread then Thread class run() method will be executed and we will not get any output because Thread class run() is with an empty implementation.

What method has to be invoked to execute a thread?

Thread#start is a natively implemented method that creates a separate thread and calls Thread ‘s run method, executing the code in the new thread. If the Thread instance was created by passing a Runnable to the Thread ‘s constructor, the Runnable ‘s run method is called.

Can we override main method?

No, we cannot override main method of java because a static method cannot be overridden. The static method in java is associated with class whereas the non-static method is associated with an object.

What is the difference between static and final?

static means there is only one copy of the variable in memory shared by all instances of the class. The final keyword just means the value can’t be changed. Without final , any object can change the value of the variable.

Can we override the final method?

Any method that is declared as final in the superclass cannot be overridden by a subclass.

What will happen if we override start method?

Whenever we override start() method then our start() method will be executed just like a normal method call and new thread wont be created. We can override start/run method of Thread class because it is not final. But it is not recommended to override start() method, otherwise it ruins multi-threading concept.

Can we override private method?

No, we cannot override private or static methods in Java. Private methods in Java are not visible to any other class which limits their scope to the class in which they are declared.

Can we override static method?

Can we Override static methods in java? We can declare static methods with same signature in subclass, but it is not considered overriding as there won’t be any run-time polymorphism. Hence the answer is ‘No’.

Can we inherit private method in Java?

Yes. A java private member cannot be inherited as it is available only to the declared java class. Since the private members cannot be inherited, there is no place for discussion on java runtime overloading or java overriding (polymorphism) features.

Can a final class be inherited?

The final modifier for finalizing the implementations of classes, methods, and variables. The main purpose of using a class being declared as final is to prevent the class from being subclassed. If a class is marked as final then no class can inherit any feature from the final class. You cannot extend a final class.

Why we Cannot override static method?

Overloading is the mechanism of binding the method call with the method body dynamically based on the parameters passed to the method call. Static methods are bonded at compile time using static binding. Therefore, we cannot override static methods in Java.

Is final and Cannot be overridden?

A final method in a superclass cannot be overridden in a subclass—this guarantees that the final method implementation will be used by all direct and indirect subclasses in the hierarchy. Methods that are declared private are implicitly final , because it’s not possible to override them in a subclass.

Can constructor be private?

Yes, we can declare a constructor as private. If we declare a constructor as private we are not able to create an object of a class. We can use this private constructor in the Singleton Design Pattern.

What is method hiding?

Java 8Object Oriented ProgrammingProgramming. When super class and sub class contains same method including parameters and if they are static. The method in the super class will be hidden by the one that is in the sub class. This mechanism is known as method hiding.

Can we declare constructor as final?

No, a constructor can’t be made final. A final method cannot be overridden by any subclasses. … But, in inheritance sub class inherits the members of a super class except constructors. In other words, constructors cannot be inherited in Java therefore, there is no need to write final before constructors.