Can a final class be abstract?

No, An abstract class can't be final because the final and abstract are opposite terms in JAVA. Reason: An abstract class must be inherited by any derived class because a derived class is responsible to provide the implementation of abstract methods of an abstract class.

Can we declare an abstract method as final?

Declaring abstract method final

But, in-case of abstract, you must override an abstract method to use it. Therefore, you cannot use abstract and final together before a method.

Can we develop final abstract class in Java?

The answer is simple, No, it's not possible to have an abstract method in a final class in Java.

Can a final class be instantiated?

You can instantiate a final class just like any other non-abstract class. The only limitation is that you cannot create subclasses of a final class.

Can a final class be inherited?

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 class cant be abstract and final | Can abstract class be final in java | Java interview question

Can we make abstract class as private?

If a method of a class is private, you cannot access it outside the current class, not even from the child classes of it. But, incase of an abstract method, you cannot use it from the same class, you need to override it from subclass and use. Therefore, the abstract method cannot be private.

Can we declare constructor as final?

No, a constructor can't be made final. A final method cannot be overridden by any subclasses. As mentioned previously, the final modifier prevents a method from being modified in a subclass. The main intention of making a method final would be that the content of the method should not be changed by any outsider.

Can we overload constructor?

Constructors can be overloaded in a similar way as function overloading. Overloaded constructors have the same name (name of the class) but the different number of arguments. Depending upon the number and type of arguments passed, the corresponding constructor is called.

Can singleton class be inherited in Java?

Unlike static classes, Singleton classes can be inherited, can have base class, can be serialized and can implement interfaces.

Can a main () method be declared final?

Yes, we can declare the main () method as final in Java. The compiler does not throw any error. If we declare any method as final by placing the final keyword then that method becomes the final method.

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.

Why final and abstract Cannot be used at a time?

If you declare a class abstract, to use it, you must extend it and if you declare a class final you cannot extend it, since both contradict with each other you cannot declare a class both abstract and final if you do so a compile time error will be generated.

Can static method be private?

Static methods can be public or private. The static keyword is placed right after the public/private modifier and right before the type of variables and methods in their declarations.

Can we 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.

Can static fields be changed?

A static variable is common for all instances of the class. A final variable can not change after it has been set the first time. So a static final variable in Java is common for all instances of the class, and it can not be changed after it has been set the first time.

Can static variables be changed c?

When static keyword is used, variable or data members or functions can not be modified again. It is allocated for the lifetime of program.

Can we create immutable class in Java?

Immutable class in java means that once an object is created, we cannot change its content. In Java, all the wrapper classes (like Integer, Boolean, Byte, Short) and String class is immutable. We can create our own immutable class as well.

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 make constructor static?

No, we cannot define a static constructor in Java, If we are trying to define a constructor with the static keyword a compile-time error will occur. In general, static means class level. A constructor will be used to assign initial values for the instance variables.

Can destructor be private?

Private Destructor in C++ Destructors with the access modifier as private are known as Private Destructors. Whenever we want to prevent the destruction of an object, we can make the destructor private.

Can a constructor be virtual?

Virtual Constructor in C++

In C++, the constructor cannot be virtual, because when a constructor of a class is executed there is no virtual table in the memory, means no virtual pointer defined yet. So, the constructor should always be non-virtual. But virtual destructor is possible.

Can we execute a class without a main method?

Yes, we can execute a java program without a main method by using a static block. Static block in Java is a group of statements that gets executed only once when the class is loaded into the memory by Java ClassLoader, It is also known as a static initialization block.

Can we have 2 main methods in Java?

From the above program, we can say that Java can have multiple main methods but with the concept of overloading. There should be only one main method with parameter as string[ ] arg.

Can a main () method be overloaded?

Yes, we can overload the main method in Java, but When we execute the class JVM starts execution with public static void main(String[] args) method.

What happens if I remove static from main method?

1 Answer. If you don't add the 'static' modifier in your main method definition, the compilation of the program will go through without any issues but when you'll try to execute it, a "NoSuchMethodError" error will be thrown.