Question: Why We Cannot Use This And Super In Static Method?

Can you use this () and super () both in a constructor?

Both this() and super() are constructor calls.

Constructor call must always be the first statement.

So you either have super() or this() as first statement.

Both this() and super() are constructor calls, and constructor call must be the first (and only first) call in a constructor..

Can abstract class have constructor?

Yes! Abstract classes can have constructors! Yes, when we define a class to be an Abstract Class it cannot be instantiated but that does not mean an Abstract class cannot have a constructor. Each abstract class must have a concrete subclass which will implement the abstract methods of that abstract class.

Can final static method be overloaded?

Static methods cannot be overridden because they are not dispatched on the object instance at runtime. The compiler decides which method gets called. Static methods can be overloaded (meaning that you can have the same method name for several methods as long as they have different parameter types).

What is difference between final and static?

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.

What happens if I remove static from main method?

That’s why the main method has to be static so that JVM can load the class into memory and call the main method. If the main method won’t be static, JVM would not be able to call it because there is no object of the class is present. Let’s see what happens when we remove static from java main method.

Can we override private and final methods?

No, We can not override private method in Java, just like we can not override static method in Java. … private methods are not even visible to Child class, they are only visible and accessible in the class on which they are declared. private keyword provides highest level of Encapsulation in Java.

Why we Cannot use this keyword in Static Block?

Can we use this keyword in static method? The answer is no because static method does not need any object to be called, and this keyword always point to a current object of a class. simply if there is no object then how the keyword point to any current object so,we cannot use this keyword here.

Why we Cannot override static method?

No, we cannot override static methods because method overriding is based on dynamic binding at runtime and the static methods are bonded using static binding at compile time. So, we cannot override static methods. The calling of method depends upon the type of object that calls the static method.

Can static methods be overridden and why why not?

In short, a static method can be overloaded, but can not be overridden in Java. If you declare, another static method with same signature in derived class than the static method of superclass will be hidden, and any call to that static method in subclass will go to static method declared in that class itself.

Why main method is static?

Java main() method is always static, so that compiler can call it without the creation of an object or before the creation of an object of the class. In any Java program, the main() method is the starting point from where compiler starts program execution. So, the compiler needs to call the main() method.

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.

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’.

Which method Cannot be overridden?

A method declared final cannot be overridden. A method declared static cannot be overridden but can be re-declared. If a method cannot be inherited, then it cannot be overridden. A subclass within the same package as the instance’s superclass can override any superclass method that is not declared private or final.

What is super () in Java?

Definition and Usage The super keyword refers to superclass (parent) objects. It is used to call superclass methods, and to access the superclass constructor. The most common use of the super keyword is to eliminate the confusion between superclasses and subclasses that have methods with the same name.

Which keyword is used to prevent method overriding?

final keywordMethod overriding can be prevented by using the final keyword with a method. In other words, a final method cannot be overridden.

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 we use super keyword in main method?

1 Answer. Nope, we can’t. Main method is a static method and therefore it belongs to the class, not to the instance of this class (object). Very good explanation has already been given here – calling a super method from a static method .

Can we override final method?

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

Can we use super super in Java?

Directly accessing Grandparent’s member in Java: There is error in line “super. … In Java, a class cannot directly access the grandparent’s members. It is allowed in C++ though. In C++, we can use scope resolution operator (::) to access any ancestor’s member in inheritance hierarchy.

What is String [] args?

String[] args in Java is an array of strings which stores arguments passed by command line while starting a program. All the command line arguments are stored in that array. … for(String str : args) { System.