- How many default constructors can a class have?
- Why is main method static?
- Can we override main method?
- Why can’t a constructor be final?
- Can we declare constructor as private?
- Can constructor be static in C++?
- Can we inherit constructor?
- Can a constructor be static?
- Is default constructor always called C++?
- Can constructor throw exception?
- Can abstract class have constructor?
- Can we override private method?
- Can constructor be overloaded?
- Can we override static method?
- Can a constructor be final?
- Can we initialize static variable in constructor C++?
- Why can we not override static method?
- Can constructor be static or final?
How many default constructors can a class have?
two constructorsNote that we now have two constructors: a default constructor that will be called in the default case, and a second constructor that takes two parameters.
Also Know, how many constructors are allowed in a class.
You can have 65535 constructors in a class(According to Oracle docs)..
Why is main method static?
Why the main () method in Java is always 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.
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.
Why can’t a constructor be final?
A constructor is never inherited to an another class so it doesn’t need to be marked final. Hey, The constructor cannot be final because the constructor cannot be inherited and in constructor values are initialized to the variable so by this variables changes every time and yes it cannot be inherited.
Can we declare constructor as 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.
Can constructor be static in C++?
The purpose of a constructor is to initialize the contents of an instance of the class. Static methods don’t have an instance associated with them. Hence there is no such thing as a static constructor.
Can we inherit constructor?
Constructors are not members, so they are not inherited by subclasses, but the constructor of the superclass can be invoked from the subclass.
Can a constructor be static?
A static constructor does not take access modifiers or have parameters. A class or struct can only have one static constructor. Static constructors cannot be inherited or overloaded. A static constructor cannot be called directly and is only meant to be called by the common language runtime (CLR).
Is default constructor always called C++?
Whether derived class’s default constructor is called or parameterised is called, base class’s default constructor is always called inside them.
Can constructor throw exception?
Yes, constructors are allowed to throw an exception in Java. A Constructor is a special type of a method that is used to initialize the object and it is used to create an object of a class using the new keyword, where an object is also known as an Instance of a class.
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 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 constructor be overloaded?
Yes! Java supports constructor overloading. In constructor loading, we create multiple constructors with the same name but with different parameters types or with different no of parameters.
Can we override static method?
Can we Override static methods in java? We can declare static methods with the same signature in the subclass, but it is not considered overriding as there won’t be any run-time polymorphism. Hence the answer is ‘No’.
Can a constructor be final?
No, a constructor can’t be made final. A final method cannot be overridden by any subclasses. … In other words, constructors cannot be inherited in Java therefore, there is no need to write final before constructors.
Can we initialize static variable in constructor C++?
As static variables are initialized only once and are shared by all objects of a class, the static variables are never initialized by a constructor. Instead, the static variable should be explicitly initialized outside the class only once using the scope resolution operator (::).
Why can we not override static method?
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).
Can constructor be static or final?
The static , final and abstract keywords are not meaningful for a constructor because: static members belong to a class, but the constructor is needed to create an object. An abstract class is a partially implemented class, which contains abstract methods to be implemented in child class.