- Can we have this () and super () together?
- Can we create object for private class?
- Can constructor be static or final?
- What happens if constructor of class A is made private *?
- How can you make a class if the constructor is private?
- Can a constructor be made final?
- Why can’t a constructor be final?
- Is constructor return any value?
- Can a constructor be static?
- What is the purpose of a private constructor?
- Can we override private methods?
Can we have this () and super () together?
If you write this() first than super() will become the second statement and vice-versa.
That’s why we can’t use this() and super() together.
this() and super(), both are the constructors that’s why must be the first statement.
this(): It is used to call, same class Default or Parametrized Constructor..
Can we create object for private class?
yes. private is an access modifier, as you might have learned that restricts member to be access just within declaring scope. So as a member of another class , private class can be accessed in that class only.
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.
What happens if constructor of class A is made 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.
How can you make a class if the constructor is private?
Yes we can have private constructors in a class and yes they can be made accessible by making some static methods which in turn create the new object for the class. So to make an object of this class, the other class has to use the static methods.
Can a constructor be made 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.
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.
Is constructor return any value?
No, constructor does not return any value. While declaring a constructor you will not have anything like return type. In general, Constructor is implicitly called at the time of instantiation.
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).
What is the purpose of a private constructor?
Private constructors are used to prevent creating instances of a class when there are no instance fields or methods, such as the Math class, or when a method is called to obtain an instance of a class. If all the methods in the class are static, consider making the complete class static.
Can we override private methods?
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.