- Can you use this () and super () both in a constructor?
- Which type of constructor can’t have a return type?
- What happens if a user forgets to define a constructor inside a class?
- Can we override the final method?
- Can we override main method?
- Can constructor be private?
- Can you override static method?
- Can constructor be overloaded?
- Why can’t a constructor be final?
- Why we Cannot override static method?
- Can a constructor be static?
- Can we inherit constructor?
- Can a constructor be declared as final?
- Can constructor have void return type?
- Why constructor is not synchronized in Java?
Can you use this () and super () both in a constructor?
Because if you use this() and super() together in a constructor it will give compile time error.
Because this() and super() must be the first executable statement.
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..
Which type of constructor can’t have a return type?
No, constructor does not have any return type in Java. Constructor looks like method but it is not. It does not have a return type and its name is same as the class name. Mostly it is used to instantiate the instance variables of a class.
What happens if a user forgets to define a constructor inside a class?
Also if any user forgets to define init() function then no object will be initialized whereas if any constructor is not defined in any class the class provides a default constructor for initialization.
Can we override the final method?
You use the final keyword in a method declaration to indicate that the method cannot be overridden by subclasses.
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 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.
Can you 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 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.
Why can’t a constructor be final?
No Constructors can NEVER be declared as final. Your compiler will always give an error of the type “modifier final not allowed” Final, when applied to methods, means that the method cannot be overridden in a subclass. Constructors are NOT ordinary methods. … So there is NO SENSE in declaring it final.
Why we Cannot 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 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).
Can we inherit constructor?
A subclass inherits all the members (fields, methods, and nested classes) from its superclass. 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 declared 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.
Can constructor have void return type?
Note that the constructor name must match the class name, and it cannot have a return type (like void ). Also note that the constructor is called when the object is created. All classes have constructors by default: if you do not create a class constructor yourself, Java creates one for you.
Why constructor is not synchronized in Java?
Note that constructors cannot be synchronized — using the synchronized keyword with a constructor is a syntax error. Synchronizing constructors doesn’t make sense, because only the thread that creates an object should have access to it while it is being constructed.