- Why is main method static?
- Can constructor be private?
- Can we overload and override the main method?
- Can we override static methods?
- Why we Cannot override static method?
- Can we override final method?
- Is Private methods are final in inheritance?
- Is String args necessary in Java?
- Can we override main method in Java with example?
- Can we have 2 main methods in Java?
- How do I override toString method?
- How do you override a method?
- Can we declare constructor as final?
- Can we inherit private method in Java?
- Why method overriding is used?
- Can we override private and final methods?
- Is delete a keyword in Java?
- Can we override public method?
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 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 we overload and override the main method?
Method overloading is one of the ways that java support Polymorphism. Yes, We can overload the main method in java but JVM only calls the original main method, it will never call our overloaded main method.
Can we override static methods?
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’.
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 we override final method?
You use the final keyword in a method declaration to indicate that the method cannot be overridden by subclasses.
Is Private methods are final in inheritance?
When we use final specifier with a method, the method cannot be overridden in any of the inheriting classes. Methods are made final due to design reasons. Since private methods are inaccessible, they are implicitly final in Java. So adding final specifier to a private method doesn’t add any value.
Is String args necessary in Java?
There’s no significant downside in having to include the parameter. The Java runtime system looks specifically for a method with a single String type parameter, because it wants to pass the parameters to your main method. If such a method is not present, it informs you through an exception.
Can we override main method in Java with example?
Short answer is NO,we can not override main method in java. Reason is very simple.As main method is static and we know very well that we can not override static methods in Java,hence main method could not be overridden. … But as we can see in output ,in both calls ,main method of Application class is called.
Can we have 2 main methods in Java?
A class can define multiple methods with the name main. The signature of these methods does not match the signature of the main method. These other methods with different signatures are not considered the “main” method. Yes it is possible to have two main() in the same program.
How do I override toString method?
The toString() method returns the string representation of the object. If you print any object, java compiler internally invokes the toString() method on the object. So overriding the toString() method, returns the desired output, it can be the state of an object etc. depends on your implementation.
How do you override a method?
Rules for method overriding:In java, a method can only be written in Subclass, not in same class.The argument list should be exactly the same as that of the overridden method.The return type should be the same or a subtype of the return type declared in the original overridden method in the super class.More items…•
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.
Can we inherit private method in Java?
You can only call a private member method in its definition class. … say() because derived classes can’t inherit private methods from its base class. Only protected and public methods/variables can be inherited and/or overridden.
Why method overriding is used?
Method overriding, in object-oriented programming, is a language feature that allows a subclass or child class to provide a specific implementation of a method that is already provided by one of its superclasses or parent classes.
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.
Is delete a keyword in Java?
There is no delete in java, and all objects are created on the heap. … Once there are no more references to an object, it becomes available for collection by the garbage collector.
Can we override public method?
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. A subclass in a different package can only override the non-final methods declared public or protected.