Why is public used in main method?
public: It is an access specifier. We should use a public keyword before the main() method so that JVM can identify the execution point of the program. If we use private, protected, and default before the main() method, it will not be visible to JVM.
Why main method is declared as public static justify?
Main() is declared as static as it is directly call by the JVM without creating an object of the class in which the it is declared. When java runtime starts,there is no object of class present. Thats why main method has to be static,so JVM can load the class into memory and call the main method.
Why we declare main () method as public and static member?
Java program’s main method has to be declared static because keyword static allows main to be called without creating an object of the class in which the main method is defined. … The public keyword is an access specifier, which allows the programmer to control the visibility of class members.
Why access modifier of main method is public in Java?
Explanation: 1)public: It is an access specifier which allows the JVM(Java Virtual Machine) to access the main method from anywhere. 2)static: static keyword allows the JVM to access the main method without any instance(object). 3)void: It specifies that the main method doesn’t return anything.
Why the main method is static?
The main() method is static so that JVM can invoke it without instantiating the class. This also saves the unnecessary wastage of memory which would have been used by the object declared only for calling the main() method by the JVM.
Can we 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 main method in Java?
No, we cannot override main method of java because a static method cannot be overridden. … So, whenever we try to execute the derived class static method, it will automatically execute the base class static method. Therefore, it is not possible to override the main method in java.
What happens if we don’t use static in main method?
You can write the main method in your program without the static modifier, the program gets compiled without compilation errors. But, at the time of execution JVM does not consider this new method (without static) as the entry point of the program. … If such a method is not found, a run time error is generated.
How does JVM find main method?
A Java virtual machine starts execution by invoking the method main of some specified class, passing it a single argument, which is an array of strings. In the examples in this specification, this first class is typically called Test .
Can we use this () and super () in a constructor?
both this() and super() can not be used together in constructor. this() is used to call default constructor of same class.it should be first statement inside constructor. super() is used to call default constructor of base class.it should be first statement inside constructor.
Can we declare the main method of our class as private?
Yes, we can declare the main method as private in Java. It compiles successfully without any errors but at the runtime, it says that the main method is not public.
Can an interface have main method?
11 Answers. No you cannot, because main has to be static in order to be used as an entry point, and Interfaces dont allow the use of static, until Java 7 . Yes you can run a psvm in an interface, if you’re working in Java 8 . Because static methods are allowed in an interface starting from Java 8.
What if the main method declared as private?
But if you declare main method as private, you would not be able to execute the class as a standalone java program. Any java class that needs to be executed as a standalone file needs to have a main method that is public, static and returns a void.