Can we change the signature of main method in Java?

Can we change the signature of main method in Java?

No. You can not do that according to Java Language Specification. But if you want, as Java is a open source project, so download the complete source code of Java language and change it accordingly ( I mean change the source code of JVM itself). This is the only way you can do that.

Can we override the main method in Java?

No, we cannot override main method of java because a static method cannot be overridden.

What is the method signature of the main method of any program in Java?

main(): It is a default signature which is predefined in the JVM. It is called by JVM to execute a program line by line and end the execution after completion of this method. We can also overload the main() method. String args[]: The main() method also accepts some data from the user.

Can a Java program have 2 main methods?

Yes, you can have as many main methods as you like. You can have main methods with different signatures from main(String[]) which is called overloading, and the JVM will ignore those main methods. You can have one public static void main(String[] args) method in each class. Some people use those methods for testing.

Can we declare main method as final?

The short answer is Yes. You can declare main method as final. without any compile error.

Can java main method be int?

Yes, you can but you can’t run that Java class. Q 2: Next question I unable to answer. He asked write a program so that your java main method could return something. You can use System#exit(int) to quit your program with a specific exit code which can be interpreted by the operating system.

Can java main class be extended?

Short answer is YES, we can overload main method in Java. main method’s specialty is that it provides starting point for a standalone java application. main method signature is as follows : public static void main( String[] args );

Is main method compulsory in Java?

Yes, it is required for any executable program. If you try to execute a Java class, the JVM will look for a main method to invoke it. Not all classes need a main , only the one that serve as “entry point” for execution.

How does JVM find main method?

main doesn’t need to be a keyword in java in order for the JVM to look for it at the start of execution. There is no conflict with other methods or variables also called main . This is simply how the JVM spec was designed. It was most likely borrowed from the c language.

Can abstract classes instantiated?

Abstract classes cannot be instantiated, but they can be subclassed. When an abstract class is subclassed, the subclass usually provides implementations for all of the abstract methods in its parent class. However, if it does not, then the subclass must also be declared abstract .

What happens if we declare main method as final in Java?

Yes, we can declare the main () method as final in Java. The compiler does not throw any error. If we declare any method as final by placing the final keyword then that method becomes the final method. The main use of the final method in Java is they are not overridden.

What is the main entry point signature of a Java program?

If it did, let me know by commenting..! public static void main (String a []) is the main entry point signature for a typical Java program. So you should get on with this method signature. Java Runtime tries to find a method with name “main” with argument types “String []”.

What is the use of main() method in JVM?

The main () is the starting point for JVM to start execution of a Java program. Without the main () method, JVM will not execute the program. The syntax of the main () method is: 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.

Can we change method signature in overriding in Java?

Can we change method signature in overriding in Java? No, while overriding a method of the super class we need to make sure that both methods have same name, same parameters and, same return type else they both will be treated as different methods.

What is the difference between void main and main in Java?

void: In Java, every method has the return type. Void keyword acknowledges the compiler that main () method does not return any value. main (): It is a default signature which is predefined in the JVM. It is called by JVM to execute a program line by line and end the execution after completion of this method.