I was recently asked in an exam if public static void main(String arg[])
format of main
method was fixed?
Can we change it?
Can we use main
without any of public
, static
or void
?
If not, why is it not hard coded that main(String arg[])
would stand for public static void main(String arg[])
always?
public strictfp static void main(String[] args) { }synchronized and final are also valid keywords for the main method but they won't have an effect here.
public static void main(String[] args) Java main method is the entry point of any java program. Its syntax is always public static void main(String[] args) . You can only change the name of String array argument, for example you can change args to myStringArgs .
Yes, we can change the order of public static void main() to static public void main() in Java, the compiler doesn't throw any compile-time or runtime error. In Java, we can declare access modifiers in any order, the method name comes last, the return type comes second to last and then after it's our choice.
public static void main (string args[]) Explanation. In Java, JVM (Java Virtual Machine) will always look for a specific method signature to start running an application, and that would be the public static void main (String args[]).
The signature of the main method is specified in the Java Language Specifications section 12.1.4 and clearly states:
The method main must be declared public, static, and void. It must specify a formal parameter (§8.4.1) whose declared type is array of String.
public
otherwise it would not be possible to call itstatic
since you have no way to instantiate an object before calling itString
arguments is there to allow to pass parameters when executing a Java program from the command line. It would have been possible to define it without arguments but is more practical like that (and similar to other languages)void
since it does not make sense to have anything else: a Java program can terminate before reaching the end of the main method (e.g., by calling System.exit()
)The method signature can therefore be:
public static void main( String[] args )
public static void main( String... args )
note that the varargs version (...
) is only valid from Java 5
As the Java language allows the brackets []
to be positioned after the type or the variable (the first is generally preferred),
public static void main( String args[] ) // valid but usually non recommended
is also valid
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