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Why Primary Method Is Populace Static Inwards Java

Main method inwards Java is the kickoff programming method a Java programmer knows when he starts learning Java programming language.have yous e'er thought most why primary method inwards Java is public, static in addition to void, of-course Yes, since most of us kickoff larn C in addition to C++ than nosotros motion to Java inwards our programming path nosotros familiar amongst primary method but inwards Java primary method is slightly dissimilar it doesn't render whatever value similar inwards C it returns int, main method is world static in addition to void Why? In this post nosotros volition endeavour to uncovering answer to these questions in addition to convey an thought of 1 of the most pop questions inwards Java why primary method is declared Static.

What is the primary method inwards Java?

Main method inwards Java is entry quest for whatever centre Java program. Remember nosotros are non talking most Servlet, MIDlet or whatever other container managed Java programme where life cycle methods are provided to command the execution. In centre Java program, execution starts from primary method when yous type coffee main-class-name, JVM search for public static void main(String args[]) method inwards that cast in addition to if it doesn't uncovering that method it throws mistake NoSuchMethodError:main in addition to terminates.

Signature of the primary method inwards Java

The primary method has to strictly follow its syntax; other wise JVM volition non hold upwardly able to locate it in addition to your programme volition non run. Here is the exact signature of the primary method

public static void main(String args[])

This signature is classic signature in addition to at that topographic point from start of Java but amongst introduction of  variable declaration or varargs inwards Java5 you tin likewise declare the primary method inwards Java using varargs syntax every bit shown inwards below example:

public static void main(String... args)

Remember varargs version of coffee primary method volition alone piece of occupation inwards Java 1.5 or afterward version. Apart from public, static in addition to void, at that topographic point are for certain keywords similar final, synchronized in addition to strictfp which are permitted inwards the signature of coffee primary method.

Why primary method is static inwards Java

Now come upwardly to the primary quest "Why the primary method is static inwards Java", at that topographic point are quite a few reasons to a greater extent than or less but hither are few reasons which brand feel to me:

1. Since the primary method is static Java virtual Machine tin telephone telephone it without creating whatever event of a cast which contains the primary method.

2. Since C in addition to C++ likewise convey similar primary method which serves every bit entry quest for programme execution, next that convention volition alone help Java.

3. If primary method were non declared static than JVM has to practise event of primary Class in addition to since constructor tin hold upwardly overloaded in addition to tin convey arguments at that topographic point would non hold upwardly whatever for certain in addition to consistent way for JVM to uncovering primary method inwards Java.

4. Anything which is declared inwards class inwards Java comes nether reference type in addition to requires object to hold upwardly created earlier using them but static method in addition to static information are loaded into split upwardly retentiveness within JVM called context which is created when a cast is loaded. If primary method is static than it volition hold upwardly loaded inwards JVM context in addition to are available to execution.

Why primary method is world inwards Java

Java specifies several access modifiers e.g. private, protected in addition to public. Any method or variable which is declared world inwards Java tin hold upwardly accessible from exterior of that class. Since the primary method is world in

Java, JVM tin easily access in addition to execute it.

Why the primary method is void inwards Java

Since the primary method inwards Java is non supposed to render whatever value, it's made void which merely agency primary is non returning anything.

Summary:

1. The primary method must hold upwardly declared public, static in addition to void inwards Java otherwise, JVM volition non able to run Java program.

2. JVM throws NoSuchMethodException:main if it doesn't uncovering the primary method of predefined signature inwards cast which is provided to Java command. E.g. if yous run coffee Helloworld than JVM volition search for world static void primary String args[]) method inwards HelloWorld.class file.

3. The primary method is an entry quest for whatever Core Java program. Execution starts from the primary method.

4. The primary method is run yesteryear a exceptional thread called "main" thread inwards Java. Your Java programme volition hold upwardly running until your primary thread is running or whatever non-daemon thread spawned from the primary method is running.

5. When yous come across "Exception inwards Thread main” e.g.

Exception inwards Thread main: Java.lang.NullPointerException it agency Exception is thrown within primary thread.

6. You tin declare the primary method using varargs syntax from Java 1.5 onwards e.g.

public static void main(String... args)

7. Apart from static, void in addition to public, yous tin move a final, synchronized in addition to strictfp modifier inwards the signature of the primary method inwards Java.

8. The primary method inwards Java tin hold upwardly overloaded similar whatever other method inwards Java but JVM volition alone telephone telephone the primary method amongst specified signature specified above.

9. You tin move throws clause inwards the signature of the primary method in addition to tin throw whatever checked or unchecked Exception.

10. A static initializer block is executed fifty-fifty earlier JVM calls the primary method. They are executed when a Class is loaded into Memory yesteryear JVM.

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