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The Main method is the method in which execution to any java program begins.
A main method declaration looks as follows:
public static void main(String args[]){
}
The method is public because it be accessible to the JVM to begin execution of the program.
It is Static because it be available for execution without an object instance. you may know that you need an object instance to invoke any method. So you cannot begin execution of a class without its object if the main method was not static.
It returns only a void because, once the main method execution is over, the program terminates. So there can be no data that can be returned by the Main method
The last parameter is String args[]. This is used to signify that the user may opt to enter parameters to the java program at command line. We can use both String[] args or String args[]. The Java compiler would accept both forms.
What else can I help you with?
How do you invoke static methods?
if some method is static, then you can not call that method through the oobject of that class. but the name of the class. let us see a example: class Test { int a; int b; static void show() { System.out.println("we are in show"); } } class Main { public static void main(String args[]) { Test t=new Test(); t.show();\\thiss is an erroraneous code. because, the method "show()" is static. Test.show();\\this is correct } Arnas Sinha
Can we write static public void main in java?
the method of an class that can is triggered when starting a Java application e.g. by running the command: "java MyProgram" Answer Public is an Access Specifier,static is a keyword which illustrates that method shared along all the classes.void illustrates that this method will not have any return type.main is the method which string has an argument. Public specifier makes the method visible outside the Class and because of the static nature of the method, JVM can call this main method without instantiating the class 'MyProgram'.
Does the order of public and static declaration matter in main method?
No
When will you define a method as static in java?
Static keyword when used with a method, specifies that this method belongs to the class and not a particular instance of the class (a.k.a object of the class) Ex: public class StaticTest { public static String getAuthorName() { return "Anand"; } } Here getAuthorName is the static method and it can be accessed without instantiating an object of the class StaticTest. You can access this method as: String authorName = StaticTest.getAuthorName();
Can a main method in java be overloaded?
Yes. The main method is just like any other java method and can be overloaded. But - Only the method with public static void main(String[] args) signature will get invoked when the class is run.
How do you invoke static methods?
if some method is static, then you can not call that method through the oobject of that class. but the name of the class. let us see a example: class Test { int a; int b; static void show() { System.out.println("we are in show"); } } class Main { public static void main(String args[]) { Test t=new Test(); t.show();\\thiss is an erroraneous code. because, the method "show()" is static. Test.show();\\this is correct } Arnas Sinha
Can we write static public void main in java?
the method of an class that can is triggered when starting a Java application e.g. by running the command: "java MyProgram" Answer Public is an Access Specifier,static is a keyword which illustrates that method shared along all the classes.void illustrates that this method will not have any return type.main is the method which string has an argument. Public specifier makes the method visible outside the Class and because of the static nature of the method, JVM can call this main method without instantiating the class 'MyProgram'.
How do you code and call a static method?
class MyClass { // Declare a static method to return the square of a number. public static int getSquare(final int n) { return n*n; } public static void main(String[] args) { // Call the static method to find 1522 System.out.println( MyClass.getSquare(152) ); } }
Why you use main method when you can use static method?
The main method is called by the jvm when your program is executed. The main method is a static method: public static void main(String[] args) {} A static method is method that can be run without instantiate the class (creating an object from it) The main method is a static method. No other static method could replace it's functionality. PS By static method do you mean static initialiser? I often use static initialisers instead of a main method, but in these cases you must still have a main method, albeit an empty one ie. public static void main(String[] args) {} Notice that the method has an empty body A main method must be used if you intend to accept parameters at run time from the jvm.
Does the order of public and static declaration matter in main method?
No
What is the difference between public static void and static void?
The "public" prefix makes the method available from outside the class.The "public" prefix makes the method available from outside the class.The "public" prefix makes the method available from outside the class.The "public" prefix makes the method available from outside the class.
When will you define a method as static in java?
Static keyword when used with a method, specifies that this method belongs to the class and not a particular instance of the class (a.k.a object of the class) Ex: public class StaticTest { public static String getAuthorName() { return "Anand"; } } Here getAuthorName is the static method and it can be accessed without instantiating an object of the class StaticTest. You can access this method as: String authorName = StaticTest.getAuthorName();
Can a main method in java be overloaded?
Yes. The main method is just like any other java method and can be overloaded. But - Only the method with public static void main(String[] args) signature will get invoked when the class is run.
What are the valid signatures of the main method of a class?
The main method can be declared as either of the below: public static void main(String[] args) or public static void main(String args[])
What is static void Main?
The String array args refers to the arguments that the program may require before starting. In many cases you may want the program to take some values as input for processing. this string array is for that purpose.
Can you overwrite main function in java?
You can not overwrite a static method in Java,and 'main' is a static method.so,you can't overwrite the 'main'.
How many types can write public static void main in java?
You can write it in as many ways as you want. The words public, static and void can be interchanged during the method declaration and still the main() method will continue to work in the same way. i.e., public static void main(String[] args) is the same as static public void main(String[] args) However, if you miss either of these 3 keywords from the method signature, the compiler will still let you compile the method, but it just won't be the main method that can be used to start the program execution.
