Whenever you run a Java program with command prompt or want to give command line arguments, then “String[] args” is used. So basically it takes input from you via command lines. If you don't use command line arguments then it has no purpose to your code. Javac is used for compiling your source code..
Furthermore, what happens if main () method is written without String args?
The main method in Java should have a String[] args as an argument because the language specification compels you to. When you don't give a String[] args in your main method it will not throw any error but you will not be able to run your class. This is because there will be no entry point for your class.
why is the main method static? 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. In this case, main must be declared as public , since it must be called by code outside of its class when the program is started.
Subsequently, question is, why public static void main String args is used?
Main(String[] Args) - main is a method which accept the string array in command prompt . public means You will access anywhere. Static it mainly used for main method because we can call main methodonly one time which is fixed. Void means it doesn't have any return type.
What does string [] args mean?
String[] args in Java is an array of strings which stores arguments passed by command line while starting a program. All the command line arguments are stored in that array. public static void main(String[] args) { for(String str : args) { System.out.println(str);
Related Question Answers
How do you pass arguments in run configuration?
We can also pass command-line arguments to a program in Eclipse using Run Configurations. - Step 1: Open the Class Run Configurations Settings. From the class editor, right click and chose "Run As" -> "Run Configurations".
- Step 2: Specify the Program Arguments in the Arguments Tab.
- Step 3: Click on the Run button.
How do you call a method in main method?
The main() method must be called from a static method only inside the same class. The main() method must be passed the String[] args while calling it from somewhere else. Calling the main() method will lead to an infinite loop as the memory stack knows to run only the main() method.Why we Cannot override static method?
Static methods cannot be overridden because method overriding only occurs in the context of dynamic (i.e. runtime) lookup of methods. Static methods (by their name) are looked up statically (i.e. at compile-time). Method overriding happens in the type of subtype polymorphism that exists in languages like Java and C++.What is argument of main method?
The String[] args parameter is an array of Strings passed as parameters when you are running your application through command line in the OS. The java -jar command will pass your Strings update and notify to your public static void main() method.What is the difference between String [] args and String args []?
Both of them are absolutely the same. Please refer to Java Language Specification (JLS) to see the syntax used in java. String[] args or String args[] will create an array (reserves a place in memory)with no size and name args. The method signature is the same so there is no difference.Can we override Java main method?
Well, you can call it just like any other method. In short, main method can be overloaded but cannot be overridden in Java. That's all about overloading and overriding main method in Java. Now you know that its possible to overload main in Java but its not possible to override it, simply because its a static method.Can we overload main method?
Yes, you can overload main method in Java. you have to call the overloaded main method from the actual main method. Yes, main method can be overloaded. Overloaded main method has to be called from inside the "public static void main(String args[])" as this is the entry point when the class is launched by the JVM. What happens if I remove static from main method?
When java runtime starts, there is no object of the class present. If the main method won't be static, JVM would not be able to call it because there is no object of the class is present. Let's see what happens when we remove static from java main method.What is main in Java?
A Java application is a public Java class with a main() method. The main() method is the entry point into the application. The signature of the method is always: public static void main(String[] args) Command-line arguments are passed through the args parameter, which is an array of String s.Can we have two main methods in a Java class?
You can have one public static void main(String[] args) method in each class. The only way to have two main methods is by having two different classes each with one main method. The name of the class you use to invoke the JVM (e.g. java Class1, java Class2) determines which main method is called.What is return type in Java?
In Java, Return is a keyword which is used to exit from the method only with or without a value. Every method is declared with a return type and it is mandatory for Java methods. Return type may be a primitive type like int, float, double, a reference type, or void type which represents "return nothing".Why main method is static in C#?
A main method is static because it is available to run when your program starts and as it is the entry point of the program it runs without creating an instance of the class.How can you achieve runtime polymorphism in Java?
We can perform polymorphism in java by method overloading and method overriding. Dynamic (run time) polymorphism is the polymorphism existed at run-time. Here, Java compiler does not understand which method is called at compilation time. Only JVM decides which method is called at run-time.What is public static?
public means that the method is visible and can be called from other objects of other types. static means that the method is associated with the class, not a specific instance (object) of that class. This means that you can call a static method without creating an object of the class.What is Polymorphism in Java?
Polymorphism in Java is a concept by which we can perform a single action in different ways. We can perform polymorphism in java by method overloading and method overriding. If you overload a static method in Java, it is the example of compile time polymorphism. Here, we will focus on runtime polymorphism in java.What is argument in Java?
Argument vs Parameter in Java. Argument. An argument is a value passed to a function when the function is called. Whenever any function is called during the execution of the program there are some values passed with the function. These values are called arguments.Can a method return an interface?
Methods do not return interfaces or classes. They return a reference to an instance (=object) or null (or a primitive value, but let's stick with objects). This reference is usually either stored in a variable or used to call instance methods or access instance members.Can we execute a program without main?
Yes You can compile and execute without main method By using static block. But after static block executed (printed) you will get an error saying no main method found. And Latest INFO --> YOU cant Do this with JAVA 7 version. IT will not execute.Can we override the static methods?
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). 
