AnswersDrive4th December 2019
youth4work
10
What is the meaning of public static void main String args in Java?
public - it is access specifier means from every where we can access it. static - access modifier means we can call this method directly using class name without creating an object of it. void - its the return type. main - method name. string [] args - in java accept only string type of argument and stores it in a
Keeping this in view, what is the meaning of args in Java?
String [] arguments is a java array of String objects. This means that the main function expects an array of Strings. This array of strings typically holds all command line parameter arguments passed in when the program is run from the command line.
What is the use of String args in C#?
vote 74. From the C# programming guide on MSDN: The parameter of the Main method is a String array that represents the command-line arguments. So, if I had a program (MyApp.exe) like this: class Program { static void Main(string[] args) { foreach (var arg in args) { Console.
1
Can you override the main method in Java?
We can not override the static method because static metod is a class method and the scope of this method within the same class itself. Hence, it does not makes sense to "override" it (or for that matter any static method). The concept of "overriding" is only for instance methods.
2
Why do we use static methods in Java?
The static keyword is used in java mainly for memory management. It is used with variables, methods, blocks and nested class. It is a keyword that are used for share the same variable or method of a given class. This is used for a constant variable or a method that is the same for every instance of a class.
3
What is the use of void in Java?
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. void means that the method has no return value. If the method returned an int you would write int instead of void .
4
Why we have to write public static void main in Java?
String is a pre-defined class name in java. The main method must be public so it can be found by the JVM when the class is loaded. Similarly, it must be static so that it can be called after loading the class, without having to create an instance of it. All methods must have a return type, which in this case is void.
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What is the static in Java?
In Java, a static member is a member of a class that isn't associated with an instance of a class. Instead, the member belongs to the class itself. As a result, you can access the static member without first creating a class instance. The value of a static field is the same across all instances of the class.
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How is the main method called in Java?
main is a static method, the entry point for the program, and is called once (unless you explicitly call it), when the program starts, not for each object initialization. The main method is only called in two situations: By the Java Virtual Machine to start the application.
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What do you mean by public static void main String args in Java?
public : it is a access specifier that means it will be accessed by publically. static : it is access modifier that means when the java program is load then it will create the space in memory automatically. void : it is a return type i.e it does not return any value. main() : it is a method or a function name.
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What is the meaning of static in Java?
Answer. The static keyword denotes that a member variable, or method, can be accessed without requiring an instantiation of the class to which it belongs. In simple terms, it means that you can call a method, even if you've never created the object to which it belongs!
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Why do we use string args in Java?
It simply means that you can pass the run-time command line arguments of type String to the main method. In Java args contains the supplied command-line arguments as an array of String objects. In other words, if you run your program as java MyProgram one two then args will contain ["one", "two"] .
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Can we execute a program without main () method?
yes!! we can compile and execute the java program without main method using "static" block. program is: class Demo{ static{ system.out.println("static block "); system. exit(0); }} Without "system.exit(0);" the program will be compiled but gives runtime error!! yes we can run java program without main method .
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Why system out Println is used in Java?
System is a class in the java.lang package . The out is a static member of the System class, and is an instance of PrintStream . The println is a method of PrintStream. This method is overloaded to print message to output destination, which is typically a console or file.
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Why is the main method declared as void?
Without having declared main method static , your program will successfully compile but won't execute and report error at run time. This is necessary since main is called by the Java interpreter before any objects are made. The keyword void simply tells the compiler that main does not return a value.
13
Can we overload the main method in Java?
yes we can overload 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.
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What is the main method in Java?
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 .
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Why main () method is static in Java?
Having the static keyword means the method can be called without creating any objects first. Because otherwise, it would need an instance of the object to be executed. This is neccesary because main() is called by the JVM before any objects are made. Since it is static it can be directly invoked via the class.
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What is the use of constructors in Java?
A constructor in Java is a block of code similar to a method that's called when an instance of an object is created. Here are the key differences between a constructor and a method: A constructor doesn't have a return type. Unlike methods, constructors are not considered members of a class.
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What is main () in Java?
In Java, main is a static method. This means the method is part of its class and not part of objects. Robots are objects. They are defined by classes, which are like factories for the creation of objects.
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What do you mean by command line argument in Java?
Command line argument in Java. The command line argument is the argument passed to a program at the time when you run it. To access the command-line argument inside a java program is quite easy, they are stored as string in String array passed to the args parameter of main() method.
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What is the meaning of public in Java?
public is a Java keyword which declares a member's access as public. Public members are visible to all other classes. This means that any other class can access a public field or method. Further, other classes can modify public fields unless the field is declared as final .
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What is the use of void Main?
Actually, 'main' is the parent function of all the functions in C. If we don't need any return value we use return type 'void'. We can also use ' int' as a return type. After all 'main()' is also a function, there is a flexibility of mentioning return type to it by user.