Why we write public static void main?public is used as an
Access modifiers (or access specifiers) are keywords in object-oriented languages that set the accessibility of classes, methods, and other members. Access modifiers are a specific part of programming language syntax used to facilitate the encapsulation of components.
https://en.wikipedia.org › wiki › Access_modifiers
Why we write public static and void before main method?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. If we omit static keyword before main Java program will successfully compile but it won't execute.
Why we use public static void main String  args?public static void main(String args) public : accessible in whole program/ its scope is in complete program static: there is no need to create object/instance of this main function to access it. void: function can't return value main: this is main function where compiler starts the execution first.
What is public in public static void main?Java :public static void main(String args) The main() method is a special method in Java Programming that serves as the externally exposed entrance point by which a Java program can be run. To compile a Java program, you doesn't really need a main() method in your program.
Why public is used 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 .
4. Why public static void main(String args[ ]) ? JAVA
What is String  args?String args means an array of sequence of characters (Strings) that are passed to the "main" function. This happens when a program is executed. Example when you execute a Java program via the command line: java MyProgram This is just a test. Therefore, the array will store: ["This", "is", "just", "a", "test"]
Why do we write String args in Java?args) is an array of parameters of type String, whereas String is a single parameter. String can full fill the same purpose but just (String… args)provides more readability and easiness to use. It also provides an option that we can pass multiple arrays of String rather than a single one using String.
Can we write static public void main String args?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.
Why is String args compulsory in Java?It's a String because the command line is expressed in text. If you want to convert that text into integers or booleans, you have to do that yourself - how would the operating system or Java bootstrapper know exactly how you wanted everything to be parsed?
Why do we declare main () in Java to be public and static?The main method is public in Java because it has to be invoked by the JVM. So, if main() is not public in Java, the JVM won't call it. That's all about why the main method is declared public and static in Java.
Why do we use static keyword to main method?The static is a keyword which we use in the main() method to define it as static. There is no object of the class available at the time of starting java runtime, and because of that, we have to define the main() method as static. By doing that, JVM can load the class into the main memory and call the main() method.
What is need static before main method?Before the main method is called, no objects are instantiated. Having the static keyword means the method can be called without creating any objects first.
Can we have 2 main methods in Java?From the above program, we can say that Java can have multiple main methods but with the concept of overloading. There should be only one main method with parameter as string[ ] arg.
Can we execute program without main?Yes, we can execute a java program without a main method by using a static block. Static block in Java is a group of statements that gets executed only once when the class is loaded into the memory by Java ClassLoader, It is also known as a static initialization block.
Can we overload main () method?Yes, we can overload the main method in Java, but When we execute the class JVM starts execution with public static void main(String args) method.
What happens if we write static public void main?If you write static public void instead of public static void then it is perfectly OK. Your Java program will compile and run successfully. It doesn't really make any difference as long as method name comes last and return type of method comes second last.
What is the difference between public static and void?public − This is the access specifier that states that the method can be accesses publically. static − Here, the object is not required to access static members. void − This states that the method doesn't return any value.
Can we make constructor static?No, we cannot define a static constructor in Java, If we are trying to define a constructor with the static keyword a compile-time error will occur. In general, static means class level. A constructor will be used to assign initial values for the instance variables.
What is Polymorphism in Java?Polymorphism means "many forms", and it occurs when we have many classes that are related to each other by inheritance. Like we specified in the previous chapter; Inheritance lets us inherit attributes and methods from another class. Polymorphism uses those methods to perform different tasks.
Why is String immutable in Java?The String is immutable in Java because of the security, synchronization and concurrency, caching, and class loading. The reason of making string final is to destroy the immutability and to not allow others to extend it. The String objects are cached in the String pool, and it makes the String immutable.
Can we override main method in Java?Overriding main method
You cannot override static methods and since the public static void main() method is static we cannot override it.
What is the purpose of main method?The purpose of the main method in Java is to be a program execution start point. When you run java.exe , then there are a couple of Java Native Interface (JNI) calls. These calls load the DLL that is really the JVM (that's right – java.exe is NOT the JVM).
What is a String  in Java?A Java string is a sequence of characters that exist as an object of the class java. lang. Java strings are created and manipulated through the string class. Once created, a string is immutable -- its value cannot be changed.
What is main class in Java?The Java Main Class
If only a single Java class in your Java program contains a main() method, then the class containing the main() method is often referred to as the main class. You can have as many classes as you want in your project with a main() method in.
What is thread life cycle in Java?Life Cycle of Thread in Java is basically state transitions of a thread that starts from its birth and ends on its death. When an instance of a thread is created and is executed by calling start() method of Thread class, the thread goes into runnable state.
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