Why String array is passed in main method?

Because by passing String arrays , we can pass all the necessary parameters like options/arguments related to the program in the form of String easily. There can be several parameters! Also, all the other datatypes can be easily converted from String!

Why JVM calls main method in Java?

It is called by JVM when we run a class. The JVM does not know how to create an object of a class. It needs a standard way to start the execution of a program. Therefore, the main method is declared as static so that the JVM can call it using the class name which is passed on the command line.

Why is the main () method special in a Java program?

The main method in Java is public so that it’s visible to every other class, even which are not part of its package. if it’s not public JVM classes might not able to access it. 2. The main method is static in Java so that it can be called without creating any instance.

Why are strings immutable in java?

String is Immutable in Java because String objects are cached in String pool. Since cached String literals are shared between multiple clients there is always a risk, where one client’s action would affect all another client. You are right. String in java uses concept of String Pool literal.

When an array is passed to a method?

When we pass an array to a method as an argument, actually the address of the array in the memory is passed (reference). Therefore, any changes to this array in the method will affect the array.

Are string parameters mandatory in main method?

They are mandatory as they make up part of the method signature, without them java does not recognize the method as the entry point. The parameters are read whenever you decide to read / use them, they don’t need to be read unless you need them.

Is strings in Java are mutable?

The Java String is immutable which means it cannot be changed. Whenever we change any string, a new instance is created. For mutable strings, you can use StringBuffer and StringBuilder classes. Let’s first understand what String in Java is and how to create the String object.

Why main method is important in Java program?

In any Java program, the main() method is the starting point from where compiler starts program execution. So, the compiler needs to call the main() method. The main() method in Java must be declared public, static and void. If any of these are missing, the Java program will compile but a runtime error will be thrown.