Today class_- RGUMENT,PARAMETERS,METHOD OVERLOADING and Why static used in main method...

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. An argument when passed with a function replaces with those variables which were used during the function definition and the function is then executed with these values.

Parameters:

Parameters are variables defined in the method declaration after the method name, inside the parentheses. This includes primitive types such as int, float, boolean, etc, and non-primitive or object types such as an array, String, etc. You can pass values(Argument) to the method parameters, at the method call. The method call has the same number of arguments and is in the same order, as the parameters.

EXAMPLE:

public class Example {

    public static int multiply(int a, int b)
    {
        return a * b;
    }

    public static void main(String[] args)
    {
        int x = 2;
        int y = 5;

        // the variables x and y are arguments
        int product = multiply(x, y);

        System.out.println("PRODUCT IS: " + product);
    }
}

Reference:https://www.geeksforgeeks.org/argument-vs-parameter-in-java/

Method Overloading in Java:

In Java, Method Overloading allows different methods to have the same name, but different signatures where the signature can differ by the number of input parameters or type of input parameters, or a mixture of both.

When there are multiple functions with the same name but different parameters then these functions are said to be overloaded. Functions can be overloaded by changes in the number of arguments or/and a change in the type of arguments.

Method overloading in Java is also known as Compile-time Polymorphism, Static Polymorphism, or Early binding. In Method overloading compared to the parent argument, the child argument will get the highest priority.

Poly-many
morphing-face-Many face

Reference:https://www.geeksforgeeks.org/method-overloading-in-java/

What is Polymorphism in Java?(TBD)

Polymorphism is considered one of the important features of Object-Oriented Programming. Polymorphism allows us to perform a single action in different ways. In other words, polymorphism allows you to define one interface and have multiple implementations. The word “poly” means many and “morphs” means forms, So it means many forms.

EX- Real-life Illustration of Polymorphism in Java: A person can have different characteristics at the same time. Like a man at the same time is a father, a husband, and an employee. So the same person possesses different behaviors in different situations. This is called polymorphism.

Types of Java Polymorphism

In Java Polymorphism is mainly divided into two types:

1. Compile-time Polymorphism 2.Runtime Polymorphism

Reference:https://www.geeksforgeeks.org/polymorphism-in-java/

Why main() method is always static in Java?

public class Example {

    public static int multiply(int a, int b)
    {
        return a * b;
    }

    public static void main(String[] args)
    {
        int x = 2;
        int y = 5;

        // the variables x and y are arguments
        int product = multiply(x, y);

        System.out.println("PRODUCT IS: " + product);
    }
}

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.

So, if we define main() method as non-static method, JVM would not be able to call it.

Reference:https://www.javatpoint.com/why-main-method-is-always-static-in-java

PROGRAM:

public static void main(String[] args){    } 

OUTPUT:

public class Stutend
{
public static void main(String[] args)
{
Stutend mark1 = new Stutend(); 
Stutend mark2 = new Stutend(); 
Stutend mark3 = new Stutend(); 
mark1.add(85,88);
mark2.sub(95,96);
mark3.add(8.5f,9.5f);

}

public void add(int no1, int no2)
{
System.out.println(no1+no2);
}

public void sub(int n1, int n2)
{
System.out.println(n1-n2);
}
public void add(float n1, float n2)
{
System.out.println(n1+n2);
}

}

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