An method essentially executes a number of statements

An Introspective
View into Methods in Java

What is a method?

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A java method is a collection of
statements of code that is grouped together into one method that will perform
an operation when its method name is utilized and invoked in the code. However,
in simple terms, a method is a subprogram or a routine that does something when
called and may or may not return a piece of data. An infamous example of a
method in Java is the System.out.println()
method. When the println() method is called, for example, the
method essentially executes a number of statements in order to print a message
on to the console.

Why are methods desirable?

Efficient programmers usually like to write
their code in a modular approach
which allows for a group of programmers to write modules or pieces of code that
will eventually be accumulated later on to create an entire project. This
allows for a lot of teamwork and efficiency during programming. The utilization
of methods allows for a step into modular programming.

Methods are both time and space savers when
it comes to programming in Java. That is, they allow for the repetition of
pieces of code without retyping the code. Methods can be kept and applied over
and over again in newer programs.

How are methods created?

In general, method declarations have six
components in order. At the beginning of a method declaration, modifiers—such
as public, private, and others have to be defined. Next, the return
type has to be defined; this is basically the data type of the value that the
method will return. After that, the method name has to be defined.
Subsequently, the parameter list in parenthesis followed by an exception list
if need be. And finally, the method body encapsulated between curly braces
which includes the code of the method contained within it.

How would you create
a method that accepts NO DATA and RETURNS NO DATA with a simplified example?

In order to create such method, a
few things need to be kept in mind. Since the method returns no data, the
return type of the method has to be void. As well, since the method accepts no
data, the parameters have to be empty. The rest of the method can be made in
whatever way the programmer wishes. Here is an example of a method with these
specifications:

//THIS METHOD ACCEPTS NO DATA AND
RETURNS NO DATA, IT JUST DOES SOMETHING

public static void uselessMethod(){

//This
method prints a message to the console

System.out.println(“This
method is useless and only prints this useless message to the console”);

}

How would you create a method that
accepts DATA and RETURNS NO DATA with simplified example?

In order to create such method, a
few things need to be kept in mind. Since the method returns no data, the
return type of the method has to be void. As well, since the method accepts
data, the parameters have to have something. The rest of the method can be made
in whatever way the programmer wishes. Here is an example of a method with
these specifications:

//THIS METHOD ACCEPTS 2 NUMBERS BUT
DOESN’T RETURN DATA. IT JUST DOES SOMETHING.

public static void add(int numberOne,
int numberTwo){

//This
method prints the sum of the numbers on to the console

System.out.println(“The
sum of these numbers is: ” + (numberOne+numberTwo));

}

 

How would you create
a method that accepts DATA and RETURNS DATA with simplified example?

In order to create such method, a
few things need to be kept in mind. Since the method returns data, the return
type of the method has to be any datatype other than void. As well, since the
method accepts data, the parameters have to have something. The rest of the
method can be made in whatever way the programmer wishes. Here is an example of
a method with these specifications:

//THIS METHOD ACCEPTS 2 NUMBERS AND
RETURNS DATA.

public static int add(int numberOne, int
numberTwo){

//This
method adds the two numbers and it returns the sum

return
numberOne + numberTwo;

}

Explain the mechanism
that Java sends data back to the calling code.

In order to send data back to the
calling code, a method should always have the keyword “return” followed by a
value that is of the same datatype as the method that is being called. When
the method finishes executing, the return keyword sends a value back to the
calling code. The returned value is then usually put into a variable or is used
straight away in the program. A method doesn’t have to return a value if the
method is declared of type void. In that situation, the method doesn’t need to
contain a return statement. If a method is created that returns a value (whether
it be a primitive data type or an object), the method must have a return
statement within the body of the method.

public static int add(int x, int y) {

       
//This method returns and integer type value by using the return keyword

       
return x + y;

}

Explain how to call a
method.

There are two types of methods.
The first is the instance methods. These types of method require an object of a
class to be created in order for it to be used. These methods are not declared
with the static keyword because they are associated with the class that they
are created in. Thus, to call this method, a reference to the object that the
method is a part of has to be made in order to reference the method itself.
Here is an example.

public static void main(Stringargs){

ClassName
object = new ClassName();

//First an
object of the class has to be created

object.exampleMethod();

//Then the
method can be referenced by referencing the object

}//end of main method

The next type of method is a static
method. Static methods use no instance
variables of any object of the class they are defined in. These methods can be
called by using the class name to reference the method instead of referencing
the method using an object. However, if
the method is created in the same class as the main method, then the method can
be called directly without referencing the class name.

public static void main(String args){

ClassName.exampleMethod()//This
method has been called by referencing the

    
                         //class
name of where the method is located

exampleMethod();
// This method is called directly

}

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