How do you add methods and variable in a java program?

Answer 1

For example, if I have a program like this:

import java.util.*;

public class Example

{

public static void main(String[] args)

{

System.out.println("Test");

Scanner in = new Scanner(System.in);

System.out.println("Please type a number.");

double d = in.nextDouble();

System.out.println("Please type another number.");

double e = in.nextDouble();

System.out.println("The two numbers multiplied together yields: " + (d*e));

System.out.println("The two numbers added together yields: " + (d+e));

System.out.println("The remainder of the first divided by the second yields: " + (d%e));

}

}

and I want to add a variable to it, anywhere within the main method (in between the inner-most pair of braces in this case, as we don't have any for loops, while loops, if statements, etc) I would type something like:

int q = 47;

which would create a integer-space in memory, name it q, and assign the value of 47 to it. To add methods is a bit more complex.

Methods are written like this:

public static void anotherMethod()

{

//Do something here

}

Now in order to use these, you would call them from your main method. To do so, you would insert code into your main method calling on the new method (method calling). Code for this would look like:

anotherMethod();

The line of code right above would call the method "anotherMethod" inside the same java class.

You would insert this method after the main method ends (so after the final brace of main) but inside the brace for the class. In this code sample, you would insert it before the final brace, like so:

import java.util.*;

public class Example

{

public static void main(String[] args)

{

System.out.println("Test");

Scanner in = new Scanner(System.in);

System.out.println("Please type a number.");

double d = in.nextDouble();

System.out.println("Please type another number.");

double e = in.nextDouble();

System.out.println("The two numbers multiplied together yields: " + (d*e));

System.out.println("The two numbers added together yields: " + (d+e));

System.out.println("The remainder of the first divided by the second yields: " + (d%e));

int q = 47;

anotherMethod();

}

public static void anotherMethod()

{

//Do something here

}

}

As you will see, in the above code I declared int q to be 47 (added that line in) and after the braces that defined the main method, I inserted another method called 'anotherMethod'. I did a method call from the main method with the line of code:

anotherMethod();

If you have any questions about the above explanation feel free to send me a PM on answers.com, or edit this question :)

EDIT: I have made a YouTube video for this question, with a link to it in the related links area.