functions_Add.java

## functions_Add.java
/*
 * Copyright (c) 2014.
 */

package main.java.com.oopuniversity.basics.functions;

/**
 * Created by OOPUniversity on 11/15/2014.
 */
public class Add {
    public static void main(String[] args) {
        int answer = add ( 2 , 3 );
        System.out.println("The answer is " + answer );
    }

    /**
     * About as basic a function as one can create, Add accepts two 'parameters'
     * and uses them to do a simple calculation.
     *
     * @param number1
     * @param number2
     * @return integer containing the result of adding number1 to number2
     */
    public static int add ( int number1, int number2 ) {
        return number1 + number2;
    }
}

## functions_BadAdd.java
/*
 * Copyright (c) 2014.
 */

package main.java.com.oopuniversity.basics.functions;

/**
 * Created by OOPUniversity on 11/15/2014.
 */
public class BadAdd {
    public static void main(String[] args) {
        int answer = badAdd ( 2 , 3 );
        System.out.println("The answer is " + answer );
    }

    /**
     * A demonstration of how NOT to write a function.  Since this will not
     * always calculate a return value, the compiler won't accept it as valid
     * Java code.
     *
     * @param value1
     * @param value2
     * @return Absolutely nothing, since this fails to even compile as written
     */
    static int badAdd( int value1, int value2 ) {
        if ( value1 < 100 ) {
            return value1 + value2;
        }
        //Fails to compile!
    }

}

## functions_package-info.java
/**
 * Created by OOPUniversity on 11/9/2015.
 */
package main.java.com.oopuniversity.basics.functions;

/**
 *
 * This package outlines some basics of writing valid (and invalid) functions
 * in the Java language.  We have one working and one non-working example, showing
 * how an 'Add' function could be created.
 *
 **/