This lab will focus on constructors, substrings, and arithmetic operators being used on two different objects: ProperFraction and ImproperFraction

Javadoc can be found here

Start by taking a look at all three files. Although you will not be editing FractionMain.java, it will be useful to read through it and understand how it works. Once you have your other files written, FractionMain.java will allow you to test your files through your IDE's terminal.

The javadoc will have a more detailed explanation for each method. Each method that needs your attention has been marked with a //TODO Student comment and can be found in ProperFraction.java and ImproperFraction.java. Proper fractions are fractions with a whole number as well as a fraction like "1 1/3". Improper fractions will not have a whole number, just a numerator and denominator like "4/3". Some examples of conversions between the two fraction types can be seen in the image below under Helpful Fraction Examples.

Start by writing the constructors in both files and working your way down each file one method at a time. A lot of the methods will be very similar between both fraction files.

Once you have completed the methods, make use of the FractionMain.java file. Run your program and test out different fractions. Do your fractions properly simplify? Do your fractions properly convert between fraction types? Do your fractions follow the instructions in the javadoc of what to do if the denominator is 0? Test it out using FractionMain.java before you turn it in.

If you have reached this step, you have completed each method and verified that they function correctly. Congratulations! Zip all the active files into a zip file and submit them to the assinment on canvas

Just like how we can overload methods by giving them different parameters, we can also overload objects constructors! We can have a variety of different constructors that change when given different parameters. In the example below, we can create a Car object without passing parameters or passing its name and mileage. The respective constructor will be called based on the parameter we give it upon construction.

public class Car { private String name; private int mileage; public Car(){ name = ""; mileage = -1; } public Car(String name, int mileage){ this.name = name; this.mileage = mileage; } public String toString(){ if(name.equals("")) return "Name: Not Specified Mileage: " + mileage; return "Name: " + name + " Mileage: " + mileage; } public static void main(String []args){ Car car1 = new Car(); Car car2 = new Car("X", 1000); System.out.println(car1.toString()); System.out.println(car2.toString()); } }

The Math.floor() function and Math library are an incredibly useful array of methods that assist in math functions, such as Math.PI which is a double with the value of Pi! Math.floor() is a method that takes a double as parameter and removes the decimals, converting it to a whole number.

double dec = 9.546; System.out.println(dec); //Prints "9.546" dec = Math.floor(dec); System.out.println(dec); //Prints "9.0"

The Integer.parseInt() function are useful when converting String objects to int variables.

String number = "1"; System.out.println(number); // Prints "1" int convertedNumber = Integer.parseInt(number); System.out.println(convertedNumber); // Prints 1