Question

For this Java program I have to be implementing a Pedometer class. The driver file will be provided for you
( PedometerDriver.java ) and can be downloaded in Canvas.
Write a stand alone class.
Name your class Pedometer and source file Pedometer.java .
Program 6
Overview
Goals
Class and File Naming
Here is the Unified Modeling Language (UML) diagram for the Pedometer class. See the end of this
document for information on how to read a UML document.
Pedometer
- steps : int
- strideLength : double
- feetpermile : int
- feetperkm : double
«constructor» Pedometer()
«constructor» Pedometer(s : int)
«constructor» Pedometer(s : int, sl : double)
+ caloriesBurned(weight: double) : double
+ miles() : double
+ kilometers() : double
+ getSteps() : int
+setSteps(theSteps: int) : void
+ reset() : void
+ getStrideLength() : double
+ setStrideLength(slength : double) : void
+ step() : void
+ addSteps(moreSteps : int) : void
Here are brief descriptions of the fields:
Field Description Notes
steps Holds the number of steps should be >= 0
strideLength Length of a stride in feet must be positive
feetpermile Number of feet per mile, which is 5280 should be declared final
feetperkm Number of feet per kilometer, should be set to 3280.84 should be declared final
What to Implement
Here are brief descriptions of all of the methods you should implement. Make sure to name them and
implement them exactly as you see them here as this is how Web-CAT will test them:
Method Description
Pedometer() Default constructor, set steps and strideLength both to 0
Pedometer(s)
Specific constructor, sets steps to parameter s if greater than or equal to
0
Pedometer(s,sl)
Specific constructor, sets steps to parameter s if greater than or equal to
0 , no change otherwise; sets stride length to parameter sl if greater
than 0 , no change otherwise
caloriesBurned(weight)
Takes weight as parameter, calculates and returns number of calories
burned
miles() Returns the amount of miles walked
kilometers() Returns the amount of kilometers walked
getSteps() Returns the number of steps
setSteps(theSteps)
Sets the number of steps for the current object if the parameter is greater
than or equal to 0 , no change otherwise
reset() Resets the number of steps to 0
getStrideLength() Returns the value of strideLength
setStrideLength(slength)
Sets the strideLength for the current object if the parameter is greater
than 0 , no change otherwise
step() Increments the number of steps by 1
addSteps(moreSteps) If parameter is greater than 0 , adds it to steps, no change otherwise
To calculate the number of calories burned for the caloriesBurned() method, use the table below.
Please realize that this is not a scientifically accurate representation of calories burned for walking!
Weight Calories burned per step
≤ 0 lbs 0
> 0 and ≤ 150 lbs 0.05
> 150 and < 200 lbs 0.10
≥ 200 and < 250 lbs 0.17
≥ 250 and < 300 lbs 0.23
≥ 300 and < 350 lbs 0.31
≥ 350 lbs 0.51
The test file has been given to you and you should not change anything in this file. Running this driver file
with your implementation of Pedometer should generate the output found below.
Note: WebCAT will test more than just the following, though.
I have burned 500.0 calories.
You have burned 935.0000000000001 calories.
They have burned 2300.46 calories.
I have walked 6.627532664268131 miles.
You have walked 8.60135361731066 kilometers.
0 steps and stride of 0.0 feet.
0 steps and stride of 0.0 feet.
0 steps and stride of 0.0 feet.
0 steps and stride of 0.0 feet.

The driver file to output it is the following code:

import java.util.Scanner;

public class DrivePedometer
{
public static void main(String [] args)
{
Pedometer mine = new Pedometer();
Pedometer yours = new Pedometer(500);
Pedometer theirs = new Pedometer(10002,5.12);
  
mine.setStrideLength(3.5);
yours.setStrideLength(2.5);
  
for (int i = 0; i < 10000; i++)
mine.step();
  
yours.addSteps(5000);
  
System.out.println("I have burned " + mine.caloriesBurned(150) + " calories.");
System.out.println("You have burned " + yours.caloriesBurned(200) + " calories.");
System.out.println("They have burned " + theirs.caloriesBurned(250) + " calories.");
  
yours.reset();
yours.setSteps(11290);
  
System.out.println("I have walked " + mine.miles() + " miles.");
System.out.println("You have walked " + yours.kilometers() + " kilometers.");
  
Pedometer other = new Pedometer(-5);
System.out.println(other.getSteps() + " steps and stride of " + other.getStrideLength() + " feet.");
other.setStrideLength(0);
System.out.println(other.getSteps() + " steps and stride of " + other.getStrideLength() + " feet.");
other.setSteps(-500);
System.out.println(other.getSteps() + " steps and stride of " + other.getStrideLength() + " feet.");
other.setSteps(0);
System.out.println(other.getSteps() + " steps and stride of " + other.getStrideLength() + " feet.");

}
}

What code do I need for the Pedometer class file to make the driver output like the sample?

Answer 1

public class Pedometer {

    private int steps;
    private double strideLength;
    private final int feetpermile = 5280;
    private final double feetperkm = 3280.84;

    public Pedometer() {
        this.steps = 0;
        this.strideLength = 0;

    }

    public Pedometer(int s) {
        this.steps = s >= 0 ? s : 0;
        this.strideLength = 0;

    }

    public Pedometer(int s, double sl) {
        this.steps = s >= 0 ? s : 0;
        this.strideLength = sl;
    }

    public double caloriesBurned(double weight) {
        if (weight <= 0) {
            return 0;
        } else if (weight <= 150) {
            return 0.05 * steps ;
        } else if (weight < 200) {
            return 0.10 * steps ;
        } else if (weight < 250) {
            return 0.17 * steps ;
        } else if (weight < 300) {
            return 0.23 * steps ;
        } else if (weight < 350) {
            return 0.31 * steps ;
        } else {
            return 0.37 * steps * weight;
        }
    }

    public double miles() {
        return strideLength*steps/feetpermile;
    }

    public double kilometers() {
        return strideLength*steps/feetperkm;
    }

    public int getSteps() {
        return steps;
    }

    public void setSteps(int steps) {
        this.steps = steps>0?steps:this.steps;
    }

    public double getStrideLength() {
        return strideLength;
    }

    public void setStrideLength(double strideLength) {
        this.strideLength = strideLength;
    }

    public void step() {
        this.steps++;
    }

    public void addSteps(int moreSteps) {
        this.steps += moreSteps > 0 ? moreSteps : 0;
    }

    public void reset() {
        steps = 0;
    }


}

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