Objects Part 2: Inheritance

(Please write the following classes in java(eclipse). Plesae keep them as simple as possible (like beginnner level) thank you!)

1) modify Sport2 as follows

add the following method and make the class abstract:

public abstract double computeCalories();

implement the Comparable interface, using calories to compare objects:

public int compareTo (Sport2 s)

2) create a TeamSport class that extends Sport and contains the following:

two instances variables

players: number of people on team

time: minutes of play

two constructors

no argument: default values of ice hockey, 544, 6, 60

argument: user-supplied values for activity, calories, players, time

two getters

two setters

toString() that prints values of instance variables

activity hockey

calories 544

players 6

time 60

override the equals() method from Object and have it return true if both TeamSport objects have the same number of players and minutes of play:

public boolean equals (Object o)

override the abstract method from Sport2:

public double computeCalories()

using the following formula:

calories = (minutes played + overtime) * calories / 60 where overtime = random number from 0 to 5 and each overtime is 5 m.

3) create an IndividualSport class that extends Sport2 and contains the following:

instances variable

enjoyability (1 = chore to do, 2 = indifferent, 3 = love)

two constructors

no argument: default value of 1 for enjoyability

argument: user-supplied values for activity, calories, enjoyability

getter

setter

toString() that prints values of instance variables

activity skiing

calories 654

enjoy 1

override the abstract method from Sport:

public double computeCalories()

using the following formula:

calories = minutes played * calories / 60 where time is based on enjoyability (1 = 15 minutes, 2 = half hour, 3 = hour)

Then compile and run SporProgram2.java. Your output should be similar to this

Sport s0 is skating and it burns 392 calories

The calories for s0 is being changed to 572 for a faster rate

Sport s0 now burns 572 calories per hour

Sport s3 is skiing and it burns 654 calories

Doing s0 or s3 will not burn the same number of calories

Sport s7 is sledding and it burns 572 calories

Doing s0 or s7 will burn the same number of calories

There are 8 Sport objects

Here are the properties of the Sport objects:

s0

activity skating

calories 572

enjoyability 1

s1

activity skiing

calories 654

enjoyability 3

s2

activity snowboarding

calories 429

enjoyability 1

s3

activity skiing

calories 654

enjoyability 2

s4

activity ice hockey

calories 544

players 6

time 60

s5

activity curling

calories 327

players 3

time 60

s6

activity ice hockey

calories 544

players 6

time 60

s7

activity sledding

calories 572

enjoyability 2

Does team sport s4 equal s5? no

Does s4 equal s6? yes

s6's time is being changed to 48 minutes

Does s4 equal s6? no

Seeing how sports compare caloriewise:

s1 compared to s4: s1 burns more

s6 compared to s7: s7 burns more

s0 compared to s7: both burn the same

A typical workout session for each sport:

skating 572

skiing 163

snowboarding 429

skiing 327

ice hockey 680

curling 408

ice hockey 661

sledding 286

(numbers may vary due to randomness)

The following is the Sport2 class I already wrote:

public class Sport2 {

private String activity;

private int calories;

public Sport2(){

activity="skating";

calories=392;

}

public Sport2(String act,int cals){

this.activity=act;

this.calories=cals;

}

public String getActivity(){

return activity;

}

public int getCalories(){

return calories;

}

public void setActivity(String act){

activity=act;

}

public void setCalories(int cals){

calories=cals;

}

public String toString(){

return "activty: "+activity+" calories: "+calories;

}

public boolean sameCaloriesExpended(Sport2 acts){

if(this.calories == acts.calories)

return true;

else {

return false;

}

}

static int sportObjects=0;

public static int sportObjects(){

return sportObjects;

}

}

The following is the Sportprogram class:

public class Sportprogram {

public static void main(String[] args) {

// create sport objects

Sport2 s0=new Sport2("skiing",612);

Sport2 s1=new Sport2("curling",272);

Sport2 s2=new Sport2();

Sport2 s3=new Sport2("hockey",544);

Sport2 s4=new Sport2("snowboarding",429);

// use static variable to get number of objects

System.out.println(" There are " + Sport2.sportObjects()

+ " Sport objects");

// print properties of the sport objects

System.out.println(" Here are their properties: ");

Sport2 [] sports = {s0, s1, s2, s3, s4};

for (int i = 0; i < sports.length; i++)

{

System.out.println("s" + i + " " + sports[i] + " ");

}

// use getters and setters

System.out.println("Sport s0 is " + s0.getActivity());

System.out.println("s0 is being changed to downhill skiing");

s0.setActivity("downhill skiing");

System.out.println("Sport s0 is now " + s0.getActivity());

System.out.println(" Doing s0 burns " + s0.getCalories()+ " calories");

System.out.println("s0's calories are being changed to 429 for a "

+ "slower skiing rate");

s0.setCalories(429);

System.out.println("Sport s0 now burns " + s0.getCalories() +

" calories per hour");

// compare calories burned for different sports

System.out.println(" Sport s3 is " + s3.getActivity());

String value = (s0.sameCaloriesExpended(s3)) ? "" : "not ";

System.out.println("Skiing and hockey will " + value

+ "burn the same number of calories");

System.out.println(" Sport s4 is " + s4.getActivity());

value = (s0.sameCaloriesExpended(s4)) ? "" : "not ";

System.out.println("Skiing and snowboarding will " + value

+ "burn the same number of calories ");

}

}