Copy the program AmusementRide.java to your computer and add your own class that extends class AmusementRide....
Copy the program AmusementRide.java to your computer and add your own class that extends class AmusementRide.
Note: AmusementRide.java contains two classes (class FerrisWheel and class RollerCoaster) that provide examples for the class you must create.
Your class must include the following.
-
Implementations for all of the abstract methods defined in abstract class AmusementRide.
-
At least one static class variable and at least one instance variable that are not defined in abstract class AmusementRide.
-
Override the inherited repair() method following the instructions given in the repair() method comment block.
-
Override the inherited toString() that returns a String representation of your ride objects. The String must contain the String returned from the inherited toString() method.
The main() method in abstract class AmusementRide must keep the class FerrisWheel and class RollerCoaster objects. The main() method must also keep the following behavior:
// pseudo-code...
obj.load()
if (obj.start())
obj.stop()
obj.repair()
However, you must change the main() method to use polymorphism. [hint: array]
The first six lines of the program's output must match the following.
Ferris wheel "The Billy Preston" has capacity of 50 and costs $6.28 ...height: 100; # of spins: 0 mechanics are on strike Roller coaster "for(;;) Young" has capacity of 32 and costs $3.14 ...maxSpeed: 99; trackLength: 25; whiplashFactor: 1.618 mechanics are on strike
Example Output
CSC205 student Edith Foogooman created class BumperCar and she named her ride "Self-driving Bumpers". The output of her program looked as follows.
Ferris wheel "The Billy Preston" has capacity of 50 and costs $6.28 ...height: 100; # of spins: 0 mechanics are on strike Roller coaster "for(;;) Young" has capacity of 32 and costs $3.14 ...maxSpeed: 99; trackLength: 25; whiplashFactor: 1.618 mechanics are on strike Bumper cars "Self-driving Bumpers" has capacity of 17 and costs $6.28 ...weight: 13; speed: 8; os: Linux Self-driving Bumpers has been loaded Self-driving Bumpers has started Self-driving Bumpers has stopped Self-driving Bumpers has been repaired
////////////////////////////////////////////////////
AmusementRide.java:
import java.util.*;
/*
* AmusementRide is a generalization of ride objects
* found at amusement parks.
*
* Note: The non-public fields for this class are
* defined at the bottom of the class.
*
* @creator gdt
* @created 02018.01.02
* @updated 02019.02.01 morphed for spring 2019 semester
*/
public abstract class AmusementRide extends Object {
public final static String DFLT_NAME = "Ride With No Name";
public final static double DFLT_PRICE = 0.0;
public final static int DFLT_CAPACITY = 0;
/**
* Construct an AmusementRide object.
*
* @param n the name of the AmusementRide
* @param p the price of the AmusementRide
* @param c the capacity of the AmusementRide
*/
public AmusementRide(String n, double p, int c) {
name = (n == null) ? DFLT_NAME : n;
price = (p < 0) ? DFLT_PRICE : p;
capacity = (c < 0) ? DFLT_CAPACITY : c;
}
/**
* Print a message indicating this ride has started.
* The message must include the ride's name.
*
* @return true
*/
public abstract boolean start();
/**
* Print a message indicating this ride has stopped.
* The message must include the ride's name.
*/
public abstract void stop();
/**
* Print a message indicating this ride has been loaded.
* The message must include the ride's name.
*
* @return this ride's capacity
*/
public abstract int load();
/**
* Print a message indicating this ride as been repaired.
* The message must include the ride's name.
*/
public void repair() {
System.out.println("mechanics are on strike");
}
/**
* Set the capacity of this AmusementRide.
*
* @param maxload maximum number of riders allowed
* @return this AmusementRide
*/
public AmusementRide setCapacity(int maxload) {
capacity = (maxload < 0) ? DFLT_CAPACITY : maxload;
return this;
}
/**
* Set the price of this AmusementRide.
*
* @param price is USD
*/
public AmusementRide setPrice(double p) {
price = (p < 0) ? DFLT_PRICE : p;
return this;
}
/**
* construct a String representation of this ride...
*
* @return a String representation of this AmusementRide
*/
public String toString() {
return "\"" + name + "\" has capacity of " + capacity +
" and costs $" + price;
}
/**
* main() method used has a driver program to test
* the methods defined in this class...
*/
public static void main(String[] argv) {
FerrisWheel f = new FerrisWheel("The Billy Preston", 50, 6.28, 100);
RollerCoaster r = new RollerCoaster("for(;;) Young", 32, 3.14,
25, 99, 1.618);
System.out.println(f);
f.load();
if (f.start())
f.stop();
f.repair();
System.out.println(r);
r.load();
if (r.start())
r.stop();
r.repair();
}
/*
* The windSpeed is the same for all AmusementRide objects;
* therefore, class variable used instead of an instance variable.
*/
private static int windSpeed;
/*
* The instance data for an AmusementRide.
*/
protected int capacity;
protected String name;
private double price;
private Date lastRepair = new Date();
}
class FerrisWheel extends AmusementRide {
/**
* initialize this object using client supplied data...
*/
public FerrisWheel(String name, int capacity, double price, int height) {
super(name, price, capacity);
if (height <= 0)
throw new IllegalArgumentException("invalid height");
this.height = height;
}
/**
* Return a string representation of this object including
* the state of the AmusementRide part of the object.
*/
public String toString() {
return "Ferris wheel " + super.toString() + "\n" +
"...height: " + height + "; # of spins: " + nSpins;
}
/**
* Spin this ferris wheel once.
*/
public void spin() { nSpins++; }
public boolean start() { return true; }
public void stop() { return; }
public int load() { return capacity; }
/*
* default state values...
*/
private final static int DFLT_MAX_SPINS = 100;
private final static int DFLT_HEIGHT = -1;
/*
* instance variables...
*/
private int nSpins = 0;
private int height = DFLT_HEIGHT; //in feet
}
class RollerCoaster extends AmusementRide {
/**
*/
public RollerCoaster(String name, int capacity, double price,
int len, int speed, double factor) {
super(name, price, capacity);
init(len, speed, factor);
}
private void init(int len, int speed, double factor) {
if (len < 0)
throw new IllegalArgumentException("invalid length");
trackLength = len;
if (!setMaxSpeed(speed))
throw new IllegalArgumentException("invalid speed");
if (factor < 0)
throw new IllegalArgumentException("invalid factor");
whiplashFactor = factor;
}
/**
* maxSpeed is not changed if parameter speed is negative
*
* @param speed new speed
* @return true if speed changed; false otherwise
*/
public boolean setMaxSpeed(int speed) {
if (speed < 0)
return false;
maxSpeed = speed;
return true;
}
/**
* Return a string representation of this object including
* the state of the AmusementRide part of the object.
*/
public String toString() {
final String SEP = "; ";
return "Roller coaster " + super.toString() + "\n" +
"...maxSpeed: " + maxSpeed +
"; trackLength: " + trackLength +
"; whiplashFactor: " + whiplashFactor;
}
public boolean start() { return true; }
public void stop() { return; }
public int load() { return capacity; }
/*
* default state values...
*/
private final static int DFLT_TRACK_LENGTH = -1;
private final static int DFLT_MAX_SPEED = 0;
private final static double DFLT_WHIPLASH_FACTOR = 0.0;
/*
* instance variables...
*/
private int trackLength = DFLT_TRACK_LENGTH; //in feet
private int maxSpeed = DFLT_MAX_SPEED; //in knots
private double whiplashFactor = DFLT_WHIPLASH_FACTOR; //gforces
}Homework Answers
CODE :
import java.util.*;
public abstract class AmusementRide extends Object {
public final static String DFLT_NAME = "Ride With No Name";
public final static double DFLT_PRICE = 0.0;
public final static int DFLT_CAPACITY = 0;
/**
* Construct an AmusementRide object.
*
* @param n
* the name of the AmusementRide
* @param p
* the price of the AmusementRide
* @param c
* the capacity of the AmusementRide
*/
public AmusementRide(String n, double p, int c) {
name = (n == null) ? DFLT_NAME : n;
price = (p < 0) ? DFLT_PRICE : p;
capacity = (c < 0) ? DFLT_CAPACITY : c;
}
/**
* Print a message indicating this ride has started.
*
* @return true
*/
public abstract boolean start();
/**
* Print a message indicating this ride has stopped.
*
* @return true
*/
public abstract boolean stop();
/**
* Print a message indicating this ride has been loaded.
*
* @return this ride's capacity
*/
public abstract int load();
/**
* Print a message indicating this ride as been repaired.
*/
public void repair() {
System.out.println("mechanics are on strike");
}
/**
* Set the capacity of this AmusementRide.
*
* @param maxload
* maximum number of riders allowed
* @return this AmusementRide
*/
public AmusementRide setCapacity(int maxload) {
capacity = (maxload < 0) ? DFLT_CAPACITY : maxload;
return this;
}
/**
* Set the price of this AmusementRide.
*
* @param price
* is USD
*/
public AmusementRide setPrice(double p) {
price = (p < 0) ? DFLT_PRICE : p;
return this;
}
/**
* construct a String representation of this ride...
*
* @return a String representation of this AmusementRide
*/
public String toString() {
return "\"" + name + "\" has capacity of " + capacity + " and costs $" + price;
}
/**
* main() method used has a driver program to test the methods defined in this
* class...
*/
public static void main(String[] argv) {
FerrisWheel f = new FerrisWheel("The Billy Preston", 50, 6.28, 100);
RollerCoaster r = new RollerCoaster("for(;;) Young", 32, 3.14, 25, 99, 1.618);
MyClass m = new MyClass("My ride", 66, 9);
/*System.out.println(f);
f.load();
if (f.start())
f.stop();
else
f.repair();
System.out.println(r);
r.load();
if (r.start())
r.stop();
else
r.repair();
System.out.println(m);
m.load();
if (m.start())
m.stop();
else
m.repair();*/
AmusementRide[] rideArray = new AmusementRide[3];
rideArray[0] = new FerrisWheel("The Billy Preston", 50, 6.28, 100);
rideArray[1] = new RollerCoaster("for(;;) Young", 32, 3.14, 25, 99, 1.618);
rideArray[2] = new MyClass("My ride", 66, 9);
for(int i=0;i<rideArray.length;i++)
{
System.out.println(rideArray[i]);
rideArray[i].load();
if (rideArray[i].start())
rideArray[i].stop();
else
rideArray[i].repair();
}
}
/*
* The windSpeed is the same for all AmusementRide objects; therefore, class
* variable used instead of an instance variable.
*/
private static int windSpeed;
/*
* The instance data for an AmusementRide.
*/
private double price;
protected int capacity;
private String name;
private Date lastRepair = new Date();
}
class FerrisWheel extends AmusementRide {
/**
* initialize this object using client supplied data...
*/
public FerrisWheel(String name, int capacity, double price, int height) {
super(name, price, capacity);
if (height <= 0)
throw new IllegalArgumentException("invalid height");
this.height = height;
}
/**
* Return a string representation of this object including the state of the
* AmusementRide part of the object.
*/
public String toString() {
return "Ferris wheel " + super.toString() + "\n" + "...height: " + height + "; # of spins: " + nSpins;
}
/**
* Spin this ferris wheel once.
*/
public void spin() {
nSpins++;
}
public boolean start() {
return true;
}
public boolean stop() {
return true;
}
public int load() {
return capacity;
}
/*
* default state values...
*/
private final static int DFLT_MAX_SPINS = 100;
private final static int DFLT_HEIGHT = -1;
/*
* instance variables...
*/
private int nSpins = 0;
private int height = DFLT_HEIGHT; // in feet
}
class RollerCoaster extends AmusementRide {
/**
*/
public RollerCoaster(String name, int capacity, double price, int len, int speed, double factor) {
super(name, price, capacity);
init(len, speed, factor);
}
private void init(int len, int speed, double factor) {
if (len < 0)
throw new IllegalArgumentException("invalid length");
trackLength = len;
if (!setMaxSpeed(speed))
throw new IllegalArgumentException("invalid speed");
if (factor < 0)
throw new IllegalArgumentException("invalid factor");
whiplashFactor = factor;
}
/**
* maxSpeed is not changed if parameter speed is negative
*
* @param speed
* new speed
* @return true if speed changed; false otherwise
*/
public boolean setMaxSpeed(int speed) {
if (speed < 0)
return false;
maxSpeed = speed;
return true;
}
/**
* Return a string representation of this object including the state of the
* AmusementRide part of the object.
*/
public String toString() {
final String SEP = "; ";
return "Roller coaster " + super.toString() + "\n" + "...maxSpeed: " + maxSpeed + "; trackLength: "
+ trackLength + "; whiplashFactor: " + whiplashFactor;
}
public boolean start() {
return true;
}
public boolean stop() {
return true;
}
public int load() {
return capacity;
}
/*
* default state values...
*/
private final static int DFLT_TRACK_LENGTH = -1;
private final static int DFLT_MAX_SPEED = 0;
private final static double DFLT_WHIPLASH_FACTOR = 0.0;
/*
* instance variables...
*/
private int trackLength = DFLT_TRACK_LENGTH; // in feet
private int maxSpeed = DFLT_MAX_SPEED; // in knots
private double whiplashFactor = DFLT_WHIPLASH_FACTOR; // gforces
}
//Created class myclass
class MyClass extends AmusementRide{
public MyClass(String name, double price, int capacity) {
super(name, price, capacity);
// TODO Auto-generated constructor stub
}
@Override
public boolean start() {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean stop() {
// TODO Auto-generated method stub
return false;
}
@Override
public int load() {
// TODO Auto-generated method stub
return 0;
}
/**
* Return a string representation of this object including the state of the
* AmusementRide part of the object.
*/
public String toString() {
return "MyClass " + super.toString() + "\n" + "maxTurn: " + maxTurn ;
}
//one static variable
private static int DFLT_MAX_TURN=0;
//one instace variable
private int maxTurn = DFLT_MAX_TURN;
}
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