Following the steps and Using Java OO language to create java classes and subcla

Question

Following the steps and Using Java OO language to create java classes and subclasses. Each concrete class need to have a toString() method to define that prints out its attributes.

The attributes must be private! Error checking is necessary.

Step 1:Define an interface Contact 1. That has the following methods (notice that some are for type String, this means you'll have to convert them to int's) 1. getLength/setLength (int) 2. getSpeed/setSpeed (int) 3. setSpeed(String) 4. getName/setName (String) 5. getType/setType (String) (This is an arbitrary string label for anything of class Contact) Step 2: Define an abstract class Ship that implements the Contact Interface. The methods in contact should be defined (no longer abstract, but they can be overriden later on). Step 3: Define a class Destroyer that subclasses Ship 1. that has the following attributes and get/set methods. Supports int and String setNumberMissiles() arguments. If the String argument of setNumberMissiles(0 encounters a parsing error, set the numberMissiles to 2. 1. numberMissile

Explanation / Answer

Solution:

Please find below all the required classes along with the test class

Contact.java

public interface Contact {

int getLength();
void setLength(int len);
int getSpeed();
void setSpeed(int sp);
void setSpeed(String sp);
String getType();
void setType(String ty);
}

Ship.java

public abstract class Ship implements Contact {

private int lenght;
private int speed;
  
public Ship(int lenght, int speed) {
this.lenght = lenght;
this.speed = speed;
}

public int getLength() {
return this.lenght;
}

public void setLength(int len) {
this.lenght = len;
}

public int getSpeed() {
return this.speed;
}

public void setSpeed(int sp) {
this.speed = sp;
}

public void setSpeed(String sp) {
this.speed = Integer.parseInt(sp);
}

public String getType() {
return this.getClass().toString();
}

public void setType(String ty) {
//Please clarify what to set
//The above getClass will suffice the requirement

}

}

Destroyer.java

public class Destroyer extends Ship {

private int numberOfMissiles;

public Destroyer(int numberOfMissiles, int lenght, int speed) {
super(lenght, speed);
this.numberOfMissiles = numberOfMissiles;
}

public int getNumberOfMissiles() {
return this.numberOfMissiles;
}

public void setNumberOfMissile(int missiles) {
this.numberOfMissiles = missiles;
}

public void setNumberOfMissiles(String missiles) {
try{
this.numberOfMissiles = Integer.parseInt(missiles);
}catch(NumberFormatException e){
this.numberOfMissiles = 2;
}
}

@Override
public String toString() {
return "Destroyer [numberOfMissiles=" + numberOfMissiles + ", lenght=" + super.getLength() + ", speed="
+ super.getSpeed() + "]";
}

  
}

Submarine.java

public class Submarine extends Ship {

private int numberOfTorpedos;

public Submarine(int lenght, int speed, int numberOfTorpedos) {
super(lenght, speed);
this.numberOfTorpedos = numberOfTorpedos;
}

public int geNumberOfTorpedos() {
return this.numberOfTorpedos;
}

public void setNumberOfTorpedos(int torpedos) {
this.numberOfTorpedos = torpedos;
}

public void setNumberOfTorpedos(String torpedos) {
try{
this.numberOfTorpedos = Integer.parseInt(torpedos);
}catch(NumberFormatException e){
this.numberOfTorpedos = 2;
}
}

@Override
public String toString() {
return "Submarine [numberOfTorpedos=" + numberOfTorpedos + ", lenght=" + super.getLength() + ", speed="
+ super.getLength() + "]";
}

}

Aircraft.java

public abstract class Aircraft implements Contact {

private int altitude;

public Aircraft(int altitude) {
this.altitude = altitude;
}

public int getAltitude() {
return this.altitude;
}

public void setAltitude(int alt) {
this.altitude = alt;
}
}

P3.java

public class P3 extends Aircraft {

private int numberEngines;
private int lenght;
private int speed;

public P3(int altitude, int lenght, int speed, int numberEngines) {
super(altitude);
this.lenght = lenght;
this.speed = speed;
this.numberEngines = numberEngines;
}
public int getNumberEngines() {
return this.numberEngines;
}

public void setNumberEngines(int no) {
this.numberEngines = no;
}
  
@Override
public int getLength() {
return this.lenght;
}

@Override
public void setLength(int len) {
this.lenght = len;
}

@Override
public int getSpeed() {
return this.speed;
}

@Override
public void setSpeed(int sp) {
this.speed = sp;
}

@Override
public void setSpeed(String sp) {
this.speed = Integer.parseInt(sp);
}

@Override
public String getType() {
return this.getClass().toString();
}

@Override
public void setType(String ty) {
//Please clarify what to set
//The above getClass will suffice the requirement
}

@Override
public String toString() {
return "P3 [numberEngines=" + numberEngines + ", lenght=" + lenght + ", speed=" + speed + "]";
}

  
}

TestClass.java

import java.util.ArrayList;
import java.util.List;

public class TestClass {

public static void main(String[] args) {
//2 Destroyers
Destroyer destroyer1 = new Destroyer(10, 1000, 100);
Destroyer destroyer2 = new Destroyer(0,0,0);
List<Destroyer> collectionOfDestroyers = new ArrayList<Destroyer>();
collectionOfDestroyers.add(destroyer1);
collectionOfDestroyers.add(destroyer2);

//2 Submarines
Submarine submarine1 = new Submarine(20, 2000, 200);
Submarine submarine2 = new Submarine(0, 0, 0);
List<Submarine> collectionOfSubmarine = new ArrayList<Submarine>();
collectionOfSubmarine.add(submarine1);
collectionOfSubmarine.add(submarine2);

List<Ship> collectionOfShips = new ArrayList<Ship>();
collectionOfShips.add(submarine1);
collectionOfShips.add(submarine2);
collectionOfShips.add(destroyer1);
collectionOfShips.add(destroyer2);

//2 P3s
P3 p3Obj1 = new P3(30, 3000, 300, 3);
P3 p3Obj2 = new P3(0, 0, 0, 2);

List<Contact> collectionOfContacts = new ArrayList<Contact>();
collectionOfContacts.add(destroyer1);
collectionOfContacts.add(destroyer2);
collectionOfContacts.add(submarine1);
collectionOfContacts.add(submarine2);
collectionOfContacts.add(p3Obj1);
collectionOfContacts.add(p3Obj2);
  
//Printing collections
  
collectionOfDestroyers.forEach(destroyer -> System.out.println(destroyer));System.out.println();
collectionOfSubmarine.forEach(submarine -> System.out.println(submarine));System.out.println();
collectionOfShips.forEach(ship -> System.out.println(ship));System.out.println();
collectionOfContacts.forEach(contact -> System.out.println(contact));System.out.println();
}

}

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