<Java> Inheritance Usage

public class Jet implements Comparable<Jet> {

protected String manufacturer;

protected String model;

protected int year;

protected String owner;

protected double grossWeightEmpty;

protected int lastOverhaul;

protected int numOverhauls;

protected int maxRecommendedFlightHours;

public Jet(String manufacturer, String model, int year, String owner, double grossWeightEmpty,

int lastOverhaul,int numOverhauls, int maxRecommendedFlightHours){

this.manufacturer=manufacturer;

this.model=model;

this.year=year;

this.owner=owner;

this.grossWeightEmpty=grossWeightEmpty;

this.lastOverhaul=lastOverhaul;

this.numOverhauls=numOverhauls;

this.maxRecommendedFlightHours=maxRecommendedFlightHours;

}

public void sellTo(String owner){

this.owner=owner;

}

public void overhaul(){

lastOverhaul=0;

numOverhauls++;

}

public int timeTillOverhaul(){

return maxRecommendedFlightHours-lastOverhaul;

}

public void fly(int dailyHour){

lastOverhaul+=dailyHour;

}

public boolean needsOverhaul(){

return maxRecommendedFlightHours-lastOverhaul<=100;

}

public boolean isAging(){

return 2020-year>15&&numOverhauls>=20;

}

public int compareTo(Jet o) {

if(this.year<o.year){

return -1;

}

else if(this.year>o.year){

return 1;

}

else{

return 0;

}

}

public String toString (){

return "Manufacturer: "+manufacturer+", Model: "+model+", Year: "+year+", Owner: "+

owner+", Weight in Kg: "+grossWeightEmpty+", Last overhaul: "+lastOverhaul+", Numbers of overhauls: "+

numOverhauls+", Max recommended flight hours: "+maxRecommendedFlightHours;

}

public static void main(String[]args){

Jet j1=new Jet("Boeing","A-747",2018,"Jeemin Myung",1400.7,14,7,250);

Jet j2=new Jet("McDonnell Douglas","F-15K",2000,"Lt.Dan",1224.23,12,21,30);

System.out.println("j1's specification a: "+j1);

j1.sellTo("Professor.Kuhn");

j1.fly(20);

j1.overhaul();

System.out.println("j1's specification b: "+j1);

System.out.println("Jet j1's time till overhaul: "+j1.timeTillOverhaul());

System.out.println("Jet j1 needs overhaul: "+j1.needsOverhaul());

System.out.println("Jet j1 is aging: "+j1.isAging());

System.out.println("\nj2's specification: "+j2);

System.out.println("Jet j2's time till overhaul: "+j2.timeTillOverhaul());

System.out.println("Jet j2 needs overhaul: "+j2.needsOverhaul());

System.out.println("Jet j2 is aging: "+j2.isAging());

if(j1.compareTo(j2)==1){

System.out.println("\nj1 is a better jet because it is newer!");

}

else if(j1.compareTo(j2)==0){

System.out.println("\nIt is nearly impossible to distiguish which jet is better");

}

else{

System.out.println("\nj2 is a better jet because it is newer!");

}

}

}

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public class PassengerJet extends Jet {

private int numPassengers;

private int numEngines;

private boolean hasAutopilot;

public PassengerJet(String manufacturer, String model, int year, String owner, double grossWeightEmpty,

int lastOverhaul,int numOverhauls, int maxRecommendedFlightHours, int numPassengers,int numEngines, boolean hasAutopilot){

super(manufacturer,model,year,owner,grossWeightEmpty,lastOverhaul,numOverhauls,maxRecommendedFlightHours);

this.numPassengers=numPassengers;

this.numEngines=numEngines;

this.hasAutopilot=hasAutopilot;

}

public boolean isHardToFly(){

return !hasAutopilot;

}

public boolean needsLongRunway(){

return grossWeightEmpty>230000;

}

public int compareTo(PassengerJet o) {

if(this.hasAutopilot&&!o.hasAutopilot){

return 1;

}

else if(!this.hasAutopilot&&o.hasAutopilot){

return -1;

}

else{

return 0;

}

}

public String toString() {

return super.toString()+"Number of passengers available: "+numPassengers+", Number of engines: "+numEngines+", Autopilot feature: "+hasAutopilot;

}

public static void main(String[] args) {

PassengerJet pj1=new PassengerJet("Boeing","A-737",2010,"Korea Airline",2100.2,10,12,200,100,4,false);

PassengerJet pj2=new PassengerJet("Airbus","A320",2019,"Airbus airlines",2457.2,12,5,150,200,3,true);

System.out.println("pj1's specification: "+pj1);

System.out.println("The jet is hard to fly: "+pj1.isHardToFly());

System.out.println("The jet needs a long runway"+pj1.needsLongRunway());

System.out.println("\npj2's specification"+pj2);

System.out.println("The jet is hard to fly: "+pj2.isHardToFly());

System.out.println("The jet needs a long runway: "+pj2.needsLongRunway());

if(pj1.compareTo(pj2)==1){

System.out.println("\npj1 is a better passenger jet since it has autopilot");

}

else if(pj1.compareTo(pj2)==0){

System.out.println("\nIt is nearly impossible to distinguish which passenger jet is better");

}

else{

System.out.println("\npj2 is a better passenger jet since it has autopilot");

}

}

}

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public class BusinessJet extends Jet{

private int numPassengers;

private boolean transOceanCertified;

public BusinessJet(String manufacturer, String model, int year, String owner, double grossWeightEmpty,

int lastOverhaul,int numOverhauls, int maxRecommendedFlightHours, int numPassengers, boolean transOceanCertified) {

super(manufacturer,model,year,owner,grossWeightEmpty,lastOverhaul,numOverhauls,maxRecommendedFlightHours);

this.numPassengers=numPassengers;

this.transOceanCertified=transOceanCertified;

}

public boolean isHighClass(){

return numPassengers>=40&&transOceanCertified;

}

public String toString() {

return super.toString()+"Number of passengers available: "+numPassengers+", The aircraft is certified to fly over ocean: "+transOceanCertified;

}

public int compareTo(BusinessJet o) {

if(this.transOceanCertified&&!o.transOceanCertified){

return 1;

}

else if(!this.transOceanCertified&&o.transOceanCertified){

return -1;

}

else{

return 0;

}

}

public static void main(String[] args) {

BusinessJet bj1=new BusinessJet("Boeing","A-737",2010,"Korea Airline",2100.2,10,12,100,40,false);

BusinessJet bj2=new BusinessJet("Airbus","A320",2019,"Airbus airlines",2457.2,12,5,130,50,true);

System.out.println("bj1's specification: "+bj1);

System.out.println("The jet is high class: "+bj1.isHighClass());

System.out.println("\nbj2's specification: "+bj2);

System.out.println("The jet is high class: "+bj2.isHighClass());

if(bj1.compareTo(bj2)==1){

System.out.println("\nbj1 is a better passenger jet since it has capability of more than 40 passengers");

}

else if(bj1.compareTo(bj2)==0){

System.out.println("\nIt is nearly impossible to distinguish which business jet is better");

}

else{

System.out.println("\nbj2 is a better passenger jet since it has capability of more than 40 passengers");

}

}

}