Question

JAVA question:

Please see the code posted below and improve it so it allows for:

1.new aircraft are entered [new objects]

2.these objects are automatically be assigned their unique IDs [unique ID linked to a static class variable?]

3.will not be automatically given airport codes [initialise airportCode as null in the constructor]

4.assign an airport code to each new aircraft [an object method?]

The code:

class Aeroplane
{
static int planeCount = 0;
static int codeGenerator = 0;
int uniqueID = 0;
String location = "null";

//assuming all the aeroplane entered into the system are flying.
Aeroplane (){
planeCount = planeCount + 1;
uniqueID = planeCount + 1;
}
String assign_code (){
codeGenerator = codeGenerator + 1;
String Aeroplanecode = "A" + codeGenerator;
return Aeroplanecode;
}
}

public class markedEx6{
public static void main (String[]args){
Aeroplane a1 = new Aeroplane ();
Aeroplane a2 = new Aeroplane ();
Aeroplane a3 = new Aeroplane ();

System.out.println (" Aeroplane 1 ID: " + a1.assign_code () +
" and location is: " + a1.location +
"\n Aeroplane 2 ID: " + a2.assign_code () +
" and location is: " + a2.location +
"\n Aeroplane 3 ID: " + a3.assign_code () +
" and location is: " + a3.location);
System.out.println (a1.planeCount);
}
}

Answer 1

code:

class Aeroplane
{
static int planeCount = 0;
static int codeGenerator = 0;
int uniqueID = 0;
String location = "null";

//assuming all the aeroplane entered into the system are flying.
Aeroplane (){
planeCount = planeCount + 1;
uniqueID = planeCount + 1;
}
String assign_code (){
codeGenerator = codeGenerator + 1;
String Aeroplanecode = "A" + codeGenerator;
return Aeroplanecode;
}
}
class newAeroplane{
    static int count=0;
    int uniqueID=0;
    String airportcode;
    newAeroplane(){     //making airportcode null
        airportcode="null";
    }
    public String assignAirportcode(){   //assigning airportcode
        count=count+1;
        uniqueID=count+1;
        airportcode="2"+uniqueID;
        return airportcode;    //return airportcode
    }
}
public class markedEx6{
public static void main (String[]args){
Aeroplane a1 = new Aeroplane ();
Aeroplane a2 = new Aeroplane ();
Aeroplane a3 = new Aeroplane ();
newAeroplane a4=new newAeroplane();
System.out.println (" Aeroplane 1 ID: " + a1.assign_code () +
" and location is: " + a1.location +
"\n Aeroplane 2 ID: " + a2.assign_code () +
" and location is: " + a2.location +
"\n Aeroplane 3 ID: " + a3.assign_code () +
" and location is: " + a3.location);
System.out.println (a1.planeCount);
System.out.println("newAeroplane ID:"+ a4.uniqueID +"and airportcode is:"+a4.assignAirportcode() );
}
}

output: