Page 1 of 3
Java stand selector LEPA
Posted: Thu Sep 15, 2016 8:29 pm
by oscar6662
Hello peypole I started learning java because programming is the future and I see a better one programmin than making 3d terminals with blender. ( I Wanna be an ATCO in Eurocontrol). So basicly what I made for the moment is a littlet beginner program that you put XXXYYY (XXX=AIRLINE YYY=ATYPE) and it basicly it gives you a random stand of the various stands thas airline can be. My second step is storing all the used stands in an array and then retruning and having a condition that the random factor will randomize but with mor variables.
Version.
Help is appreciated this is not easy at all.
BTW I will post the code when it stops telling me this stupid error thats is not true because in eclipse it works fine.
Re: Java stand selector LEPA
Posted: Fri Sep 16, 2016 6:49 pm
by oscar6662
Code: Select all
package little;
import java.util.Scanner;
public class Program {
public static void main(String[] args) {
// TODO Auto-generated method stub
String youraircraft;
Scanner OK = new Scanner(System.in);
System.out.println("enter the aircraft type pelase");
youraircraft=OK.nextLine();
System.out.println("your slected aircraft is " + youraircraft);
if(youraircraft.equals("BAW320")) {
int m=8;int n=22;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("GECX")){
int m=306;int n=318;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("MON320")){
int m=1;int n=6;int k=104; int f=109;
int r=(int)((Math.random()*(n-m-k-f))+m+f);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("RYRUK738")){
int m=100;int n=103;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("BER320")){
int m=98;int n=60;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("TUI738")){
int m=86;int n=80;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("NLY320")){
int m=50;int n=44;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("VLG320")){
int m=86;int n=98;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("EDW320")){
int m=80;int n=84;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("AEA738")){
int m=98;int n=90;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("BEEX")){
int m=1;int n=12;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("GMI320")){
int m=70;int n=66;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("GMI738")){
int m=70;int n=66;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("CFG320")){
int m=54;int n=50;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("CFG757")){
int m=56;int n=58;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("AFRA320")){
int m=38;int n=40;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("DLH320")){
int m=40;int n=44;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("RYR738")){
int m=158;int n=150;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("ANEX")){
int m=153;int n=150;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("LZB320")){
int m=108;int n=109;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("EWE320")){
int m=68;int n=64;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("LZB320")){
int m=108;int n=109;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("EZY320")){
int m=108;int n=109;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("EZYUK320")){
int m=154;int n=152;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("GWI320")){
int m=80;int n=84;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("IBE320")){
int m=82;int n=86;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else if(youraircraft.equals("KLM738")){
int m=82;int n=86;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
} else{
System.out.println("ashole");
}
}
}...
Copright Oscar Berneguer
Re: Java stand selector LEPA
Posted: Fri Sep 16, 2016 7:13 pm
by oscar6662
LAST modification contains random number but only even (must of stands are only even)
Code: Select all
} else if(youraircraft.equals("TUI738")){
Random rand = new Random();
int randomNum = 16+rand.nextInt(56/16) *2;
System.out.println(randomNum);
Re: Java stand selector LEPA
Posted: Fri Sep 16, 2016 7:19 pm
by jwocky
Try to think about how you can keep aircraft names and stands dynamic
Re: Java stand selector LEPA
Posted: Fri Sep 16, 2016 7:22 pm
by oscar6662
Dynamic, what do you mean?
Re: Java stand selector LEPA
Posted: Fri Sep 16, 2016 7:27 pm
by jwocky
You ask always for a hard coded aircraft like "TUI738"
That is a a 737-800 belonging to TUI
Now, if you split the string you got from the keyboard (look up String.substring()), into two parts, the airline and the aircraft, you can compare in a loop against an array of strings.
Code: Select all
for (int i=0; i<numberofairlines; i++) {
if (airline.equals(airlines[i]) {
... next step would be look up the stands for this airline only ...
}
}
That means, whenever you get a new airline on your airport, you only need to add this airline to a list of airlines, not add another hundred ifs.
Re: Java stand selector LEPA
Posted: Fri Sep 16, 2016 7:43 pm
by oscar6662
yeah then there isnt any way for each arline a specific group of stands, the only advantage is that you can put all the arlines toghtether that have same stands.
Am I wrong?
Re: Java stand selector LEPA
Posted: Fri Sep 16, 2016 7:47 pm
by OPFOR77
Take it a step further and use a multidimensional array, so all the data is stored together and only one loop is needed. So (not a java programmer)
Code: Select all
for (int i=0; i<numberofairlines; i++) {
if (airline.equals(airlines[i][0]) {
int m=airlines[i][1];int n=airlines[i][2];
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
}
}
So all you'd have to do is setup an array like:
array[x][0] = "airline"
array[x][1] = starting_gate
array[x][2] = ending_gate
You could possibly make it even faster using a map/dictionary. Not a java guy, so YMMV.
Re: Java stand selector LEPA
Posted: Fri Sep 16, 2016 7:49 pm
by IAHM-COL
You don't need to nest conditional with else-if statements,
It is actually less computer intensive if you use simpler conditionals; and reserve nested elseifs for those cases that you really need to (as in the first conditional must be false, in order to evaluate a second one)
So, basically, to begin with, (still not most optimized, since you could probably create a function that applies to your class, to manage that amount of returns), again, to begin with, I recommend you go the simple if way, like this:
Code: Select all
package little;
import java.util.Scanner;
public class Program {
public static void main(String[] args) {
// TODO Auto-generated method stub
String youraircraft;
Scanner OK = new Scanner(System.in);
System.out.println("enter the aircraft type please");
youraircraft=OK.nextLine();
System.out.println("your slected aircraft is " + youraircraft);
if(youraircraft.equals("BAW320")) {
int m=8;int n=22;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
}
if(youraircraft.equals("GECX")){
int m=306;int n=318;
int r=(int)((Math.random()*(n-m))+m);
System.out.println("Go to stand " +r);
}
if(youraircraft.equals("MON320")){
int m=1;int n=6;int k=104; int f=109;
int r=(int)((Math.random()*(n-m-k-f))+m+f);
System.out.println("Go to stand " +r);
}
}
}
Re: Java stand selector LEPA
Posted: Fri Sep 16, 2016 7:52 pm
by jwocky
Lets go there step by step
OPFOR is right, you use a multidimensional array later to get all the stands per airline
but before you can do that, bring the 1 dimensional to run with all the airlines, then, when you did that, expand your program the way OPFOR suggested and you have already a pretty flexible solution. But please, for learning purposes, lets go step by step.