PIbd-12_Karamushko_M.K._AirFighter._Hard/AircraftMixer.java

import java.util.Random;

public class AircraftMixer<T extends EntityAircraft, U extends IDrawingEngines> {
    private T[] aircrafts;
    private U[] engines;

    public AircraftMixer(int countAircrafts, int countEngines) {
        aircrafts = (T[])(new EntityAircraft[countAircrafts]);
        engines = (U[])(new IDrawingEngines[countEngines]);
    }

    public int add(T a) {
        int index = 0;
        while(index < aircrafts.length && aircrafts[index] != null) index++;

        if(index == aircrafts.length) return -1;

        aircrafts[index] = a;
        return index;
    }

    public int add(U e) {
        int index = 0;
        while(index < engines.length && engines[index] != null) index++;

        if(index == engines.length) return -1;

        engines[index] = e;
        return index;
    }

    public DrawingAircraft constructAircraft(int width, int height) {
        Random rnd = new Random();

        DrawingAircraft air;

        T selectedAircraft = aircrafts[rnd.nextInt(0, aircrafts.length)];
        U selectedEngines = engines[rnd.nextInt(0, engines.length)];

        DrawingAircraft result;

        if(selectedAircraft instanceof EntityModernAircraft) {
            result = new DrawingModernAircraft(selectedAircraft, selectedEngines);
        }
        else result = new DrawingAircraft(selectedAircraft, selectedEngines);

        result.SetPosition(10, 10, width, height);
        return result;
    }
}