PIbd-21_KozyrevSS_GasolineTanker_Hard/ComboGenericCollection.java

import javax.swing.*;
import java.awt.*;
import java.util.Random;

public class ComboGenericCollection <T extends BaseTanker, U extends  IWheelDraw> {
    private final T[] _tankers;
    private final U[] _wheels;
    public int MaxSize() {return _tankers.length;}

    private int CountTankers = 0;
    private int CountWheels = 0;
    private final Random random;
    private final int Width;
    private final int Height;

    public ComboGenericCollection(int count, int width, int height)
    {
        _tankers = (T[]) new BaseTanker[count];
        _wheels = (U[]) new IWheelDraw[count];
        random = new Random();
        Width = width;
        Height = height;
    }



    public boolean Add(T tanker)
    {
        for (int i = 0; i < MaxSize(); i++)
        {
            if (_tankers[i] == null)
            {
                _tankers[i] = tanker;
                CountTankers++;
                return true;
            }
        }
        return false;
    }

    public boolean Add(U wheel)
    {
        for (int i = 0; i < MaxSize(); i++)
        {
            if (_wheels[i] == null)
            {
                _wheels[i] = wheel;
                CountWheels++;
                return true;
            }
        }
        return false;
    }




    public DrawTanker CreateDraw()
    {
        T tanker = _tankers[random.nextInt(0, CountTankers)];
        if (tanker instanceof GasolineTanker) {
            return new DrawGasolineTanker((GasolineTanker) tanker, Width, Height, _wheels[random.nextInt(0, CountWheels)]);
        }
        return new DrawTanker(tanker, Width, Height, _wheels[random.nextInt(0, CountWheels)]);
    }
}