part-class

import java.awt.desktop.SystemEventListener;
import java.util.HashSet;
import java.util.Objects;

public class Part {
    private String name;
    private String code;
    private PartType category;
    private HashSet<car> supportedCars;
    private double buyPrice;
    private double sellPrice;
    private Manufacturer manifacturer;

    public Part(String name, double buyPrice, double sellPrice,
                Manufacturer manifacturer,String code,PartType category){
        this.name=name;
        this.buyPrice=buyPrice;
        this.sellPrice=sellPrice;
        this.manifacturer= manifacturer;
        this.code=code;
        this.category=category;
        this.supportedCars=new HashSet<car>();
    }

    public void addSupportedCars(car cars){

        this.supportedCars.add(cars);
    }

public String toString(){
        StringBuilder result= new StringBuilder();
        result.append("Part:" + this.name );
        result.append(System.lineSeparator());

        result.append("-code:" + this.code);
        result.append(System.lineSeparator());

        result.append("-category:" + this.category);
        result.append(System.lineSeparator());

        result.append("-buyPrice:" + this.buyPrice);
        result.append(System.lineSeparator());

        result.append("-sellPrice:" + this.sellPrice);
        result.append(System.lineSeparator());

        result.append("-manifacturer:" + this.manifacturer);
        result.append(System.lineSeparator());

    result.append("--Supported cars--");
        result.append(System.lineSeparator());

        for(car cars:this.supportedCars){
            result.append(cars);
            System.lineSeparator();

        }
        result.append("------------------");
        result.append(System.lineSeparator());
        return result.toString();
    }

@Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Part part = (Part) o;
        return Double.compare(part.buyPrice, buyPrice) == 0 &&
                Double.compare(part.sellPrice, sellPrice) == 0 &&
                name.equals(part.name) &&
                code.equals(part.code) &&
                category.equals(part.category) &&
                supportedCars.equals(part.supportedCars) &&
                manifacturer.equals(part.manifacturer);
    }

    @Override
    public int hashCode() {
        return Objects.hash(name, code, category, supportedCars, buyPrice, sellPrice, manifacturer);
    }


}