Ingredient.java

package domain;

public class Ingredient {

    private final String name;

    public Ingredient(String name) {
        if (name==null || name.length()==0)
            throw new IllegalArgumentException("Ingredient must be at least one character long");
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public String toString(){
        return name;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        Ingredient that = (Ingredient) o;
        return name.equals(that.name);
    }

    @Override
    public int hashCode() {
        return name.hashCode();
    }
}