等于和这些实体的hashCode（Spring MVC + Hibernate）

这些似乎运作良好。我张贴希望有人会发现它有用：

GaraAgenzia类：

public boolean equals(Object o) {        if (this== o) return true;        if (o ==null|| getClass() != o.getClass()) return false;        GaraAgenzia that = (GaraAgenzia) o;        if (getPk() !=null?!getPk().equals(that.getPk()) : that.getPk() !=null) return false;        return true;    }    public int hashCode() {        return (getPk() !=null? getPk().hashCode() : 0);    }

GaraAgenziaId类别：

public boolean equals(Object o) {    if (this== o) return true;    if (o ==null|| getClass() != o.getClass()) return false;    GaraAgenziaId that = (GaraAgenziaId) o;    if (gara !=null?!gara.equals(that.gara) : that.gara !=null) return false;    if (agenzia !=null?!agenzia.equals(that.agenzia) : that.agenzia !=null)        return false;    return true;}public int hashCode() {    int result;    result = (agenzia !=null? agenzia.hashCode() : 0);    result =31* result + (gara !=null? gara.hashCode() : 0);    return result;}