对这个地方不懂

@Override

public int hashCode() {

final int prime = 31;

int result = 1;

result = prime * result + month;

result = prime * result + ((name == null) ? 0 : name.hashCode());

result = prime * result + ((speices == null) ? 0 : speices.hashCode());

return result;

}

@Override

public boolean equals(Object obj) {

//判断对象是否相等，相等则返回true，不用继续比较属性了 

if (this == obj)

return true;

//判断obj是否为Cat类对象

if (obj.getClass()== Cat.class) {

Cat cat=(Cat)obj;

    return cat.getName().equals(name)&&(cat.getMonth()==month)&&(cat.getSpeices().equals(speices));

}

return false;

}

}