java判断一个对象是否全部为空

public static boolean isField(Object object)throws Exception{
boolean flag = true;
Class materual = (Class) object.getClass();
Field [] fs = materual.getDeclaredFields();
for (Field f :fs){
f.setAccessible(true);
Object val = f.get(object);
if (val!=null){
flag = false;
break;
}
}
return flag;
}