java比较对象：使用反射？ [英] java compare objects: using reflection?

问题描述

我有一个对象本身有多个对象作为字段。我的问题是，我有两个这样的对象，我想比较这两个。我知道我可以做等于，比较器等，但有一种方法使用反射获得对象的属性，并进行比较。

例如，如果我有一个Car对象，它作为轮对象，它有轮胎对象，它有螺栓对象。请记住所有上述对象是单独的，而不是嵌套的类。如何比较2辆汽车物体？

感谢任何帮助？

感谢

解决方案

  public class Car {
 private Wheels wheels; 
 //其他属性
 
 public boolean equals（Object ob）{
 if（！ 
 Car other =（Car）ob; 
 //比较属性
 if（！wheels.equals（other.wheels））return false; 
 return true; 
} 
} 
  

是正确的方法。不推荐通过反射进行自动比较。对于一个事物，状态是一个比反映属性比较更通用的概念。

你可以写一个深层反射比较的东西， >

I have an object which itself has multiple objects as fields. The question I have is, I have two objects of these kind and I want to compare these two. I know I can do equals, comparator etc. but is there a way to use reflection to get the properties of the object and make comparison.

for example, if I have a Car object, which as wheels object, which has tires object, which has bolts object. Please remember all the above objects are individual and not nested classes. How do I compare 2 car objects?

Any help is appreciated?

Thanks

解决方案

public class Car {
  private Wheels wheels;
  // other properties

  public boolean equals(Object ob) {
    if (!(ob instanceof Car)) return false;
    Car other = (Car)ob;
    // compare properties
    if (!wheels.equals(other.wheels)) return false;
    return true;
  }
}

is the correct approach. Automatic comparison via reflection is not recommended. For one thing "state" is a more generic concept than reflected property comparison.

You could write something that did deep reflection comparison but it's kinda missing the point.

这篇关于java比较对象：使用反射？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！