英文:
How to Lombok with equals hashcode and toString with two objects that have a cycle?
问题
我有两个类
@Data
class Org {
int id;
Account orgAccount;
...
}
@Data
class Account {
Org org;
}
我有以下对象
var org = new Org();
org.setId(123);
var account = new Account();
org.setOrgAccount(account);
account.setOrg(org);
如果我执行 account.hashCode() 或 account.toString()，由于循环引用，会导致堆栈溢出。为了解决这个问题，我做了以下操作
@Data
class Account {
@EqualsAndHashCode.Exclude
@ToString.Exclude
Org org;
}
但实际上，我仍然希望对 org 进行比较，但只比较 id 而不是整个对象。在不实现自己的 equals/hashcode 的情况下，有什么最好的方法可以实现这一点？
英文:
I have two classes
@Data
class Org {
int id;
Account orgAccount;
...
}
@Data
class Account {
Org org;
}
And I have a the following objects
var org = new Org();
org.setId(123);
var account = new Account();
org.setOrgAccount(account);
account.setOrg(org);
If I do a account.hashCode() or account.toString() I would get a stack overflow because of the cycle. To get around this I do
@Data
class Account {
@EqualsHashCode.Exclude
@ToString.Exclude
Org org;
}
But I actually still want org to be compared, but only for the id rather than the whole object. What's the best way to do this without implementing your own equals/hashcode?
答案1
得分: 1
我的解决方案是包括一个可以设为`private`的方法，该方法将获取我想要进行比较的值，并将其包括在ToString和EqualsHashCode中。
@Data
class Account {
@EqualsHashCode.Exclude
@ToString.Exclude
Org org;
@EqualsHashCode.Include
@ToString.Include
private int getOrgId() { return org.getId(); }
}
英文:
My solution is to include a method that can be private that will get the value I want to be compared and include it for ToString and EqualsHashCode
@Data
class Account {
@EqualsHashCode.Exclude
@ToString.Exclude
Org org;
@EqualsHashCode.Include
@ToString.Include
private int getOrgId() { return org.getId(); }
}
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