lombok EqualsAndHashCode
时间: 2023-11-16 16:54:50 浏览: 148
lombok 的 @EqualsAndHashCode 注解可以帮助我们自动生成 equals 和 hashCode 方法,从而简化代码编写。它会根据类中的字段自动生成 equals 和 hashCode 方法,如果不想包含某些字段,可以使用 exclude 属性进行排除。
例如,我们有一个 User 类,包含 id、name 和 age 三个字段,我们可以使用 @EqualsAndHashCode 注解来自动生成 equals 和 hashCode 方法:
```
import lombok.EqualsAndHashCode;
@EqualsAndHashCode
public class User {
private Long id;
private String name;
private Integer age;
}
```
这样就可以自动生成 equals 和 hashCode 方法了。
相关问题
lombok EqualsAndHashCode(callSuper = true) 和父类equals比较不想等
在使用Lombok注解的情况下,如果在子类中使用@EqualsAndHashCode(callSuper = true)注解,则会自动生成equals和hashCode方法,并且会调用父类的equals和hashCode方法进行比较。
如果发现子类的equals方法和父类的equals方法比较结果不一致,可能是因为子类中的属性和父类中的属性不同,导致equals方法比较结果不同。
解决方法可以在子类中重写equals方法,重新定义比较逻辑,或者在父类中使用@EqualsAndHashCode(callSuper = false)注解,禁止调用父类的equals方法进行比较。
lombok.EqualsAndHashCode
lombok.EqualsAndHashCode is a Lombok annotation that generates `equals()` and `hashCode()` methods for a class. This annotation helps to reduce boilerplate code and ensures that the `equals()` and `hashCode()` methods are implemented consistently.
To use the `@EqualsAndHashCode` annotation, you simply need to annotate your class with it. Lombok will then generate the `equals()` and `hashCode()` methods based on the fields of the class.
Here's an example:
```java
import lombok.EqualsAndHashCode;
@EqualsAndHashCode
public class MyClass {
private int id;
private String name;
// other fields and methods
}
```
In this example, Lombok will generate the `equals()` and `hashCode()` methods for the `MyClass` class based on the fields `id` and `name`. You can customize the behavior of these methods by providing additional options to the `@EqualsAndHashCode` annotation.
For example, you can exclude certain fields from the equality check by using the `exclude` parameter:
```java
@EqualsAndHashCode(exclude = "name")
public class MyClass {
// fields and methods
}
```
This will generate the `equals()` and `hashCode()` methods considering all fields except the `name` field.
I hope this helps! Let me know if you have any more questions.
阅读全文