@Canonical annotation

27 / Sep / 2012 by Mohit Garg 2 comments

@Canonical: It’s very useful annotation. It provides the combination of features of @ToString (default implementation of toString() method based upon the fields in the class), @EqualsAndHashCode(default implementation of equals() and hashCode() method of the class based upon the fields in the class) and @TupleConstructor (provides the classical constructor with default properties).

[groovy]
import groovy.transform.Canonical

@Canonical
class Person {
String name
String address
String city

}

Person person = new Person(name:"Mohit Garg",address:"Address",city: "city")
Person person1 = new Person("Mohit Garg","Address","city")

println("Check two objects are equal:::"+(person.equals(person1))) // Both objects will be equal because of same hashCode. (Output:true)

println("person object:::"+person) //Output:Person(Mohit Garg, Address, city)
[/groovy]

Hope this will help you 🙂

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comments (2)

  1. Deepak Mittal

    Hi Jason,

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    Reply
  2. Jason John

    I was a proud subscriber of intelligrape’s Blogs, but now it seems that you people are posting documentation of twitter/linkedin/spring, i have a huge spam on these topics in my feed reader, thanks to you guys.
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    Reply

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