Learn about the common annotations in Graphql Java Annotations framework

Graphql Java Annotions is a framework for using Graphql in Java applications.It allows developers to use annotations to define Graphql's schema and Resolver, and automatically process data query and mutations. 1. `@GraphQLQuery` `@Graphqlquery` Annotation is used to declare a method as Graphql.The annotation method should return a result object that will be used as a response to the query. public class MyQueryResolver { @GraphQLQuery(name = "getUserById") public User getUserById(@GraphQLArgument(name = "id") int id) { // Find the database or other data sources and return the result } } In the above example, we declare a graphql query called `GetuserByid`.This method accepts a `ID` parameter and return a` user` object as the query result. 2. `@GraphQLMutation` `@Graphqlmutation` Annotation is used to declare a method as a graphql mutation.Mutation is the type of Graphql used to modify the data. public class MyMutationResolver { @GraphQLMutation(name = "createUser") public User createUser(@GraphQLArgument(name = "input") UserInput userInput) { // Create a user and return the result } } In the above example, we declare a Graphql variation called `Createuseuser`.This method accepts an `UserInput` object named` Input` as a parameter, and returns a `User` object as the result of mutation. 3. `@GraphQLInputObjectType` `@GraphqlinputObjectType` Annotation is used to declare a class as Graphql input object type.The input object type is used to define the input parameters of the mutant operation. @GraphQLInputObjectType(name = "UserInput") public class UserInput { @GraphQLInputField(name = "name") private String name; // Other attributes and getter/setter methods } In the above example, we define an input object type called `UserInput`.This type has a `name` attribute to indicate the name of the user. 4. `@GraphQLArgument` `@Graphqlarguument` Annotation is used to declare a method parameter of a method parameter as Graphql to query or variate. public class MyQueryResolver { @GraphQLQuery(name = "getUserById") public User getUserById(@GraphQLArgument(name = "id") int id) { // Find the database or other data sources and return the result } } In the above example, we declare the parameter of the `ID` parameter for the query of the` GetuserByid`. The above are examples of some commonly used annotations in Graphql Java Annotations.With these annotations, developers can easily define Graphql's schema and Resolver, and simplify the code writing and configuration process that interacts with Graphql.In practical applications, we need to add corresponding dependencies in the project, and correctly configure the endpoint and data source of Graphql to correctly use Graphql Java Annotations.