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HelloWorld.java
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import graphql.ExecutionResult;
import graphql.GraphQL;
import graphql.schema.GraphQLSchema;
import graphql.schema.StaticDataFetcher;
import graphql.schema.idl.RuntimeWiring;
import graphql.schema.idl.SchemaGenerator;
import graphql.schema.idl.SchemaParser;
import graphql.schema.idl.TypeDefinitionRegistry;
import static graphql.schema.idl.RuntimeWiring.newRuntimeWiring;
public class HelloWorld {
public static void main(String[] args) {
String schema = "type Query{hello: String}";
SchemaParser schemaParser = new SchemaParser();
TypeDefinitionRegistry typeDefinitionRegistry = schemaParser.parse(schema);
RuntimeWiring runtimeWiring = newRuntimeWiring()
.type("Query", builder -> builder.dataFetcher("hello", new StaticDataFetcher("world")))
.build();
SchemaGenerator schemaGenerator = new SchemaGenerator();
GraphQLSchema graphQLSchema = schemaGenerator.makeExecutableSchema(typeDefinitionRegistry, runtimeWiring);
GraphQL build = GraphQL.newGraphQL(graphQLSchema).build();
ExecutionResult executionResult = build.execute("{hello}");
System.out.println(executionResult.getData().toString());
// Prints: {hello=world}
}
}