done

src/main/java/io/zipcoder/crudapp/Controller/PersonController.java

+package io.zipcoder.crudapp.Controller;
+
+import io.zipcoder.crudapp.Model.Person;
+import io.zipcoder.crudapp.Repository.PersonRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+@RestController
+public class PersonController {
+
+    private final PersonRepository personRepository;
+
+    @Autowired
+    public PersonController(PersonRepository personRepository) {
+        this.personRepository = personRepository;
+    }
+
+    @PostMapping("/person")
+    public ResponseEntity<Person> createPerson(@RequestBody Person p) {
+        return new ResponseEntity<>(this.personRepository.save(p), HttpStatus.CREATED);
+    }
+
+    @GetMapping("/person/{id}")
+    public ResponseEntity<Person> getPerson(@PathVariable int id) {
+        if (this.personRepository.exists(id)) {
+            return new ResponseEntity<>(this.personRepository.findOne(id), HttpStatus.OK);
+        } else {
+            return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+        }
+    }
+
+    @GetMapping("/person")
+    public ResponseEntity<Iterable<Person>> getPersonList() {
+        return new ResponseEntity<>(this.personRepository.findAll(), HttpStatus.OK);
+    }
+
+    @PutMapping("/person/{id}")
+    public ResponseEntity<Person> updatePerson(@PathVariable int id, @RequestBody Person p) {
+        if (!this.personRepository.exists(id)) {
+            return new ResponseEntity<>(this.personRepository.save(p), HttpStatus.CREATED);
+        } else {
+            Person person = this.personRepository.findOne(id);
+            person.setFirstName(p.getFirstName());
+            person.setLastName(p.getLastName());
+            return new ResponseEntity<>(this.personRepository.findOne(id), HttpStatus.OK);
+        }
+    }
+
+    @DeleteMapping("/person/{id}")
+    public void deletePerson(@PathVariable int id) {
+        this.personRepository.delete(id);
+    }
+
+}

src/main/java/io/zipcoder/crudapp/Model/Person.java

+package io.zipcoder.crudapp.Model;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+
+@Entity
+public class Person {
+
+    @Id
+    @GeneratedValue
+    private int id;
+    private String firstName;
+    private String lastName;
+
+    public Person() {}
+
+    public Person(String firstName, String lastName) {
+        this.firstName = firstName;
+        this.lastName = lastName;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+}

src/main/java/io/zipcoder/crudapp/Repository/PersonRepository.java

+package io.zipcoder.crudapp.Repository;
+
+import io.zipcoder.crudapp.Model.Person;
+import org.springframework.data.repository.CrudRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface PersonRepository extends CrudRepository<Person, Integer> {
+}