PersonService.java

package io.zipcoder.crudapp;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;

@Service
public class PersonService {

@Autowired
    private PersonRepository repository;

public Person create(Person person){
    return repository.save(person);
}

public Person read(Long id){
    return repository.findOne(id);
}

public Iterable<Person> readAll(){
//    Iterable<Person> personIterable=repository.findAll();
//    List<Person> result=new ArrayList<>();
//    personIterable.forEach(result::add);
//    return result;
    return repository.findAll();
}

public Person update(Long id,Person newData) {
    Person newP = read(id);
    newP.setFirstName(newData.getFirstName());
    newP.setLastName(newData.getLastName());
    repository.save(newP);
    return newP;
    // Person newP=read(id);
    //newData.setLastName(newP.getLastName());
    //repository.save(newData);
}
public Person delete(Person person){
    repository.delete(person);
    return person;
}
    public Person delete(Long id){
        return delete(read(id));

    }
}