Ulang Spring mvc Service

TamuService.java

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package id.web.rohman.ulangspringservice.service.api;

import id.web.rohman.ulangspringservice.model.Tamu;
import java.util.List;

/**
 *
 * @author syahril
 */
public interface TamuService {
    
    public List<Tamu> listTamu();
    
    public Tamu findTamuById(Integer id);
    
    public void saveTamu(Tamu tamu);
}