userdao.java

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package sample.portlet.dao;

import java.util.Collection;

import sample.portlet.domain.User;

public interface UserDao {
	
public User getUserById(Long userId);
	
	public Collection findAll();
	
	public void updateUser(User user);
	
	public void removeUser(User user);
	
	public void saveUser(User user);
	
	public User getUserByUsername(String username);

}