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if(how==0)
{
GpioExample.state=1;
mf = new MainFrame();
}
}
else
{

int how = JOptionPane.showConfirmDialog(this," 반납하시겠습니까?"," 반납",
JOptionPane.YES_NO_OPTION);
if(how==0)
{
GpioExample.state=2;
mf = new MainFrame();
}
}
}
}

< DataBase.java >
package com.example.user.appclient;
/ / h t t p : / / w w w . t u t o r i a l s p o i n t . c o m / j d b c / j d b c - s a m p l e - c o d e . h t m
//http://www.tutorialspoint.com/jdbc/jdbc-db-connections.htm
import java.sql.*;

public class Database {
// JDBC driver name and database URL
static final String JDBC_DRIVER = "myspl_con.src.mysql.jdbc.Driver";
static final String DB_URL = "jdbc:mysql://raspberrypi/rainism";

// Database credentials
static final String USER = "root";
static final String PASS = "raspberry";
static String phone;
static boolean flag=true;
public static void main(String[] args) {
Connection conn = null;
Statement stmt = null;
try{
//STEP 2: Register JDBC driver
Class.forName("myspl_con.src.com.mysql.jdbc.Driver");

//STEP 3: Open a connection

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