复利计算器6.0

package DataBase;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class SingUpConnect {
private Connection connection;
private Statement statement;
ResultSet resultSet;
private String name;
private String password;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public SingUpConnect() {
connection=ConnectionFactory.getInstane().makeConnection();
}
public void Sin_In() {
ResultSet resultSet=null;
String sql="SELECT * FROM user";
try {
statement=connection.createStatement();
} catch (SQLException e) {

e.printStackTrace();
}
try {
resultSet=statement.executeQuery(sql);
while (resultSet.next()) {
name=resultSet.getString("name");
password=resultSet.getString("password");
}
} catch (SQLException e) {

e.printStackTrace();
}
try {
while (resultSet.next()) {
System.out.println(resultSet.getString("username"));
System.out.println(resultSet.getString("password"));
}
} catch (SQLException e) {

e.printStackTrace();
}
finally{
try {
resultSet.close();
} catch (Exception e2) {

}
try {
statement.close();
} catch (Exception e2) {

}
try {
connection.close();
} catch (Exception e2) {

}
}

}
public void SinUp(String name,String password){
try {
connection.setAutoCommit(false);
UserDao userDao=new UserDaoImpl();
User user=new User();
user.setName(name);
user.setPassword(password);
userDao.save(connection, user);
connection.commit();
} catch (Exception e) {
try {
connection.rollback();
} catch (Exception e2) {
e2.printStackTrace();
}
}
}
}