try {
//DriverManager.registerDriver(com.mysql.jdbc.Driver);
String DBUrl = String.format("jdbc:mysql://google/%s?cloudSqlInstance=%s&"
+ "socketFactory=com.google.cloud.sql.mysql.SocketFactory",
databaseName,instanceConnectionName);
Connection  DbConn = DriverManager.getConnection(DBUrl,DBUser,DBPwd);
} catch(SQLException  ex)   {
System.out.println("Database Connection Error."+ex.getMessage());
}

try {
// -- Use cloud sql remote ip address say x.x.x.x
String DBUrl = String.format("jdbc:mysql://x.x.x.x:3306/%s",databaseName);
Connection  DbConn = DriverManager.getConnection(DBUrl,DBUser,DBPwd);
} catch(SQLException  ex)   {
System.out.println("Database Connection Error."+ex.getMessage());
}