How to define one-to-one relationship in MySQL
How to define one-to-one relationship in MySQL using the foreign key and unique property to limit the row count from the child table
ISO8583 flows, fields meaning and values
ISO8583 message flows, data elements values and meanings. Message flows examples, most used data elements and values.
ISO8583 financial transaction message format
Introduction to ISO8583 financial transaction message format. Parts: message type indicator, one or more bitmaps and data elements.
How to read and write files in Java
How to read and write files in Java using BufferedReader and BufferedWriter. The example highlights the classic resource release and try-with-resource approach.
Java Exceptions handling
How to handle exceptions in Java. Checked and unchecked exceptions example using custom implementation.
How to convert object to / from JSON using Jackson
How to convert Java object to / from JSON string using Jackson library. Simple example including embedded object.
