Recent Posts

[Java] Java threading

2 minute read

[Java thread processing]

[Java] Java string

1 minute read

[Java string]

[Java] Java add form field to PDF

2 minute read

PDF form fields, also known as interactive fields, are primarily used to collect user information. Common form fields include radio buttons, check boxes, li...

[Java] Builder pattern

3 minute read

What is the ###Builder pattern? This refers to a pattern in which each part that makes up the whole is created and assembled in stages.

[Java] AbstractFactory pattern

4 minute read

What is AbstractFactory pattern? Create abstract products by combining abstract parts. Pay attention to the interface (API), not to the specific mounting of...

[Java] [Java] Random method

less than 1 minute read

Java.util.Random java.lang.Math, a class that comes with Java from the beginning There are these two.

[Java] VisualVM (JMX connection) with Kubernetes

4 minute read

Introduction This time I’m going to connect to a Java app running on k8s with VisualVM. I think it will be used when monitoring and analyzing Java applicati...

[Java] How to create H2 Database database anywhere

less than 1 minute read

Introduction When creating a new H2DB database, the system default JDBC URL: jdbc:h2:~/test (not C:\Documents and Settings[username]\test) This is a solutio...

[Java] [Java basics] What is Class

6 minute read

Introduction This article is friendly Java I wrote it for the purpose of organizing the knowledge I learned by myself with the reference book.