Try making a calculator app in Java

The Java development environment uses OpenJDK 11.0.4 installed on Ubuntu 18.04.

Let's make a GUI calculator application using Java that I was studying before. The GUI part uses javax.swing.

The table of contents below is a rough list of immediate goals. I am thinking of updating it as it progresses.

I think there are many unfamiliar parts, so there may be parts that are misused or interpreted, such as programming terms. I would appreciate it if you could give me some advice at that time.

Reference site

Java® Platform, Standard Edition & Java Development Kit Version 11 API Specification -Let's use Let's programming Swing

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