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[Ruby] What is Rails Active Record?

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Active Record seems to be a function of Ruby on Rails that allows you to handle the data existing in the database without writing SQL directly in Ruby on Ra...

[Java] Questions about Android studio.

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I am creating my own android application, but it is repeatedly stopped even when I start the application, and it does not work well I confirmed Logcat, but ...

[Java] portfolio

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Portfolio 1

[Java] Java lambda expression

3 minute read

What is a lambda expression The description method introduced in Java8. Similarly, the Stream API 1 introduced in Java8 is based on the assumption that lamb...

[Java] Classes that require exception handling

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Checked exceptions mean that there is no file that should be opened, etc. Exception handling is essential because it is a situation that can occur depending...

[Java] Calculator program

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// keyboard input import import; import; import; import java.math.BigDecimal;

[Ruby] About Ruby methods

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Diary of studying programming July 10, 2020 Progate Lv.165 RubyⅢ

[Java] About inheritance (JavaSilver)

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In order to get JavaSilver, I am trying to summarize the parts that are not well understood in the basics of Java.

[Ruby] [Rails] Introduction of Rubocop by beginners

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Introduction Rubocop is a static code analysis tool for Ruby. ruby-style-guide , point out the modifications and improvements of the source code.