新人教育に もっと Rubyを！
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This document shows a simple Java program with a main method that prints the text "Hello, world!" to the console. The main method uses the println method of the System.out object to display the message. This is a common first program used to demonstrate a basic Java application.
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This document shows a simple Java program with a main method that prints the text "Hello, world!" to the console. The main method uses the println method of the System.out object to display the message. This is a common first program used to demonstrate a basic Java application.
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