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How do Java programs not require a JRE?

I had a new installation and before installing Java I managed to start NetBeans and OpenOffice. If these programs were written in Java, how is this possible? I know that there are several converters .classto .exe, but I thought it hacks (not suitable for large applications that are deployed all over the world). What is the general approach to deploying a Java application without a JRE? Is there a standard or most common way?

At first I thought it was due to Jar files, but from what I am blushing, an existing Java installation is required to execute them.

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Source: https://habr.com/ru/post/1666114/

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