How to safely change console codepage encoding in Windows 10 or in JDK 1.8?

Question

Java

When executed in the Windows 10 java.class console, the Cyrillic text pops up as a blurry character. There are no such symbols even on the smartphone keyboard. Console codepage 866, jdk (version 1.8) - cp 1251.
I am a beginner, more precisely 0, in computer science and programming. I tried to google: entering the command line chcp 1251 does not change anything, making changes through the registry, according to various forum members, advisers, can cause system errors.
Nothing fatal, but I want to start getting acquainted with programming through the console. How to safely change codepage encoding either in Windows 10 console or jdk (JVM)?
Thank you all in advance, and for good advice - doubly.

Answer 1

Find on the Internet these, ancient, like mammoth shit, the article "java, Russian letters and more." It is still relevant, sometimes still.
I looked for you, do not thank - citforum.ru/internet/javascript/java_rbint.shtml