Can we open class file in Notepad?

Class files are binary files. They are not text files, and hence, can’t be opened by a text editor . To view the file, you’ll need some sort of editor just for binary files.

A class file is a byte code files , which is executed by the JVM, it has no meaning outside the JVM. Making it meaningful only on JVM but not outside, is what makes every java program run in its own sandbox . Now this byte-code is converted to machine level executable during Run-time by the JIT (Just In Time Compiler) .