How to use termianl window to compile java program Mac OSX?

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I have got a program in jva called converter.java, its saved in Documents on a Mac book pro computer, running OSX, how do i compile the program.

thanks

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia��).