In .gitignore file will be ignored such types of files as:

• compiled class files (.class);
• log files (.log);
• BlueJ files (.ctxt);
• Mobile Tools for Java (J2ME);
• Package Files (.jar, .war, .nar, .ear, .zip, .tar.gz, .rar)
• virtual machines crash logs (hs_err_pid, replay_pid)
• some Gradle and IntelliJ IDEA files