A .jar file in a target or bin folder that can be executed directly if the environment has Java installed.
If you didn't download this from a known repository like GitHub or SourceForge , it is recommended to scan it with an antivirus before extracting. Where did you download this file from, and Free Automated Malware Analysis Service j-textui-main.rar
Files with the .rar extension from unverified sources can sometimes carry risks. j-textui-main.rar