JAR File

• JAR (Java ARchive) files have a .jar extension
• They contains multiple .class files, resources and metadata all compressed into a single executable file
• You mention the first file that you want to call upon execution in the MAIFEST.MF file within the JAR
• The META-INF/MANIFEST.MF holds the metadata, including,
  • package info of different files
  • security properties of different files
• JARs can be easily distributed around and used

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Related §

• Java workflow for multiple files