logging

  • system.out.println()
    • not efficient
  •  log4j
    • framework
    • easy to control
      • all /, debug, info, warn, error, fatal
    • component
      • logger
      • appender
      • layout
  • Verbose logging
    • is a computer logging mode that records more information than the usual logging mode. (Verbose means “using more words than necessary”.)
    • Verbose logging options are usually enabled specifically for troubleshooting because they create large log files and can slow down performance
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