Command Line PSA: Watch out for Traps

There are a few commands that new CLI (command line interface) users should watch out for. Usually it starts with searching for a specific command online and long behold someone has an answer for you on an unknown forum. The command is:

rm -rf /

Or if you are on Windows …

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Java: Interface vs. Abstract Class

Date Category dev Tags java



  • Multiple inheritance
  • Does not provide any code
  • static final constants
  • A class implements an Interface
  • Usually describe peripheral abilities of a class


An Automobile class can implement an Automatic interface.

When To Use

Usually when something in the design will change frequently, such as a file format …

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