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  • HAS-A, IS-A terminology in object oriented language
    This is object-oriented programming and UML terminology, not Java-specific There are actually three cases you should be aware of: A House is a Building (inheritance); A House has a Room (composition); A House has an occupant (aggregation) The difference between (2) and (3) is subtle yet important to differentiate Together they are forms of association What's the difference? Composition
  • What is the difference between IS -A relationship and HAS-A . . .
    An IS-A relationship is inheritance The classes which inherit are known as sub classes or child classes On the other hand, HAS-A relationship is composition In OOP, IS-A relationship is completely inheritance This means, that the child class is a type of parent class For example, an apple is a fruit So you will extend fruit to get apple
  • Inheritance or composition: Rely on is-a and has-a?
    If the relationship is "is-a" - use inheritance, and if the relationship is "has-a" - use composition Is it always right? In a sense, yes But you must be careful not to introduce unnecessary, artificial "is-a" relationships For example, one may think that a ThickBorderedRectangle is-a Rectangle, which seems reasonable at first sight, and decide to use inheritance But this situation is
  • How to get all groups that a user is a member of? - Stack Overflow
    PowerShell's Get-ADGroupMember cmdlet returns members of a specific group Is there a cmdlet or property to get all the groups that a particular user is a member of?
  • java - What is a JavaBean exactly? - Stack Overflow
    A JavaBean is just a standard It is a regular Java class, except it follows certain conventions: All properties are private (use getters setters) A public no-argument constructor Implements Serializable That's it It's just a convention Lots of libraries depend on it though With respect to Serializable, from the API documentation: Serializability of a class is enabled by the class
  • github - Why is a git pull request not called a push request . . .
    The terminology used to merge a branch with an official repository is a 'pull request' This is confusing, as it appears that I am requesting to push my changes to the official repository Why is it
  • How do we implement an IS-A Relationship? - Stack Overflow
    IS-A is not a relationship per se A row's identity is typically defined by the name of the table that contains it eg A row in a table called employees IS-A employee If you want to add an employee_type enumueration containing TECHINICIAN, ADMINISTRATIVE, etc , that's fine But each row in that table still IS-A employee
  • Is there a way to crack the password on an Excel VBA Project?
    @Fandango68 This question was discussed years ago on meta TLDR: Lots (most?) of the questions on SO could be abused by bad actors, but unless there is clear evidence of wrongdoing, we assume good faith There are plenty of legitimately legal and ethical reasons to crack a VBA password Additionally, discussing weaknesses of the current systems ultimately contributes to better security in the
  • How do I test if a variable is a number in Bash? - Stack Overflow
    Bash does provide a reliable means of determining if a number is an INTEGER { VAR="asdfas" ; ( ( VAR )) ; echo $?; } The equation will correctly fail if the answer is '0' because '0' is not an integer I had the very same problem just a few minutes ago and found this thread with a quick serarch I hope this helps others Other people were close though
  • What is a NullReferenceException, and how do I fix it?
    I have some code and when it executes, it throws a NullReferenceException, saying: Object reference not set to an instance of an object What does this mean, and what can I do to fix this error?





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