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This should help you understand a "Null Pointer Exception" -- one gets one of those because an object reference is null, but the program code expects the program to use something in that object reference. However, that deserves its own topic...

This topic describes a number of "pitfalls" (i.e. mistakes that novice java programmers make) that relate to Java application performance. This topic describes some "micro" Java coding practices that are inefficient. In most cases, the inefficiencies are relatively small, ...

request.files['name'] # single required file request.files.get('name') # None if not posted request.files.getlist('name') # list of zero or more files posted CombinedMultiDict((request.files, request.form)) # combine form and file data

Enumerations consist of the enum keyword and an optional identifier followed by an enumerator-list enclosed by braces. An identifier is of type int. The enumerator-list has at least one enumerator element. An enumerator may optionally be "assigned" a constant expression of type int. ...

This section provides an overview of what azure-active-directory is, and why a developer might want to use it. It should also mention any large subjects within azure-active-directory, and link out to the related topics. Since the Documentation for azure-active-directory is new, you may need to c...

using JSON JSON.parse(str) JSON.json(obj) JSON.print(io, obj, indent) Since neither Julia Dict nor JSON objects are inherently ordered, it's best not to rely on the order of key-value pairs in a JSON object.

Set IFS to newline: IFS=$'\n' Set IFS to nullstring: IFS= Set IFS to / character: IFS=/ ParameterDetailsIFSInternal field separator-xPrint commands and their arguments as they are executed (Shell option) Word splitting is not performed during assignments e.g newvar=$var Word splitting...

ParameterDetailsIFSInternal field separatorfileA file name/path-rPrevents backslash interpretation when used with read-tRemoves a trailing newline from each line read by readarray-d DELIMContinue until the first character of DELIM is read (with read), rather than newline

BufferedImage.getGraphics() always returns Graphics2D. Using a VolatileImage may significantly improve the speed of drawing operations, but also has its drawbacks: its contents may be lost at any moment and they may have to be redrawn from scratch.

This section provides an overview of what amazon-redshift is, and why a developer might want to use it. It should also mention any large subjects within amazon-redshift, and link out to the related topics. Since the Documentation for amazon-redshift is new, you may need to create initial version...

This section provides an overview of what opencart2.x is, and why a developer might want to use it. It should also mention any large subjects within opencart2.x, and link out to the related topics. Since the Documentation for opencart2.x is new, you may need to create initial versions of those r...