Tutorial by Topics

A classloader is a class whose primary purpose is to mediate the location and loading of classes used by an application. A class loader can also find and loaded resources. The standard classloader classes can load classes and resources from directories in the file system and from JAR and ZIP fil...

Not everything that starts with a backslash is an escape sequence. Many characters are just not useful to escape sequences, and will simply cause a preceding backslash to be ignored. "\H\e\l\l\o" === "Hello" // true On the other hand, some characters like "u" and...

JavaFX Scene Builder is a visual layout tool that lets users quickly design JavaFX application user interfaces, without coding. It is used to generate FXML files. JavaFX Scene Builder is a visual layout tool that lets users quickly design JavaFX application user interfaces, without coding. Use...

ParameterDescriptiongroup.idThe name of the Consumer Group.enable.auto.commitAutomatically commit offsets; default: true.auto.commit.interval.msThe minimum delay in milliseconds between to commits (requires enable.auto.commit=true); default: 5000.auto.offset.resetWhat to do when there is no valid c...

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

ParameterDetailsparametersMapExpressionThe Map with parameters. Not requiredsubreportParameterThe pair of name and value (set with subreportParameterExpression). Not required. Several parameters can be passed to subreportconnectionExpressionConnection for getting data. Not requireddataSourceExpress...

The topic uses PHP-ML for all machine learning algorithms. The installation of the library can be done using composer require php-ai/php-ml The github repository for the same can be found here. Also it is worth noting that the examples given are very small data-set only for the purpose of dem...

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, ...

official documentation: Prepared Statement Object

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. ...