Nullability issues with generic types being used for Java interoperation.
Usage of the !! operator that is described below.ĭata inconsistency with regard to initialization, such as when:Īn uninitialized this available in a constructor is passed and used somewhere (a "leaking this").Ī superclass constructor calls an open member whose implementation in the derived class uses an uninitialized state.Īttempts to access a member of a null reference of a platform type The only possible causes of an NPE in Kotlin are:Īn explicit call to throw NullPointerException(). In Java this would be the equivalent of a NullPointerException, or an NPE for short. One of the most common pitfalls in many programming languages, including Java, is that accessing a member of a null reference will result in a null reference exception. Kotlin's type system is aimed at eliminating the danger of null references, also known as The Billion Dollar Mistake. To access the properties you can change, click the “Summary” tab.Įnter properties on the “Summary” tab such as “Title,” “Author,” “Company,” and “Keywords.” Keywords are also called tags and can be used to categorize and find your document more easily.Null safety Nullable types and non-null types On the right side of the “Info” screen, click “Properties” and select “Advanced Properties” from the drop-down list.Ī dialog box displays with the file name (without the file extension) on the title bar, showing you information about your document. If not, click “Info” at the top of the list of items on the left. To access the dialog box that allows you to change the properties for the currently open document, click the “File” tab.īy default, the “Info” screen should display.
NOTE: We used Word 2013 to illustrate this feature. Some of these are displayed on the “Info” screen and you can change these properties. Word also stores several additional advanced properties related to your documents. We recently showed you how to set the user information in Word.
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