IntelliJ IDEA Postfix Completion: How to Quickly Generate Common Code Snippets

IntelliJ IDEA offers a powerful feature called postfix completion, which differs from standard autocomplete by allowing developers to type a dot after an expression and then select a template to expand the code.

The feature can generate a variety of common constructs, including variable declarations, null‑checks, non‑null checks, indexed loops, simple loops, logical negations, conditional statements, type casts, and return statements, all with a few keystrokes.

To use it, place the cursor after an expression, type a period, and either type a hint or choose from the displayed list; each option is illustrated with a GIF in the original article.

Examples demonstrated include:

var declaration

null check (null)

non‑null check (notnull)

nn (another non‑null shortcut)

for loop traversal

fori with index

logical NOT

if condition

cast for strong type conversion

return statement

The article concludes with a thank‑you note and links to additional resources and projects.