Using IntelliJ IDEA Postfix Completion to Accelerate Java Development
This article introduces IntelliJ IDEA's powerful postfix completion feature, explains how to trigger it with a dot after an expression, and demonstrates ten common templates such as var declaration, null‑check, for‑loops, type casting and return statements, each illustrated with GIF examples.
Hello everyone, I’m Lei.
IntelliJ IDEA offers a remarkable feature called postfix completion (different from ordinary auto‑completion) that many developers are unaware of and still type code manually.
The feature lets you use code templates to complete statements quickly, such as generating loops (for, foreach), wrapping a string with String.format(), casting an expression, creating null‑check or non‑null checks, building if statements, or generating instanceof branches.
To use it, simply type a dot . after an expression and select a suggestion from the list; common candidates are shown with GIF demonstrations.
1. var declaration
2. null check
3. notnull check
4. nn check
5. for loop
6. fori with index
7. not (negation)
8. if condition
9. cast (type conversion)
10. return statement
Below the tutorial, a list of recent technical articles is provided, covering topics such as measuring code execution time, advanced Nginx usage, Java loop performance, and Java 8's StringJoiner, along with a link to a 7701‑page PDF of major tech company interview questions.
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