'InputStream' and 'OutputStream' can be constructed using 'Files' methods

Reports new FileInputStream() or new FileOutputStream() expressions that can be replaced with Files.newInputStream() or Files.newOutputStream() calls respectively.

The streams created using Files methods are usually more efficient than those created by stream constructors.

Example:

InputStream is = new BufferedInputStream(new FileInputStream(file));

After the quick-fix is applied:

InputStream is = new BufferedInputStream(Files.newInputStream(file.toPath()));

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

IOStreamConstructor

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | Java | Performance

This inspection does not show warning if the language level 10 or higher, but the quick-fix is still available.

This inspection only reports if the language level of the project or module is 7 or higher.

New in 2022.1

Suppressing Inspection

You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:

//noinspection IOStreamConstructor

More detailed instructions as well as other ways and options that you have can be found in the product documentation:

IntelliJ IDEA 2025.2

Inspection Details
By default bundled with:	IntelliJ IDEA 2025.2, Qodana for JVM 2025.2,

Last modified: 18 September 2025