'size() == 0' can be replaced with 'isEmpty()'

Reports .size() or .length() comparisons with a 0 literal that can be replaced with a call to .isEmpty().

Example:

boolean emptyList = list.size() == 0;

After the quick-fix is applied:

boolean emptyList = list.isEmpty();

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.

SizeReplaceableByIsEmpty

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 | Code style issues

Use the Ignored classes table to add classes for which any .size() or .length() comparisons should not be replaced.

Use the Ignore expressions which would be replaced with !isEmpty() option to ignore any expressions which would be replaced with !isEmpty().

Inspection options

Here you can find the description of settings available for the 'size() == 0' can be replaced with 'isEmpty()' inspection, and the reference of their default values.

Ignored classes: Empty
Ignore expressions which would be replaced with '!isEmpty()': Not selected

Availability

By default bundled with: IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,
Can be installed with plugin: Java, 241.18072

Last modified: 18 June 2024