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Unnecessary 'null' check before 'equals()' call

Reports comparisons to null that are followed by a call to equals() with a constant argument.

Example:

if (s != null && s.equals("literal")) {}

After the quick-fix is applied:

if ("literal".equals(s)) {}

Use the inspection settings to report equals() calls with a non-constant argument when the argument to equals() is proven not to be null.

Inspection options

Option

Type

Default

Report equals with non-constant not-null argument

Checkbox

true

Inspection Details

Available in:

IntelliJ IDEA 2023.3, Qodana for JVM 2023.3

Plugin:

Java, 233.SNAPSHOT

Last modified: 13 July 2023