Inspectopedia
 
2024.3

Object instantiation inside 'equals()' or 'hashCode()'

Warning
New
Last modified: 03 December 2024

Reports construction of (temporary) new objects inside equals(), hashCode(), compareTo(), and Comparator.compare() methods.

Besides constructor invocations, new objects can also be created by autoboxing or iterator creation inside a foreach statement. This can cause performance problems, for example, when objects are added to a Set or Map, where these methods will be called often.

The inspection will not report when the objects are created in a throw or assert statement.

Example:

In this example, two additional arrays are created inside equals(), usages of age field require boxing, and name + age implicitly creates a new string.