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

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


class Person { private String name; private int age; public boolean equals(Object o) { return Arrays.equals(new Object[] {name, age}, new Object[] {((Foo)o).name, ((Foo)o).age}); } public int hashCode() { return (name + age).hashCode(); } }

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

Locating this inspection


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

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


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