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Collection without initial capacity

Reports attempts to instantiate a new Collection object without specifying an initial capacity.

If no initial capacity is specified, a default capacity is used, which will rarely be optimal. Failing to specify initial capacities for collections may result in performance issues if space needs to be reallocated and memory copied when the initial capacity is exceeded. This inspection checks allocations of classes listed in the inspection's settings.

Example:

new HashMap<String, String>();

Use the following options to configure the inspection:

  • List collection classes that should be checked.

  • Whether to ignore field initializers.

Inspection options

Here you can find the description of settings available for the Collection without initial capacity inspection, and the reference of their default values.

Classes to check

[java.util.ArrayDeque, java.util.ArrayList, java.util.BitSet, java.util.HashMap, java.util.HashSet, java.util.Hashtable, java.util.IdentityHashMap, java.util.LinkedHashMap, java.util.LinkedHashSet, java.util.PriorityQueue, java.util.Vector, java.util.WeakHashMap, java.util.concurrent.ConcurrentHashMap, java.util.concurrent.PriorityBlockingQueue]

Don't report field initializers

Not selected

Inspection Details

By default bundled with:

IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,

Can be installed with plugin:

Java, 241.16690

Last modified: 29 April 2024