Inspectopedia 2025.2 Help

'StringBuilder' without initial capacity

Reports attempts to instantiate a new StringBuffer or StringBuilder object without specifying its initial capacity.

If no initial capacity is specified, a default capacity is used, which will rarely be optimal. Failing to specify the initial capacity for StringBuffer may result in performance issues if space needs to be reallocated and memory copied when the initial capacity is exceeded.

Example:

// Capacity is not specified var sb = new StringBuilder();

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.

StringBufferWithoutInitialCapacity
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

Suppressing Inspection

You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:

//noinspection StringBufferWithoutInitialCapacity

More detailed instructions as well as other ways and options that you have can be found in the product documentation:

Inspection Details

By default bundled with:

IntelliJ IDEA 2025.2, Qodana for JVM 2025.2,

Last modified: 18 September 2025