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Unnecessary zero length array usage

Reports allocations of arrays with known lengths of zero when there is a constant for that in the class of the array's element type. As zero-length arrays are immutable, you can save memory reusing the same array instance.

Example:

class Item { // Public zero-length array constant that can be reused public static final Item[] EMPTY_ARRAY = new Item[0]; } class EmptyNode { Item[] getChildren() { // Unnecessary zero-length array creation return new Item[0]; } }

After the quick-fix is applied:

class EmptyNode { Item[] getChildren() { return Item.EMPTY_ARRAY; } }

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