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Unnecessary boxing

Reports explicit boxing, that is wrapping of primitive values in objects.

Explicit manual boxing is unnecessary as of Java 5 and later, and can safely be removed.

Examples:

  • Integer i = new Integer(1);Integer i = Integer.valueOf(1);

  • int i = Integer.valueOf(1);int i = 1;

Use the Only report truly superfluously boxed expressions option to report only truly superfluous boxing, where a boxed value is immediately unboxed either implicitly or explicitly. In this case, the entire boxing-unboxing step can be removed. The inspection doesn't report simple explicit boxing.

This inspection only reports if the language level of the project or module is 5 or higher.

Inspection options

Here you can find the description of settings available for the Unnecessary boxing inspection, and the reference of their default values.

Only report truly superfluously boxed expressions

Not selected

Inspection Details

By default bundled with:

IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,

Can be installed with plugin:

Java, 241.14841

Last modified: 12 March 2024