Magic number
Reports "magic numbers": numeric literals that are not named by a constant declaration.
Using magic numbers can lead to unclear code, as well as errors if a magic number is changed in one location but remains unchanged not another. The numbers 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 100, 1000, 0L, 1L, 2L, 0.0, 1.0, 0.0F and 1.0F are not reported by this inspection.
Example:
void checkFileSize(long bytes) {
if (bytes > 1_048_576) {
throw new IllegalArgumentException("too big");
}
}
A quick-fix introduces a new constant:
static final int MAX_SUPPORTED_FILE_SIZE = 1_048_576;
void checkFileSize(long bytes) {
if (bytes > MAX_SUPPORTED_FILE_SIZE) {
throw new IllegalArgumentException("too big");
}
}
- 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.
MagicNumber
Configure the inspection:
Use the Ignore constants in 'hashCode()' methods option to disable this inspection within
hashCode()
methods.Use the Ignore in annotations option to ignore magic numbers in annotations.
Use the Ignore initial capacity for StringBuilders and Collections option to ignore magic numbers used as initial capacity when constructing
Collection
,Map
,StringBuilder
orStringBuffer
objects.
Here you can find the description of settings available for the Magic number inspection, and the reference of their default values.
Inspection Details | |
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By default bundled with: | |
Can be installed with plugin: | Java, 243.23126 |
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