Using 'Random.nextDouble()' to get random integer

Reports calls to java.util.Random.nextDouble() that are used to create a positive integer number by multiplying the call by a factor and casting to an integer.

For generating a random positive integer in a range, java.util.Random.nextInt(int) is simpler and more efficient.

Example:

  int getRandomInt() {
    return (int) ((new Random()).nextDouble() * SIZE);
  }
  

After the quick-fix is applied:

  int getRandomInt() {
    return (new Random()).nextInt(SIZE);
  }

Locating this inspection

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Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

UsingRandomNextDoubleForRandomInteger

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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

Inspection Details
By default bundled with:	IntelliJ IDEA 2024.3, Qodana for JVM 2024.3,
Can be installed with plugin:	Java, 243.23126

Last modified: 03 December 2024