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

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.

RandomDoubleForRandomInteger

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

Availability

By default bundled with: IntelliJ IDEA 2024.1, Qodana for JVM 2024.1,
Can be installed with plugin: Java, 241.18072

Last modified: 18 June 2024