Redundant no-arg constructor

Reports unnecessary constructors.

A constructor is unnecessary if it is the only constructor of a class, has no parameters, has the same access modifier as its containing class, and does not perform any initialization except explicitly or implicitly calling the superclass constructor without arguments. Such a constructor can be safely removed as it will be generated by the compiler even if not specified.

Example:

  public class Foo {
    public Foo() {}
  }

After the quick-fix is applied:

public class Foo {}

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.

UnnecessaryConstructor

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 | Code style issues

Use the inspection settings to ignore unnecessary constructors that have an annotation.

Inspection options

Here you can find the description of settings available for the Redundant no-arg constructor inspection, and the reference of their default values.

Ignore constructors with an annotation: Not selected

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