IntelliJ IDEA 14.1.1 Help

Instantiating Java Interface in Groovy

IntelliJ IDEA supports tight integration between Groovy and Java. For example, you can reference a Java interface from a Groovy script. So doing, you have to keep in mind that anonymous classes are not allowed in Groovy. That's why IntelliJ IDEA suggests a handy quick fix.

To instantiate a Java interface from a Groovy script

  1. Create a Java interface you want to instantiate in a Groovy script. For example:
  2. Open the desired Groovy script for editing, and type the following code:

    As you see, IntelliJ IDEA highlights this code as erroneous.

  3. Press Alt+Enter to reveal the quick fix, and click Dynamize invalid interface instantiation.
  4. Depending on the number of methods in the Java interface, the further behavior is different:
    • Java interface contains two or more methods. In this case, you have to specify which methods should be implemented:

      The instantiation code is converted to a map:

    • Java interface contains a single method. In this case, the instantiation code is converted silently to a closure:

See Also

Web Resources:

Last modified: 6 April 2015