Learning Groovy 3: Java-Based Dynamic Scripting

© Adam L. Davis 2019

Adam L. DavisLearning Groovy 3https://doi.org/10.1007/978-1-4842-5058-7_5

5. Coming from Java

Adam L. Davis¹ 

(1)

New York, NY, USA

 

Since most readers are already familiar with Java, it would be helpful to compare common Java idioms with the Groovy equivalent.

Default Method Values

One thing that might surprise you coming from Java is that in Groovy you can provide default values for method parameters. For example, let’s say you have a fly method with a parameter called text:

1   def fly(String text = "flying") {println text}

Note

Using the "def" keyword in this way defines a method with return type of java.lang.Object.

This would essentially create two methods behind the scenes (from a Java standpoint):

1   def  fly() {println "flying"} ...