Groovy adds a lot of useful methods to standard JDK classes. For example Groovy adds the equals() method to List and Object[] so both can be compared. We must make sure the array is of type Object[] to make it work. Also the equals() method is added to arrays of type int.
def numbers1 = [1,2,3] as int[] def numbers2 = [1,2,3] as int[] def numbers3 = [1,2] as int[] assert numbers1.equals(numbers2) assert numbers2 == numbers1 assert !(numbers1.equals(numbers3)) def list = ['Groovy', 'Grails', 'Gradle'] def stringArray1 = ['Grails', 'Gradle', 'Groovy'] as Object[] def stringArray2 = ['Groovy', 'Grails', 'Gradle'] as Object[] assert list.equals(stringArray2) assert list == stringArray2 assert !(list.equals(stringArray1)) // order matters assert list != stringArray1
