First Groovy

 1 class Sample {

 2     def names = ["anna", "annie", "tommy", "bobby", "doggy"];

 3 

 4     public static void main(def args) {

 5         //Loop

 6         for (i in 0..5) {

 7             println "Hello, World!"

 8         }

 9 

10         //Closure

11         def sample = new Sample();

12         //Operation of array

13         sample.names << "Terry";

14         println sample.names;

15 

16         println "-------"

17         //lambda expression   each

18         sample.names.each({ e -> println(e) });

19 

20         println "-------"

21         //keyword it.

22         sample.names.each { println it }

23 

24         println "-------"

25 

26         //filter

27         List<String> matched = sample.names.findAll { e -> e.contains("o") }

28         matched.each { println it }

29 

30         println "-------"

31         //sort

32         sample.names << "William";

33         sample.names << "bob";

34         List<String> sorted = sample.names.sort({ e -> e.length() })

35         sorted.each { println it }

36 

37         println "-------"

38         //grouped

39         Map<Boolean, String> grouped = sample.names.groupBy { e -> e.contains("o") }

40         grouped.each { key, value -> println "$key:$value" }

41     }

42 }