14.7-2

1  PackageJihe;2 3 ImportJava.util.*;4 5  Public classTest {6     7      Public Static voidMain (string[] args)8     {9         //create an instance of the Set classTenSet<string> set =NewTreeset<>(); One          A         //adding elements -Set.add ("A"); -Set.add ("a"); theSet.add ("C"); -Set.add ("C"); -Set.add ("a"); -          +         //iterating through the collection -          for(String x:set) +         { ASystem.out.println ("set =" +x); at         } -          -          -          -          -          in         //to create an instance of the list class -list<string> list =NewArraylist<>(); to          +         //adding elements -List.add ("A"); theList.add ("a"); *List.add ("C"); $List.add ("C");Panax NotoginsengList.add ("a"); -          the         //iterating through the collection +          for(String x:list) A         { theSYSTEM.OUT.PRINTLN ("list =" +x); +         } -          $          $     } -  -}

Run results

Set = A
Set = C
set = a
Set = C
List = A
List = a
List = C
List = C
List = a

14.7-2