@Test

     void predicateTest() throws Exception {

         List<String> languages = Arrays.asList("Java", "Scala", "C++", "Haskell", "Lisp");

         System.out.println("Languages which starts with J :");

         filter(languages, (str) -> ((String) str).startsWith("J"));

         System.out.println("Languages which ends with a ");

         filter(languages, (str) -> ((String) str).endsWith("a"));

         System.out.println("Print all languages :");

         filter(languages, (str) -> true);

         System.out.println("Print no language : ");

         filter(languages, (str) -> false);

         System.out.println("Print language whose length greater than 4:");

         filter(languages, (str) -> ((String) str).length() > 4);

     }

     public static void filter(List names, Predicate condition) {

         for (String name : names) {

             if (condition.test(name)) {

                 System.out.println(name + " ");

             }

         }

     }