Java 8 : Arrays.stream

Arrays.stream(arr) .sum();

Arrays.stream(arr) .forEach(e->System.out.print(e + " "));
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Map < String, List < String >> phoneNumbers = 

new HashMap < String, List < String >> ();

phoneNumbers.put("John Lawson", Arrays.asList("3232312323", "8933555472"));

phoneNumbers.put("Mary Jane", Arrays.asList("12323344", "492648333"));

phoneNumbers.put("Mary Lou", Arrays.asList("77323344", "938448333"));

Map < String, List < String >> filteredNumbers = phoneNumbers

.entrySet()

.stream()

    .filter(x - > x.getKey().contains("Mary"))

    .collect(Collectors.toMap(p - > p.getKey(), p - > p.getValue()));

filteredNumbers.forEach((key, value) - > {

    System.out.println("Name: " + key + ": ");

    value.forEach(System.out::println);

});