Java™ How To Program (Early Objects), Tenth Edition

17.4 Stream<Integer> Manipulations

[This section demonstrates how lambdas and streams can be used to simplify programming tasks that you learned in Chapter 7, Arrays and ArrayLists.]

Just as class IntStream’s method of can create an IntStream from an array of ints, class Array’s stream method can be used to create a Stream from an array of objects. Figure 17.6 performs filtering and sorting on a Stream<Integer>, using the same techniques you learned in Section 17.3. The program also shows how to collect the results of a stream pipeline’s operations into a new collection that you can process in subsequent statements. Throughout this example, we use the Integer array values (line 12) that’s initialized with int values—the compiler boxes each ...