Java Reference
In-Depth Information
37
38
// product of values with reduce method
39
System.out.printf(
"Product via reduce method: %d%n"
,
40
IntStream.of(values)
.reduce(
1
, (x, y) -> x * y)
41
);
42
43
// even values displayed in sorted order
44
System.out.printf(
"%nEven values displayed in sorted order: "
);
45
IntStream.of(values)
.filter(value -> value %
2
==
0
)
.sorted()
.forEach(value -> System.out.printf(
"%d "
, value));
46
47
48
49
System.out.println();
50
51
// odd values multiplied by 10 and displayed in sorted order
52
System.out.printf(
53
"Odd values multiplied by 10 displayed in sorted order: "
);
54
IntStream.of(values)
.filter(value -> value %
2
!=
0
)
.map(value -> value *
10
)
.sorted()
.forEach(value -> System.out.printf(
"%d "
, value));
55
56
57
58
59
System.out.println();
60
61
// sum range of integers from 1 to 10, exlusive
62
System.out.printf(
"%nSum of integers from 1 to 9: %d%n"
,
63
IntStream.range(
1
,
10
).sum()
);
64
65
// sum range of integers from 1 to 10, inclusive
66
System.out.printf(
"Sum of integers from 1 to 10: %d%n"
,
67
IntStream.rangeClosed(
1
,
10
).sum()
);
68
}
69
}
// end class IntStreamOperations
Original values: 3 10 6 1 4 8 2 5 9 7
Count: 10
Min: 1
Max: 10
Sum: 55
Average: 5.50
Sum via reduce method: 55
Sum of squares via reduce method: 385
Product via reduce method: 3628800
Even values displayed in sorted order: 2 4 6 8 10
Odd values multiplied by 10 displayed in sorted order: 10 30 50 70 90
Sum of integers from 1 to 9: 45
Sum of integers from 1 to 10: 55
Fig. 17.5
|
Demonstrating
IntStream
operations. (Part 2 of 2.)
