streams/RandomGenerators.java · ThisYoung/OnJava8-Examples

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OnJava8-Examples

streams

RandomGenerators.java

RandomGenerators.java 1.63 KB

// streams/RandomGenerators.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
import java.util.*;
import java.util.stream.*;

public class RandomGenerators {
 public static <T> void show(Stream<T> stream) {
 stream
 .limit(4)
 .forEach(System.out::println);
 System.out.println("++++++++");
 }
 public static void main(String[] args) {
 Random rand = new Random(47);
 show(rand.ints().boxed());
 show(rand.longs().boxed());
 show(rand.doubles().boxed());
 // Control the lower and upper bounds:
 show(rand.ints(10, 20).boxed());
 show(rand.longs(50, 100).boxed());
 show(rand.doubles(20, 30).boxed());
 // Control the stream size:
 show(rand.ints(2).boxed());
 show(rand.longs(2).boxed());
 show(rand.doubles(2).boxed());
 // Control the stream size and bounds:
 show(rand.ints(3, 3, 9).boxed());
 show(rand.longs(3, 12, 22).boxed());
 show(rand.doubles(3, 11.5, 12.3).boxed());
 }
}
/* Output:
-1172028779
1717241110
-2014573909
229403722
++++++++
2955289354441303771
3476817843704654257
-8917117694134521474
4941259272818818752
++++++++
0.2613610344283964
0.0508673570556899
0.8037155449603999
0.7620665811558285
++++++++
16
10
11
12
++++++++
65
99
54
58
++++++++
29.86777681078574
24.83968447804611
20.09247112332014
24.046793846338723
++++++++
1169976606
1947946283
++++++++
2970202997824602425
-2325326920272830366
++++++++
0.7024254510631527
0.6648552384607359
++++++++
6
7
7
++++++++
17
12
20
++++++++
12.27872414236691
11.732085449736195
12.196509449817267
++++++++
*/

Copy Edit Raw Blame History

Bruce Eckel authored 2016年12月31日 09:23 +08:00 . Date change

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86

// streams/RandomGenerators.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
import java.util.*;
import java.util.stream.*;

public class RandomGenerators {
 public static <T> void show(Stream<T> stream) {
 stream
 .limit(4)
 .forEach(System.out::println);
 System.out.println("++++++++");
 }
 public static void main(String[] args) {
 Random rand = new Random(47);
 show(rand.ints().boxed());
 show(rand.longs().boxed());
 show(rand.doubles().boxed());
 // Control the lower and upper bounds:
 show(rand.ints(10, 20).boxed());
 show(rand.longs(50, 100).boxed());
 show(rand.doubles(20, 30).boxed());
 // Control the stream size:
 show(rand.ints(2).boxed());
 show(rand.longs(2).boxed());
 show(rand.doubles(2).boxed());
 // Control the stream size and bounds:
 show(rand.ints(3, 3, 9).boxed());
 show(rand.longs(3, 12, 22).boxed());
 show(rand.doubles(3, 11.5, 12.3).boxed());
 }
}
/* Output:
-1172028779
1717241110
-2014573909
229403722
++++++++
2955289354441303771
3476817843704654257
-8917117694134521474
4941259272818818752
++++++++
0.2613610344283964
0.0508673570556899
0.8037155449603999
0.7620665811558285
++++++++
16
10
11
12
++++++++
65
99
54
58
++++++++
29.86777681078574
24.83968447804611
20.09247112332014
24.046793846338723
++++++++
1169976606
1947946283
++++++++
2970202997824602425
-2325326920272830366
++++++++
0.7024254510631527
0.6648552384607359
++++++++
6
7
7
++++++++
17
12
20
++++++++
12.27872414236691
11.732085449736195
12.196509449817267
++++++++
*/