如何用随机不可变值填充数组？
private void create(){
byte[] arr = new byte[20];
new Random().nextBytes(arr);
}
始终生成随机值。
如何创建不可变的随机值？
问题来源：Stack Overflow
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您需要种子值才能返回相同的字节集。
import java.util.Arrays; import java.util.Random; public class Main { public static void main(String[] args) { byte[] arr = new byte[20]; // Generating a random seed for demo. You can assign a fixed value e.g. 1 to seed. int seed = new Random().nextInt(); System.out.println("Going to print the byte array 10 times for the seed " + seed); for (int i = 1; i <= 10; i++) { create(arr, seed); System.out.println(Arrays.toString(arr)); } } private static void create(byte[] arr, int seed) { Random random = new Random(seed); random.nextBytes(arr); } }运行示例：
Going to print the byte array 10 times for the seed -932843232 [74, 4, -46, -54, 49, 14, 32, -61, 20, -5, 1, 49, -64, -98, 68, 2, -74, 56, 28, -31] [74, 4, -46, -54, 49, 14, 32, -61, 20, -5, 1, 49, -64, -98, 68, 2, -74, 56, 28, -31] [74, 4, -46, -54, 49, 14, 32, -61, 20, -5, 1, 49, -64, -98, 68, 2, -74, 56, 28, -31] [74, 4, -46, -54, 49, 14, 32, -61, 20, -5, 1, 49, -64, -98, 68, 2, -74, 56, 28, -31] [74, 4, -46, -54, 49, 14, 32, -61, 20, -5, 1, 49, -64, -98, 68, 2, -74, 56, 28, -31] [74, 4, -46, -54, 49, 14, 32, -61, 20, -5, 1, 49, -64, -98, 68, 2, -74, 56, 28, -31] [74, 4, -46, -54, 49, 14, 32, -61, 20, -5, 1, 49, -64, -98, 68, 2, -74, 56, 28, -31] [74, 4, -46, -54, 49, 14, 32, -61, 20, -5, 1, 49, -64, -98, 68, 2, -74, 56, 28, -31] [74, 4, -46, -54, 49, 14, 32, -61, 20, -5, 1, 49, -64, -98, 68, 2, -74, 56, 28, -31] [74, 4, -46, -54, 49, 14, 32, -61, 20, -5, 1, 49, -64, -98, 68, 2, -74, 56, 28, -31]回答来源：Stack Overflow
2020-03-26 22:43:39赞同 展开评论 打赏
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