To randomly generate integers in Java, you can use the java.util.Random class: nextInt(int bound): generate a random integer in the range of [0, bound) nextInt(): generate [-2^31, 2^ 31) Random integers within the range
Randomly generate random integers in Java
Generating random integers in Java can Use the java.util.Random
class, which provides the following methods:
int nextInt(int bound): 生成 [0, bound) 范围内的随机整数 int nextInt(): 生成 [-2^31, 2^31) 范围内的随机整数
Example:
Generate a random integer between 0 and 99 :
Random random = new Random(); int randomNumber = random.nextInt(100);
Generate a random integer between 10 and 100:
int randomNumber = random.nextInt(91) + 10; // 101 - 100 = 91
Notes:
-
nextInt(int bound )
The range of random numbers generated by the method is a closed interval, while the range of random numbers generated by thenextInt()
method is an open interval. - For the same
Random
instance, calling thenextInt()
method multiple times will produce a seemingly random but actually deterministic sequence. Therefore, it is recommended to use theSecureRandom
class when truly random numbers are required.
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