arr[i] = (int) ((maxValue + 1) * Math.random()) - (int) (maxValue * Math.random());
时间: 2024-05-29 17:12:50 浏览: 12
This line of code generates a random integer and assigns it to the ith element of the array arr. The value of the random integer is calculated as follows:
1. First, the variable maxValue is used to determine the range of possible values for the random integer.
2. The expression (maxValue + 1) * Math.random() generates a random double between 0 and maxValue + 1. This value is then cast to an int, which truncates the decimal part and leaves an integer between 0 and maxValue.
3. The expression maxValue * Math.random() generates another random double between 0 and maxValue. This value is also cast to an int.
4. The two random integers generated in steps 2 and 3 are subtracted from each other to produce a final random integer. This integer can be positive, negative, or zero, depending on the relative values of the two random integers.
Overall, this line of code is used to fill an array with random integer values within a certain range. The range is determined by the value of maxValue, and the randomness of the values is ensured by the use of the Math.random() method.
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