How does this code that fills an array with 10 distinct random numbers work?

See my comments in the code itself:

public static void main(String[] args){
//make a new array of 10 integers
int a[] = new int[10];

//declare an object which we can use to generate random numbers
//this object probably uses the system time to generate numbers that appear random
//but at the end of the day, java does it for us so
//we don't really need to know or care how it generates random numbers
Random randomGenerator = new Random();

//loop over each element in our array
for (int i = 0; i < a.length; i++){
//for each element, set that element to a random between 1 and 100 inclusive
//nextInt(x) gets a number between 0 (inclusive) and x (not inclusive)
//so to translate that to 1 to x inclusive, we need to add 1 to the result
a[i] = 1 + randomGenerator.nextInt(100);
}

//everything below here does literally nothing to solve the problem
//everything you need to fill the array with random numbers is above

for (int i = 0; i < a.length; i++) {
int number = 1 + randomGenerator.nextInt(100);
int count = 0;
for (int j = 0; j < i; j++) {
if (a[j] == number) {
count += 1;
}
}
if (count > 0) i -= 1;
else a[i] = number;
}
}
}


Please note that you should use 1 + randomGenerator.nextInt(10); to fill the array with numbers between 1 and 10, not 1 + randomGenerator.nextInt(100);.