Das könnte so aussehen:
Java:... int[] array = new Array[n]; ...
public static void main(String[] args) {
int[] array = new int[25];
Random rnd = new Random();
for (int i = 0; i < array.length; i++) {
array[i] = rnd.nextInt(999) + 1 + 100;
}
int num = rnd.nextInt(array.length);
array[num] = rnd.nextInt(100) + 1;
int num1;
do {
num1 = rnd.nextInt(array.length);
} while (num1 == num);
array[num1] = rnd.nextInt(100) + 1;
for (int i = 0; i < array.length; i++) {
System.out.println(array[i]);
}
}