抽彩游戏,从n个数中随机选取k个
public class LotteryDrawing { public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.println("How many numbers do you need draw? "); int k = in.nextInt(); System.out.println("What is the highest number you can draw"); int n = in.nextInt(); int[] numbers = new int[n]; for (int i = 0 ; i < numbers.length; i++) { numbers[i] = i + 1; } //draw k number and put them into a second array int[] result = new int[k]; for (int i = 0; i < result.length; i++) { int r = (int) (Math.random() * n); result[i] = numbers[r]; numbers[r] = numbers[n - 1]; n--; } //print the sorted array Arrays.sort(result); System.out.println("Bet the following combination. It'll make you rich!"); for (int r : result) { System.out.println(r); } } }