- import java.util.*;
- /**
- * This program demonstrates array manipulation.
- */
- public class LotteryDrawing
- {
- public static void main(String[] args)
- {
- Scanner in = new Scanner(System.in);
- System.out.print("How many numbers do you need to draw? ");
- int k = in.nextInt();
- System.out.print("What is the highest number you can draw? ");
- int n = in.nextInt();
- // fill an array with numbers 1 2 3 . . . n
- int[] numbers = new int[n];
- for (int i = 0; i < numbers.length; i++)
- numbers[i] = i + 1;
- // draw k numbers and put them into a second array
- int[] result = new int[k];
- for (int i = 0; i < result.length; i++)
- {
- // make a random index between 0 and n - 1
- int r = (int) (Math.random() * n);
- // pick the element at the random location
- result[i] = numbers[r];
- // move the last element into the random location
- 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);
- }
- }
- //该片段来自于http://www.codesnippet.cn/detail/0501201511471.html
来源: http://www.codesnippet.cn/detail/0501201511471.html