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  • LotteryDrawing

    import java.util.*;
    
    public class MyTest{
        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
                //ps: I guess the author must consider the Poker when he write down these codes ..........
                numbers[r] = numbers[n - 1];
                n --;
            }
    
            //print the sorted array
            Arrays.sort(result);
            System.out.print("Bet the following combination. It's make you rich!");
            for(int r: result)
                System.out.println(r);
        }
    }
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  • 原文地址:https://www.cnblogs.com/xkxf/p/6152808.html
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