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); } }