从K个数中产生n(n<k)个不同的数，可用于抽奖程序！

package com.czp;


import java.util.Arrays;
import java.util.Scanner;


public class DrawNumber {


public static void main(String[] args) {
System.out.println("How many numbr do you want?");
Scanner scanner = new Scanner(System.in);
int k = scanner.nextInt();
System.out.println("What is the hightest number you can draw?");
int n = scanner.nextInt();
int[] x = new int[n]; 
for(int i=0;i<n;i++)
{
x[i]=i;
}
int[] result =  new int[k];
for(int i=0;i<k;i++)
{
int r =(int)(Math.random()*n);
result[i]=x[r];
x[r]=x[n-1];
n--;

}
Arrays.sort(result);
for (int i : result) {
System.out.println(i);
}
}
}