用一个能产生[1,m]的随机函数， 实现一个能随机产生一个[1, n]的函数。

import java.util.Random;public class MyRandom {public static int random(int m,int n){int c = (int) (Math.log(n-1)/Math.log(m))+1;    Random random = new Random();    int sum = 0;        while(true){    sum = random.nextInt(m);    for(int i=1; i<c; i++){    sum = sum*m + random.nextInt(m);    }    if(sum < n) break;    }    return sum+1;}public static void main(String [] args){int [] count = new int [7];for(int i=0; i<100000; i++){count[random(3, 6)]++;}for(int i=1; i<7; i++){System.out.println("count["+i+"] = "+count[i]);}}}