10.15

package cty;
import java.util.Scanner;
public class Test 
　　{
    public static void main(String[] args) 
　　　　{
        int A = (int) (System.currentTimeMillis() % 10);                 
        int B = (int) (System.currentTimeMillis() / 7 % 10);             
        System.out.println(A + "  .   " + B);
        Scanner scan = new Scanner(System.in);
        System.out.println("what is" + A + "+" + B + "?");
        int answer = scan.nextInt();
        System.out.printlnA + "+"+B + "=" + answer + "is"+ (A + B == answer));
        //System.out.println(System.currentTimeMillis());
    　　}
　　}

10.15

原文：http://www.cnblogs.com/Archon-Cty/p/7676229.html