import java.util.Scanner;
public class AdditionQuiz {
public static void main(String[] args){
int number1 = (int)(System.currentTimeMillis()%10);
int number2 = (int)(System.currentTimeMillis()*7%10);
System.out.println("What is "+number1+"+"+number2+"?");
Scanner input = new Scanner(System.in);
int answer = input.nextInt();
System.out.println(number1+"+"+number2+"="+answer+" is "+(number1+number2==answer));

}
}
产生随机数的方法有很多，现在使用System.currentTimeMillis()方法产生随机数。(number1+number2==answer)的结果是一个布尔值：true或false.