Java 3.2(游戏：三个数的加法)程序清单3-1中的程序产生两个整数，并提示用户输入这两个整数的和。修改该程序使之能产生3个一位整数，然后提示用户输入这3个整数的和。

程序3-1

假设开发一个程序，让一年级的小朋友练习加法运算。程序随机产生两个一位整数：number1和number2，然后显示“What is 1 + 7”，如程序清单3-1运行示例。当学生在对话框中输入答案之后，程序显示一个消息，表明答案是真的还是假的。

程序3清单-1

package Chapter_03;

import java.util.Scanner;

public class Code_2 {

public static void main(String[] args) {
int number1 = (int)(System.currentTimeMillis() % 10);
int number2 = (int)(System.currentTimeMillis() / 7 % 10);
Scanner input = new Scanner(System.in);
System.out.print("What is "+ number1 + " + " + number2 + " ?");
int answer = input.nextInt();
System.out.print(number1 + " + " + number2 + " = " + answer + " is " + (number1 + number2 == answer));
	}

}

程序调试：

What is 6 + 5 ?7
6 + 5 = 7 is false

 本题3.2程序清单：

package Chapter_03;

import java.util.Scanner;

public class Code_2 {

public static void main(String[] args) {
int number1 = (int)(System.currentTimeMillis() % 10);
int number2 = (int)(System.currentTimeMillis() / 7 % 10);
int number3 = (int)(System.currentTimeMillis() / 3 % 10);
Scanner input = new Scanner(System.in);
System.out.print("What is "+ number1 + " + " + number2 + " + " + number3 + " ?");
   int answer = input.nextInt();
   System.out.print(number1 + " + " + number2 + " + " + number3 + " = " + answer + " is " + (number1 + number2 + number3 == answer));
	}

}

 程序调试

What is 1 + 8 + 3 ?7
1 + 8 + 3 = 7 is false