20以内的加减法辅导

package homeWork;
import java.util.Scanner;

/** 
 * @author LIUJUN
 *@ 20181117
 */

public class homeWork1 {
    public static void main (String []args){
        System.out.println("\t\t\t xxx的家庭作业");
        Initialization.Initialization();
    }
}
  class Initialization{
/**
 * 初始化，主要功能选择练习类型和题量
 * 调用计算方法，完成计算
 */
  static void Initialization(){//初始化
      System.out.print("\t请输入要练习的类型（+:1/-:2）?:");
        Scanner input1 =new Scanner(System.in);
        int type = input1.nextInt();
        if (type == 1 || type == 2){
            System.out.print("\t请输入要练习的题数:");
            Scanner input2 =new Scanner(System.in);
            int num = input2.nextInt();
        
            for(int i = 1;i <= num;i++){
                //随机获取2个整数，且第一个数为2位数
                int num1 = (int)(System.currentTimeMillis() % 10);
                int num2 = (int)(System.currentTimeMillis() * 7 % 10);
                num1 += 10;
            
                if (type == 1)
                    add(num1,num2);
                else 
                    minus(num1,num2);
                }
            System.out.println("\t\t太棒了，你完成了所有的练习，下次继续努力");
        }
        else 
            System.out.println("\t\t输入不对，练习结束");
   }
  
  static void add(int a,int b){  //加法器
      System.out.print("请你计算:\t"+a+"+"+b+"=");
      Scanner input = new Scanner(System.in);
      int answer = input.nextInt();
      System.out.println(a+"+"+b+"="+answer+"\t"+(a+b==answer));
 }

static void minus(int a,int b){//减法器
     System.out.print("请你计算:\t"+a+"-"+b+"=");
     Scanner input =new Scanner(System.in);
     int answer = input.nextInt();
     System.out.println(a+"-"+b+"="+answer+"\t"+(a-b==answer));
     
 }

}