Java实现随机出题，10道10以内加减法计算

package com.swift;

import java.awt.Toolkit;

import java.util.Scanner;

public class PlusQuiz {

    public static void main(String[] args) {

        int i=0;

        int number1=0,number2=0;

        for(;;) {

            number1=(int) (Math.random()*10);

            number2=(int) (Math.random()*10);

            //加法部分

            System.out.println("What is "+number1+"+"+number2+"?");

            Scanner scan=new Scanner(System.in);

            int answer=scan.nextInt();

            if(answer==number1+number2) {

                System.out.println("√");

                Toolkit.getDefaultToolkit().beep();

                //System.out.println('\007');

            }else {

                System.out.println("×");

                System.out.println(number1+"+"+number2+" should be "+(number1+number2));

            }

            //减法部分

            if(number1<number2) {

                int temp;

                temp=number1;

                number1=number2;

                number2=temp;

            }

            System.out.println("What is "+number1+"-"+number2+"?");

            int answer2=scan.nextInt();

            if(answer2==number1-number2) {

                System.out.println("√");

                for(int time=0;time<6;time++)

                Toolkit.getDefaultToolkit().beep();

            }else {

                System.out.println("×");

                System.out.println(number1+"-"+number2+" should be "+(number1-number2));

            }

            //判断加减法完成次数

            i++;

            if(i==5) {

                break;

            }

        }

    }

}