Write a simple examination program to complete the interaction of questions and answers on the console. Questions are divided into single choice and multi choice.

Write a simple test program , Complete the problem in the console 、 Interaction of answer questions . test questions (Question) Divided into single choice (SingleChoice) And multiple choice ( MultiChoice) Two kinds of . among , Single choice questions and multiple-choice questions inherit the test questions , As shown in the figure below .

requirement :

1) stay MultiChoice The implementation parameters in the class are ( String text, String[] options, char[] answers) Construction method of . stay SingleChoice Implementation parameters are ( String text, String[] options ,char answer) Construction method of .

2) stay MutiChie and SingleChoice Class Question class chek0 Method , Realize the verification answer method of multiple topics and the verification answer method of single topic respectively .

3) Design test class for examination 、 Answer the questions .

for example , Initialize the following questions ：

new MultiQuestion(" Who are the three wonders in the romance of the Three Kingdoms ?",new String[]{"A. Cao Cao ","B. Liu bei ","C. Guan yu ","D. Zhugeliang "},new char[]{'A','C',D''});

new SingleQuestion(" Who first recommended Zhuge Liang to Liu Bei ?",new String[]{"A. Xu Shu ","B. Sima Wei ","C. Lu Su ","D. Guan yu "},'B');

The running effect of the exam is as follows :

Who are the three wonders in the romance of the Three Kingdoms ?

A. Cao Cao      B. Liu bei      C. Guan yu       D. Zhugeliang

Please select :cad

Congratulations , bingo !

Who first recommended Zhuge Liang to Liu Bei ?

A. Xu Shu      B. Sima Wei     C. Lu Su     D. Guan yu

Please select :A

We have to work hard

explain :

1) When the user enters an answer , Case should support . Tips : You can use Character. toUpperCase() Method converts the answer characters entered by the user into uppercase characters, and then compares them ( The standard answer is capital letters ).

2) When judging whether a single choice question is right or wrong , If the user does not answer the question , Or there are more options than 1 Both are considered to be wrong .

3) When judging the correctness of multiple-choice questions , If the user does not answer the question , More options or less than standard answers , Or wrong choices are regarded as wrong answers ( Multiple choice answers need to be entered continuously , There must be no spaces between options 、 Enter and other characters ).

4) Multiple choice questions allow users to enter answers in different order from standard answers , That is, as long as all options are selected correctly .

Tips ： You can use Arrays. binarySearch() Method to query whether there is a user's option in the answer array .

 

import java.util.Scanner;
import java.util.Arrays;

abstract class Question {
    String text;
    String[] options = new String[4];

    Question() {
    }

    Question(String text, String[] options) {
        this.text = text;
        this.options = options;
    }

    abstract boolean check(char[] answers);

    void print() {
        System.out.println(text);
        System.out.println(options[0] + " " + options[1] + " " + options[2] + " " + options[3]);
        System.out.println(" Please choose the right option according to the question :");
    }
}

class SingleQuestion extends Question {
    char answer;

    SingleQuestion(String text, String[] options, char answer) {
        this.text = text;
        this.options = options;
        this.answer = answer;
    }

    boolean check(char[] answer) {
        if (answer.length == 1) {
            if (Character.toUpperCase(answer[0]) == this.answer)
                return true;
            else
                return false;
        } else
            return false;
    }
}

class MultiQuestion extends Question {
    char[] answer = new char[4];

    MultiQuestion(String text, String[] options, char[] answer) {
        this.text = text;
        this.options = options;
        this.answer = answer;
    }

    boolean check(char[] answer) {
        int count = 0;
        for (int i = 0; i < answer.length; i++) {
            int x = Arrays.binarySearch(this.answer, Character.toUpperCase(answer[i]));
            if (x < 0)
                return false;
            else
                count++;
        }
        if (count == 3)
            return true;
        else
            return false;
    }
}



public class Test{
    public static void main(String[] args) {
        SingleQuestion s = new SingleQuestion(" Who first recommended Zhuge Liang to Liu Bei ？", new String[] { "A. Xu Shu ", "B. Sima Wei ", "C. Lu Su ", "D. Guan yu " }, 'A');
        MultiQuestion m = new MultiQuestion(" Who are the three wonders in the romance of the Three Kingdoms ？", new String[] { "A. Cao Cao ", "B. Liu bei ", "C. Guan yu ", "D. Zhugeliang " }, new char[] { 'A', 'C', 'D' });
        m.print();
        Scanner sc1 = new Scanner(System.in);
        String t1 = null;
        t1 = sc1.nextLine();
        char[] a = t1.toCharArray();
        if (m.check(a))
        
            System.out.println(" Congratulations , bingo ！");
        else
            System.out.println(" We have to work hard ！");
        s.print();
        Scanner sc2 = new Scanner(System.in);
        String t2 = null;
        t2 = sc2.nextLine();
        char[] b = t2.toCharArray();
        if (s.check(b))
            System.out.println(" Congratulations , bingo ！");
        else
            System.out.println(" We have to work hard ！");
    }
}