java实现题目以及选项乱序的方法实例

import java.util.Map;

/**

  * 单选题

  */

public class ChoiceQuestion {

  private String name;     // 题目

  private Map<String, String> option; // 选项；A、B、C、D

  private String key;     // 答案；B

  public ChoiceQuestion() {

  }

  public ChoiceQuestion(String name, Map<String, String> option, String key) {

   this .name = name;

   this .option = option;

   this .key = key;

  }

  public String getName() {

   return name;

  }

  public void setName(String name) {

   this .name = name;

  }

  public Map<String, String> getOption() {

   return option;

  }

  public void setOption(Map<String, String> option) {

   this .option = option;

  }

  public String getKey() {

   return key;

  }

  public void setKey(String key) {

   this .key = key;

  }

}

public class Topic {

  private Map<String, String> option; // 选项；A、B、C、D

  private String key;   // 答案；B

  public Topic() {

  }

  public Topic(Map<String, String> option, String key) {

   this .option = option;

   this .key = key;

  }

  public Map<String, String> getOption() {

   return option;

  }

  public void setOption(Map<String, String> option) {

   this .option = option;

  }

  public String getKey() {

   return key;

  }

  public void setKey(String key) {

   this .key = key;

  }

}

/**

  * @date 2021/3/3 16:54

  * @version: 1.0

  */

public class QuestionTest {

  /**

   * 输出对于考生的题目

   * @param candidate

   * @param number

   */

  public static void output(String candidate, String number){

   Map<String, String> map01 = new HashMap<String, String>();

   map01.put( "A" , "JAVA2 EE" );

   map01.put( "B" , "JAVA2 Card" );

   map01.put( "C" , "JAVA2 ME" );

   map01.put( "D" , "JAVA2 HE" );

   map01.put( "E" , "JAVA2 SE" );

   Map<String, String> map02 = new HashMap<String, String>();

   map02.put( "A" , "JAVA程序的main方法必须写在类里面" );

   map02.put( "B" , "JAVA程序中可以有多个main方法" );

   map02.put( "C" , "JAVA程序中类名必须与文件名一样" );

   map02.put( "D" , "JAVA程序的main方法中如果只有一条语句，可以不用{}(大括号)括起来" );

   Map<String, String> map03 = new HashMap<String, String>();

   map03.put( "A" , "变量由字母、下划线、数字、$符号随意组成；" );

   map03.put( "B" , "变量不能以数字作为开头；" );

   map03.put( "C" , "A和a在java中是同一个变量；" );

   map03.put( "D" , "不同类型的变量，可以起相同的名字；" );

   Map<String, String> map04 = new HashMap<String, String>();

   map04.put( "A" , "STRING" );

   map04.put( "B" , "x3x;" );

   map04.put( "C" , "void" );

   map04.put( "D" , "de$f" );

   Map<String, String> map05 = new HashMap<String, String>();

   map05.put( "A" , "31" );

   map05.put( "B" , "0" );

   map05.put( "C" , "1" );

   map05.put( "D" , "2" );

   ArrayList<ChoiceQuestion> choiceQuestionList = new ArrayList<ChoiceQuestion>();

   choiceQuestionList.add( new ChoiceQuestion( "JAVA所定义的版本中不包括" , map01, "D" ));

   choiceQuestionList.add( new ChoiceQuestion( "下列说法正确的是" , map02, "A" ));

   choiceQuestionList.add( new ChoiceQuestion( "以下()不是合法的标识符" ,map04, "C" ));

   choiceQuestionList.add( new ChoiceQuestion( "表达式(11+3*8)/4%3的值是" , map05, "D" ));

   choiceQuestionList.add( new ChoiceQuestion( "变量命名规范说法正确的是" , map03, "B" ));

   //题目顺序打乱

   Collections.shuffle(choiceQuestionList);

   // 选项-答案乱序

   for (ChoiceQuestion question : choiceQuestionList) {

    Topic random = random(question.getOption(), question.getKey());

    question.setOption(random.getOption());

    question.setKey(random.getKey());

   }

   //输出打印

   System.out.println(toString(choiceQuestionList, candidate, number));

  }

  /**

   * 打乱选项和答案

   * @param option

   * @param key

   * @return

   */

  public static Topic random(Map<String, String> option, String key) {

   Set<String> keySet = option.keySet();

   ArrayList<String> keyList = new ArrayList<String>(keySet);

   Collections.shuffle(keyList);

   HashMap<String, String> optionNew = new HashMap<String, String>();

   int idx = 0 ;

   String keyNew = "" ;

   for (String next : keySet) {

    String randomKey = keyList.get(idx++);

    if (key.equals(next)) {

     keyNew = randomKey;

    }

    optionNew.put(randomKey, option.get(next));

   }

   return new Topic(optionNew, keyNew);

  }

  public static String toString(ArrayList<ChoiceQuestion> choiceQuestionList,String candidate, String number) {

   StringBuilder detail = new StringBuilder( "考生：" + candidate + "\r\n" +

     "考号：" + number + "\r\n" +

     "--------------------------------------------\r\n" +

     "一、选择题" + "\r\n\n" );

   for ( int idx = 0 ; idx < choiceQuestionList.size(); idx++) {

    detail.append( "第" ).append(idx + 1 ).append( "题：" ).append(choiceQuestionList.get(idx).getName()).append( "\r\n" );

    Map<String, String> option = choiceQuestionList.get(idx).getOption();

    for (String key : option.keySet()) {

     detail.append(key).append( "：" ).append(option.get(key)).append( "\r\n" );;

    }

    detail.append( "答案：" ).append(choiceQuestionList.get(idx).getKey()).append( "\r\n\n" );

   }

   return detail.toString();

  }

  public static void main(String[] args) {

   output( "花花" , "1000001921032" );

   output( "豆豆" , "1000001921051" );

   output( "大宝" , "1000001921987" );

  }

}