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");
 }
}