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  1. import java.util.ArrayList;
  2. import java.util.Iterator;
  3. import java.util.List;
  4. import java.util.Random;
  5.  
  6. public class Main {
  7.  
  8.     private static final int NUMBER_OF_QUESTIONS = 10;
  9.     private static final int MIN_QUESTION_ELEMENTS = 2;
  10.     private static final int MAX_QUESTION_ELEMENTS = 4;
  11.     private static final int MIN_QUESTION_ELEMENT_VALUE = 1;
  12.     private static final int MAX_QUESTION_ELEMENT_VALUE = 100;
  13.     private final Random randomGenerator = new Random();
  14.  
  15.     public static void main(String[] args) {
  16.         Main questionGenerator = new Main();
  17.         List<Question> randomQuestions = questionGenerator.getGeneratedRandomQuestions();
  18.         for (Question question : randomQuestions) {
  19.             System.out.println(question);
  20.         }
  21.     }
  22.  
  23.     public List<Question> getGeneratedRandomQuestions() {
  24.         List<Question> randomQuestions = new ArrayList<Question>(NUMBER_OF_QUESTIONS);
  25.         for (int i = 0; i < NUMBER_OF_QUESTIONS; i++) {
  26.             int randomQuestionElementsCapacity = getRandomQuestionElementsCapacity();
  27.             Question question = new Question(randomQuestionElementsCapacity);
  28.             for (int j = 0; j < randomQuestionElementsCapacity; j++) {
  29.                 boolean isLastIteration = j + 1 == randomQuestionElementsCapacity;
  30.  
  31.                 QuestionElement questionElement = new QuestionElement();
  32.                 questionElement.setValue(getRandomQuestionElementValue());
  33.                 questionElement.setOperator(isLastIteration ? null
  34.                         : Operator.values()[randomGenerator.nextInt(Operator.values().length)]);
  35.  
  36.                 question.addElement(questionElement);
  37.             }
  38.             randomQuestions.add(question);
  39.         }
  40.         return randomQuestions;
  41.     }
  42.  
  43.     private int getRandomQuestionElementsCapacity() {
  44.         return getRandomIntegerFromRange(MIN_QUESTION_ELEMENTS, MAX_QUESTION_ELEMENTS);
  45.     }
  46.  
  47.     private int getRandomQuestionElementValue() {
  48.         return getRandomIntegerFromRange(MIN_QUESTION_ELEMENT_VALUE, MAX_QUESTION_ELEMENT_VALUE);
  49.     }
  50.  
  51.     private int getRandomIntegerFromRange(int min, int max) {
  52.         return randomGenerator.nextInt(max - min + 1) + min;
  53.     }
  54. }
  55.  
  56. class Question {
  57.  
  58.     private List<QuestionElement> questionElements;
  59.  
  60.     public Question(int sizeOfQuestionElemets) {
  61.         questionElements = new ArrayList<QuestionElement>(sizeOfQuestionElemets);
  62.     }
  63.  
  64.     public void addElement(QuestionElement questionElement) {
  65.         questionElements.add(questionElement);
  66.     }
  67.  
  68.     public List<QuestionElement> getElements() {
  69.         return questionElements;
  70.     }
  71.  
  72.     public int size() {
  73.         return questionElements.size();
  74.     }
  75.  
  76.     @Override
  77.     public String toString() {
  78.         StringBuilder sb = new StringBuilder();
  79.         for (QuestionElement questionElement : questionElements) {
  80.             sb.append(questionElement);
  81.         }
  82.         return sb.toString().trim();
  83.     }
  84. }
  85.  
  86. class QuestionElement {
  87.  
  88.     private int value;
  89.     private Operator operator;
  90.  
  91.     public int getValue() {
  92.         return value;
  93.     }
  94.  
  95.     public void setValue(int value) {
  96.         this.value = value;
  97.     }
  98.  
  99.     public Operator getOperator() {
  100.         return operator;
  101.     }
  102.  
  103.     public void setOperator(Operator operator) {
  104.         this.operator = operator;
  105.     }
  106.  
  107.     @Override
  108.     public String toString() {
  109.         return value + (operator == null ? "" : " " + operator.getDisplayValue()) + " ";
  110.     }
  111. }
  112.  
  113. enum Operator {
  114.  
  115.     PLUS("+"), MINUS("-"), MULTIPLIER("*"), DIVIDER("/");
  116.     private String displayValue;
  117.  
  118.     private Operator(String displayValue) {
  119.         this.displayValue = displayValue;
  120.     }
  121.  
  122.     public String getDisplayValue() {
  123.         return displayValue;
  124.     }
  125. }
Success #stdin #stdout 0.08s 213440KB
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stdin
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Standard input is empty
stdout
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88 + 27 - 37
95 / 66 - 41 / 61
66 - 69 / 10 - 67
10 * 7 + 20 / 97
79 - 31 / 72 + 28
3 - 78 / 76
19 + 42 + 5 * 70
65 / 56 + 19 / 56
89 - 28 / 50 + 46
85 - 16 * 3 * 75
https://ideone.com/OG39x
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
public

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