我的程序在一次迭代后脱离了第一个 for 循环

Question

这是我的代码。它向用户询问术语和定义，然后对用户进行测验。 （它告诉用户术语，然后用户键入答案。）程序使用数组来存储术语和定义。如果用户没有得到正确的定义，程序会询问用户是否想再次研究它。如果是这样，他们将输入 yes，程序会将其存储在单独的数组中。在程序对用户进行所有术语和定义的测验后，第 2 轮开始，程序将仅对用户进行加星定义的测验。问题是，代码只运行一次 for 循环（在第 1 轮对用户进行测验），然后跳到第 2 轮。为什么会这样？我已经尝试查看其他人的问题和答案，但我似乎无法在我的代码中找到问题。

import java.util.*;

public class Ptcreate {
    public static void main(String[] args) {
        String term;
        String definition;
        Scanner userInput = new Scanner(System.in);
        System.out.println("How many terms would you like to study?");
        int number_terms = userInput.nextInt();
        String[] term_array = new String[number_terms];
        String[] def_array = new String[number_terms];
        String[] star_array = new String[number_terms];
        String[] stardef_array = new String[number_terms];
        System.out.println("Now, enter the " + number_terms + " terms now.");
        for (int i = 0; i < number_terms; i++) {
            term_array[i] = userInput.next();
        }
        System.out.println(
                "Now, enter all the definitions, in the correct order such that it matches the order of the terms you entered.");
        for (int i = 0; i < number_terms; i++) {
            def_array[i] = userInput.next();
        }
        System.out.println("Ok. Now for the testing!");
        for (int i = 0; i <= number_terms; i++) { // the for loop that isn't
                                                  // working.
            System.out.println("What is definition " + (i + 1));
            String answer = userInput.next();
            if (answer.equals(def_array[i])) {
                System.out.println("Correct");
                star_array[i] = "null";
                stardef_array[i] = "null";
            } else if (!answer.equals(def_array[i])) {
                do {
                    System.out.println("Incorrect.");
                    System.out.println("Would you like to study this term again? Type y or n.");
                    String bool = userInput.next();
                    if (bool.equals("y")) {
                        star_array[i] = term_array[i];
                        stardef_array[i] = def_array[i];
                    } else if (bool.equals("n")) {
                        star_array[i] = "null";
                        stardef_array[i] = "null";
                    }
                    System.out.println("What is the definition " + (i + 1));
                    answer = userInput.next();
                } while (!answer.equals(def_array[i]));
                if (answer.equals(def_array[i])) {
                    System.out.println(
                            "Correct"); /*
                                         * when the user finally enters the
                                         * right definition, the program skips
                                         * to the code below
                                         */
                }
            }
            System.out.println("Now, time for testing definitions you starred!");
            for (int z = 0; z < number_terms; z++) {
                if (star_array[z].equals("null")) {
                    break;
                } else {
                    System.out.println("What is the definition of " + star_array[z] + " ?");
                    String star_answer = userInput.next();
                    if (star_answer.equals(stardef_array[z])) {
                        System.out.println("Correct.");
                    } else if (!star_answer.equals(stardef_array[z])) {
                        do {
                            System.out.println("Incorrect. Please try again.");
                            System.out.println("What is the definition of " + star_array[z] + " ?");
                            star_answer = userInput.next();
                        } while (!star_answer.equals(stardef_array[z]));
                    }
                }
            }
        }
    }
}

Answer 1

for (int i = 0; i <= number_terms; i++)

您有 number_terms + 1 次迭代。替换为

for (int i = 0; i < number_terms; i++)

Answer 2

错误是您用注释“for loop that is not working”标记的for循环没有循环遍历所有定义。这个 for 循环在处理第一个定义后继续处理第 2 轮，而不是继续循环到第 2 个定义，依此类推。该修复要求您将此 for 循环的右括号放在打印语句“现在，测试您加星标的定义的时间！”之前。如下所示。我在下面代码中向上移动的 for-loop 右括号中添加了注释“结束 for-loop 以确保循环所有定义”。此外，这个 for 循环的迭代条件应该是 'i

import java.util.*;

public class Ptcreate {
  public static void main(String[] args) {
    String term;
    String definition;
    Scanner userInput = new Scanner(System.in);
    System.out.println("How many terms would you like to study?");
    int number_terms = userInput.nextInt();
    String[] term_array = new String[number_terms];
    String[] def_array = new String[number_terms];
    String[] star_array = new String[number_terms];
    String[] stardef_array = new String[number_terms];
    System.out.println("Now, enter the " + number_terms + " terms now.");
    for (int i = 0; i < number_terms; i++) {
        term_array[i] = userInput.next();
    }
    System.out.println(
            "Now, enter all the definitions, in the correct order such " +
            "that it matches the order of the terms you entered.");
    for (int i = 0; i < number_terms; i++) {
        def_array[i] = userInput.next();
    }
    System.out.println("Ok. Now for the testing!");
    for (int i = 0; i < number_terms; i++) { // the for loop that isn't
                                              // working.
        System.out.println("What is definition " + (i + 1));
        String answer = userInput.next();
        if (answer.equals(def_array[i])) {
            System.out.println("Correct");
            star_array[i] = "null";
            stardef_array[i] = "null";
        } else if (!answer.equals(def_array[i])) {
            do {
                System.out.println("Incorrect.");
                System.out.println("Would you like to study this term again? Type y or n.");
                String bool = userInput.next();
                if (bool.equals("y")) {
                    star_array[i] = term_array[i];
                    stardef_array[i] = def_array[i];
                } else if (bool.equals("n")) {
                    star_array[i] = "null";
                    stardef_array[i] = "null";
                }
                System.out.println("What is the definition " + (i + 1));
                answer = userInput.next();
            } while (!answer.equals(def_array[i]));
            if (answer.equals(def_array[i])) {
                System.out.println(
                        "Correct"); /*
                                     * when the user finally enters the
                                     * right definition, the program skips
                                     * to the code below
                                     */
            }
        }
    } // end for-loop to ensure looping of all definitions
        System.out.println("Now, time for testing definitions you starred!");
        for (int z = 0; z < number_terms; z++) {
            if (star_array[z].equals("null")) {
                break;
            } else {
                System.out.println("What is the definition of " + star_array[z] + " ?");
                String star_answer = userInput.next();
                if (star_answer.equals(stardef_array[z])) {
                    System.out.println("Correct.");
                } else if (!star_answer.equals(stardef_array[z])) {
                    do {
                        System.out.println("Incorrect. Please try again.");
                        System.out.println("What is the definition of " + star_array[z] + " ?");
                        star_answer = userInput.next();
                    } while (!star_answer.equals(stardef_array[z]));
                }
            }
        }
    }
}