测试

src/JuniorTea.java

@@ -1,5 +1,11 @@
 package src;
 
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardOpenOption;
+import java.io.IOException;
+import java.util.Random;
+
 public class JuniorTea extends Teacher{
     public JuniorTea(String name, String password) {
         super(name, password);
@@ -7,7 +13,62 @@ public class JuniorTea extends Teacher{
 
     @Override
     public String GenerateEX(int num, int type){
-        return null;
+        // 生成题目存储路径
+        Path filePath = Paths.get(super.generatePath());
+
+        Random random = new Random();
+        String[] operators = {"+", "-", "*", "/", "^2", "√"};
+
+        for(int i=0; i<num; i++){
+            int operandCount = random.nextInt(4) + 2;
+            StringBuilder question = new StringBuilder();
+
+            int[] operands = new int[operandCount];
+            for(int j=0; j<operandCount; j++){
+                operands[j] = random.nextInt(100) + 1;
+            }
+                
+            // 随机决定是否以及在哪里加括号 (对于3个以上操作数)
+            boolean useParentheses = operandCount > 2 && random.nextBoolean();
+            int parenStartIndex = 0;
+            if (useParentheses) {
+                parenStartIndex = random.nextInt(operandCount - 2);
+            }
+
+            for (int j = 0; j < operandCount; j++) {
+                if (useParentheses && j == parenStartIndex) {
+                    question.append("(");
+                }
+                question.append(operands[j]);
+                if (useParentheses && j == parenStartIndex + 1) {
+                    question.append(")");
+                }
+
+                if(j < operandCount - 1){
+                    String op = operators[random.nextInt(operators.length)];
+
+                    // 避免除以0
+                    if (op == "/" && operands[j+1] == 0) {
+                        operands[j+1] = random.nextInt(100) + 1;
+                    }
+
+                    question.append(" " + op + " " );
+                }
+            }
+            String qstr = "(" + (i+1) + ")" + question.toString() + " =\n";
+            // 题目查重
+            if(super.checkDuplicate(qstr)){
+                i--;
+                continue;
+            }
+            // 写入文档
+            try {
+                java.nio.file.Files.writeString(filePath, qstr, StandardOpenOption.APPEND);
+            } catch (IOException e){
+                e.printStackTrace();
+            }
+        }
+        return filePath.toString();
     }
 
     @Override

src/Main.java

@@ -5,8 +5,10 @@ import java.util.ArrayList;
 import java.util.HashMap;
 
 public class Main {
-    static ArrayList<Teacher> teachers;      // 用户列表
-    static Teacher teacher;                  // 当前用户
+    // 用户列表
+    static ArrayList<Teacher> teachers;
+    // 当前用户
+    static Teacher teacher;                  
     static HashMap<String, Integer> typeMap;
     public static void main(String[] args) {
         final int LEAST_NUM = 10, MAX_NUM = 30;
@@ -30,7 +32,8 @@ public class Main {
         Scanner scanner = new Scanner(System.in, "GBK");
         while(true){
             boolean flag = false;
-            while(!flag){                                    // 登录界面
+            // 登录界面
+            while(!flag){                                    
                 System.out.println("-------请登录您的账户-------");
                 System.out.println("    请输入: 用户名 密码     ");
                 String cur = scanner.nextLine();
@@ -55,7 +58,8 @@ public class Main {
                 }
             }
 
-            int type = typeMap.get(teacher.getType()); // 当前出题类型，默认值为当前用户类型
+            // 当前出题类型，默认值为当前用户类型
+            int type = typeMap.get(teacher.getType()); 
             boolean logout = false;
             while(!logout){
                 System.out.println("-------是否切换出题类型(y/n)-------");
@@ -78,16 +82,17 @@ public class Main {
                     System.out.println("请继续输入题目数量：");
                 }
                 int num = scanner.nextInt();
-                scanner.nextLine(); // 吸收换行符
+                scanner.nextLine();
                 while(true){
                     try{
                         if(num == -1){
+                            // 返回到登录界面
                             System.out.println("已退出登录");
                             logout = true;
-                            break; // 返回到登录界面
+                            break; 
                         }
                         if(num >= LEAST_NUM && num <= MAX_NUM){
-                            String filepath = teacher.GenerateEX(num, type); // 生成题目
+                            String filepath = teacher.GenerateEX(num, type);
                             System.out.println("题目生成成功，已保存至" + filepath);
                             break;
                         }

src/PrimaryTea.java

@@ -14,8 +14,7 @@ public class PrimaryTea extends Teacher{
     @Override
     public String GenerateEX(int num, int type){
         // 生成题目存储路径
-        String curPath = super.generatePath();
-        Path filepath = Paths.get(curPath);
+        Path filePath = Paths.get(super.generatePath());
 
         Random random = new Random();
         char[] operators = {'+', '-', '*', '/'};
@@ -47,14 +46,19 @@ public class PrimaryTea extends Teacher{
 
                 if (j < operandCount - 1) {
                     char op = operators[random.nextInt(operators.length)];
-                    
-                    // 避免除以0
-                    if (op == '/' && operands[j+1] != 0 && operands[j] % operands[j+1] != 0) {
-                        // 对于小学生，更倾向于可整除的除法
-                        operands[j] = operands[j+1] * (random.nextInt(10) + 1);
+
+                    // 处理除法--避免除以0 & 保证可整除
+                    if (op == '/') {
+                        if(operands[j+1] == 0) {
+                            operands[j+1] = random.nextInt(100) + 1;
+                        }
+                        if(operands[j] % operands[j+1] != 0) {
+                            operands[j+1] = random.nextInt(10) + 1;
+                            operands[j] = operands[j+1] * (random.nextInt(10) + 1);
+                        }
                     }
 
-                    // 避免小学生不熟悉的负数结果
+                    // 避免负数结果
                     if (op == '-' && operands[j] < operands[j+1]) {
                         int temp = operands[j];
                         operands[j] = operands[j+1];
@@ -69,18 +73,19 @@ public class PrimaryTea extends Teacher{
                 }
             }
             String qstr = "(" + (i + 1) + ") " + question.toString() + " =\n";
-            if(super.checkDuplicate(qstr)){ // 题目查重
+            // 题目查重
+            if(super.checkDuplicate(qstr)){
                 i--;
                 continue;
             }
             // 写入文档
             try {
-                java.nio.file.Files.writeString(filepath, qstr, StandardOpenOption.APPEND);
+                java.nio.file.Files.writeString(filePath, qstr, StandardOpenOption.APPEND);
             } catch (IOException e){
                 e.printStackTrace();
             }
         }
-        return filepath.toString();
+        return filePath.toString();
     }
 
     @Override

src/Teacher.java

@@ -2,18 +2,22 @@ package src;
 
 import java.io.File;
 import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.List;
 import java.text.SimpleDateFormat;
 import java.util.Date;
 
 abstract class Teacher {
     String name;
     String password;
-    String path = null;
+    String path = null; // 教师文件夹路径
 
     public Teacher(String name, String password) {
         this.name = name;
         this.password = password;
-        File folder = new File(name); // 生成文件夹
+        // 生成文件夹
+        File folder = new File(name);
         try{
             if(!folder.exists()){
                 folder.mkdirs();
@@ -26,6 +30,22 @@ abstract class Teacher {
 
     // 查重
     public boolean checkDuplicate(String question){
+        File folder = new File(this.path);
+        File[] files = folder.listFiles();
+        if(files == null) return false;
+        for(File file : files){
+            List<String> lines = null;
+            try {
+                lines = Files.readAllLines(Paths.get(file.getAbsolutePath()));
+                for(String line : lines){
+                    if(line.substring(3).equals(question)){
+                        return true;
+                    }
+                }
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
         return false;
     }