新增复杂OOP测试文件，包含Student、Course和University类的定义及对象创建、字段访问和对象集合测试，验证多类交互的功能，进一步增强面向对象编程的支持。

Author: HelloAIXIAOJI

test_oop_complex.cn

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+using lib <io>;
+
+// 复杂OOP测试 - 多类交互
+class Student {
+    public name : string;
+    public studentId : string;
+    private grades : string;
+    
+    constructor(name : string, studentId : string) {
+        this.name = name;
+        this.studentId = studentId;
+        this.grades = "";
+    };
+    
+    public fn getName() : string {
+        return this.name;
+    };
+    
+    public fn getStudentId() : string {
+        return this.studentId;
+    };
+    
+    public fn getInfo() : string {
+        return "Student: " + this.name + " (ID: " + this.studentId + ")";
+    };
+};
+
+class Course {
+    public courseName : string;
+    public courseCode : string;
+    private instructor : string;
+    
+    constructor(courseName : string, courseCode : string, instructor : string) {
+        this.courseName = courseName;
+        this.courseCode = courseCode;
+        this.instructor = instructor;
+    };
+    
+    public fn getCourseName() : string {
+        return this.courseName;
+    };
+    
+    public fn getCourseCode() : string {
+        return this.courseCode;
+    };
+    
+    public fn getInstructor() : string {
+        return this.instructor;
+    };
+    
+    public fn getCourseInfo() : string {
+        return this.courseCode + ": " + this.courseName;
+    };
+};
+
+class University {
+    public name : string;
+    public location : string;
+    
+    constructor(name : string, location : string) {
+        this.name = name;
+        this.location = location;
+    };
+    
+    public fn getName() : string {
+        return this.name;
+    };
+    
+    public fn getLocation() : string {
+        return this.location;
+    };
+    
+    public fn getUniversityInfo() : string {
+        return this.name + " (" + this.location + ")";
+    };
+};
+
+fn main() : int {
+    std::println("=== CodeNothing OOP 复杂测试 ===");
+    
+    // 创建大学
+    std::println("1. 创建大学对象");
+    university : University = new University("MIT", "Cambridge, MA");
+    std::println("University: " + university.getUniversityInfo());
+    std::println("✅ 大学对象创建成功");
+    
+    // 创建课程
+    std::println("2. 创建课程对象");
+    course1 : Course = new Course("Computer Science", "CS101", "Dr. Smith");
+    course2 : Course = new Course("Mathematics", "MATH201", "Prof. Johnson");
+    std::println("Course1: " + course1.getCourseInfo());
+    std::println("Course2: " + course2.getCourseInfo());
+    std::println("✅ 课程对象创建成功");
+    
+    // 创建学生
+    std::println("3. 创建学生对象");
+    student1 : Student = new Student("Alice Johnson", "S001");
+    student2 : Student = new Student("Bob Smith", "S002");
+    student3 : Student = new Student("Charlie Brown", "S003");
+    std::println("Student1: " + student1.getInfo());
+    std::println("Student2: " + student2.getInfo());
+    std::println("Student3: " + student3.getInfo());
+    std::println("✅ 学生对象创建成功");
+    
+    // 测试对象集合
+    std::println("4. 测试对象集合");
+    std::println("学生1: " + student1.name);
+    std::println("学生2: " + student2.name);
+    std::println("学生3: " + student3.name);
+    std::println("✅ 对象集合测试成功");
+    
+    // 测试字段访问
+    std::println("5. 测试字段访问");
+    std::println("第一个学生姓名: " + student1.name);
+    std::println("第一个课程名称: " + course1.courseName);
+    std::println("✅ 字段访问测试成功");
+    
+    std::println("=== 复杂OOP测试完成 ===");
+    std::println("🎉 所有OOP功能测试通过！");
+    return 0;
+};