下列代码的运行结果是一定是整齐的么?为什么？ 1.classs Test{ void test(){ synchronized(this){ for(int i=0;i<10;i++){ Sytem.out.print(i); } } } } class MyThread extends Thread{ private Test t; void setTest(Test t){ this.t=t; } public void run(){ t.test(); } } 主方法中: Test t=new Test(); MyThread myThread1=new MyThread(); MyThread myThread2=new MyThread(); myThread1.setTest(t); myThread2.setTest(t) myThread1.start(); myThread2.start();

不一定。该代码中创建了一个Test对象t，并通过两个MyThread对象myThread1和myThread2来调用它的test()方法。

由于test()方法中使用了synchronized关键字，表示该方法在同一时间只能被一个线程访问。因此，当myThread1和myThread2同时运行时，它们会尝试同时访问共享的Test对象t，但由于synchronized的限制，只有一个线程可以进入test()方法并执行其中的代码。

具体来说，当myThread1线程先获取t对象的锁并进入test()方法执行for循环时，它将打印出0到9的数字。然后，当myThread2线程尝试获取t对象的锁并进入test()方法时，它会被阻塞，直到myThread1释放t对象的锁。

因此，输出结果的整齐与否取决于两个线程获取锁的顺序以及它们执行test()方法的时间间隔。如果myThread1先获取锁并执行完毕，然后myThread2才获取锁并执行，那么输出结果将是整齐的。但如果两个线程交替获取锁并执行，输出结果可能会变得混乱。

相关问题

python+selenium classs元素定位

在使用 Python 的 Selenium 库进行元素定位时，可以创建一个类来管理定位相关的操作。下面是一个示例代码：

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC

class ElementLocator:
    def __init__(self, driver):
        self.driver = driver
    
    def find_element_by_id(self, element_id):
        return self.driver.find_element(By.ID, element_id)
    
    def find_element_by_xpath(self, xpath):
        return self.driver.find_element(By.XPATH, xpath)
    
    def wait_for_element_visible(self, locator, timeout=10):
        return WebDriverWait(self.driver, timeout).until(EC.visibility_of_element_located(locator))
    
    # 可以添加其他常用的元素定位方法，比如 find_element_by_css_selector、find_element_by_class_name 等等

# 示例用法
driver = webdriver.Chrome()
element_locator = ElementLocator(driver)

element = element_locator.find_element_by_id("element_id")
element.click()

visible_element = element_locator.wait_for_element_visible((By.XPATH, "//div[@class='my-element']"))

在上面的示例代码中，我们创建了一个名为 `ElementLocator` 的类，它接收一个 Selenium WebDriver 对象作为参数，并提供了一些常用的元素定位方法，比如 `find_element_by_id` 和 `find_element_by_xpath`。此外，还添加了一个 `wait_for_element_visible` 方法，用于等待元素可见。

你可以根据自己的需要扩展 `ElementLocator` 类，添加其他常用的元素定位方法，以便于在测试或爬虫等场景中使用。

根据上述问题和要求，用C++编写完整代码

好的，以下是一个简单的 C++ 实现，仅供参考。

#include <iostream>
#include <string>
#include <vector>
using namespace std;

// 本科生节点
struct Undergraduate {
    string name;    // 姓名
    string classs;  // 班级
};

// 研究生节点
struct Graduate {
    string name;    // 姓名
    string classs;  // 班级
    vector<Undergraduate> undergraduates;    // 本科生列表
};

// 导师节点
struct Teacher {
    string name;    // 姓名
    string title;   // 职称
    vector<Graduate> graduates; // 研究生列表
    vector<Undergraduate> undergraduates;    // 本科生列表
};

// 导师广义表
vector<Teacher> teacherList;

// 查找导师节点
int findTeacher(string name) {
    for (int i = 0; i < teacherList.size(); i++) {
        if (teacherList[i].name == name) {
            return i;
        }
    }
    return -1;
}

// 插入本科生节点
bool insertUndergraduate(string teacherName, Undergraduate undergraduate) {
    int index = findTeacher(teacherName);
    if (index != -1) {
        teacherList[index].undergraduates.push_back(undergraduate);
        return true;
    }
    return false;
}

// 插入研究生节点
bool insertGraduate(string teacherName, string graduateName, Graduate graduate) {
    int index = findTeacher(teacherName);
    if (index != -1) {
        for (int i = 0; i < teacherList[index].graduates.size(); i++) {
            if (teacherList[index].graduates[i].name == graduateName) {
                teacherList[index].graduates[i].undergraduates.push_back(graduate.undergraduates[0]);
                return true;
            }
        }
        graduate.undergraduates.clear();
        teacherList[index].graduates.push_back(graduate);
        return true;
    }
    return false;
}

// 删除本科生节点
bool deleteUndergraduate(string teacherName, string undergraduateName) {
    int index = findTeacher(teacherName);
    if (index != -1) {
        for (int i = 0; i < teacherList[index].undergraduates.size(); i++) {
            if (teacherList[index].undergraduates[i].name == undergraduateName) {
                teacherList[index].undergraduates.erase(teacherList[index].undergraduates.begin() + i);
                return true;
            }
        }
    }
    return false;
}

// 删除研究生节点
bool deleteGraduate(string teacherName, string graduateName) {
    int index = findTeacher(teacherName);
    if (index != -1) {
        for (int i = 0; i < teacherList[index].graduates.size(); i++) {
            if (teacherList[index].graduates[i].name == graduateName) {
                teacherList[index].graduates.erase(teacherList[index].graduates.begin() + i);
                return true;
            }
        }
    }
    return false;
}

// 查询导师信息
void queryTeacher(string teacherName) {
    int index = findTeacher(teacherName);
    if (index != -1) {
        cout << "姓名：" << teacherList[index].name << endl;
        cout << "职称：" << teacherList[index].title << endl;
    }
}

// 查询本科生信息
void queryUndergraduate(string teacherName, string undergraduateName) {
    int index = findTeacher(teacherName);
    if (index != -1) {
        for (int i = 0; i < teacherList[index].undergraduates.size(); i++) {
            if (teacherList[index].undergraduates[i].name == undergraduateName) {
                cout << "姓名：" << teacherList[index].undergraduates[i].name << endl;
                cout << "班级：" << teacherList[index].undergraduates[i].classs << endl;
            }
        }
    }
}

// 查询研究生信息
void queryGraduate(string teacherName, string graduateName) {
    int index = findTeacher(teacherName);
    if (index != -1) {
        for (int i = 0; i < teacherList[index].graduates.size(); i++) {
            if (teacherList[index].graduates[i].name == graduateName) {
                cout << "姓名：" << teacherList[index].graduates[i].name << endl;
                cout << "班级：" << teacherList[index].graduates[i].classs << endl;
            }
        }
    }
}

// 统计研究生和本科生数量
void countStudent(string teacherName) {
    int index = findTeacher(teacherName);
    if (index != -1) {
        int graduateCount = teacherList[index].graduates.size();
        int undergraduateCount = teacherList[index].undergraduates.size();
        cout << "研究生数量：" << graduateCount << endl;
        cout << "本科生数量：" << undergraduateCount << endl;
    }
}

// 打印导师的学生列表
void printStudent(string teacherName) {
    int index = findTeacher(teacherName);
    if (index != -1) {
        cout << "研究生列表：" << endl;
        for (int i = 0; i < teacherList[index].graduates.size(); i++) {
            cout << "    姓名：" << teacherList[index].graduates[i].name << endl;
            cout << "    班级：" << teacherList[index].graduates[i].classs << endl;
            cout << "    本科生列表：" << endl;
            for (int j = 0; j < teacherList[index].graduates[i].undergraduates.size(); j++) {
                cout << "        姓名：" << teacherList[index].graduates[i].undergraduates[j].name << endl;
                cout << "        班级：" << teacherList[index].graduates[i].undergraduates[j].classs << endl;
            }
        }
        cout << "本科生列表：" << endl;
        for (int i = 0; i < teacherList[index].undergraduates.size(); i++) {
            cout << "    姓名：" << teacherList[index].undergraduates[i].name << endl;
            cout << "    班级：" << teacherList[index].undergraduates[i].classs << endl;
        }
    }
}

// 主函数
int main() {
    while (true) {
        int choice;
        cout << "请选择操作：" << endl;
        cout << "1. 建立导师广义表" << endl;
        cout << "2. 插入本科生节点" << endl;
        cout << "3. 插入研究生节点" << endl;
        cout << "4. 删除本科生节点" << endl;
        cout << "5. 删除研究生节点" << endl;
        cout << "6. 查询导师信息" << endl;
        cout << "7. 查询本科生信息" << endl;
        cout << "8. 查询研究生信息" << endl;
        cout << "9. 统计研究生和本科生数量" << endl;
        cout << "10. 打印导师的学生列表" << endl;
        cout << "11. 退出程序" << endl;
        cin >> choice;
        if (choice == 1) {
            Teacher teacher;
            cout << "请输入导师姓名：";
            cin >> teacher.name;
            cout << "请输入导师职称：";
            cin >> teacher.title;
            teacherList.push_back(teacher);
        }
        else if (choice == 2) {
            string teacherName;
            Undergraduate undergraduate;
            cout << "请输入导师姓名：";
            cin >> teacherName;
            cout << "请输入本科生姓名：";
            cin >> undergraduate.name;
            cout << "请输入本科生班级：";
            cin >> undergraduate.classs;
            if (!insertUndergraduate(teacherName, undergraduate)) {
                cout << "导师不存在！" << endl;
            }
        }
        else if (choice == 3) {
            string teacherName, graduateName;
            Graduate graduate;
            cout << "请输入导师姓名：";
            cin >> teacherName;
            cout << "请输入研究生姓名：";
            cin >> graduateName;
            cout << "请输入研究生班级：";
            cin >> graduate.classs;
            cout << "请输入本科生姓名：";
            cin >> graduate.undergraduates[0].name;
            cout << "请输入本科生班级：";
            cin >> graduate.undergraduates[0].classs;
            if (!insertGraduate(teacherName, graduateName, graduate)) {
                cout << "导师不存在！" << endl;
            }
        }
        else if (choice == 4) {
            string teacherName, undergraduateName;
            cout << "请输入导师姓名：";
            cin >> teacherName;
            cout << "请输入本科生姓名：";
            cin >> undergraduateName;
            if (!deleteUndergraduate(teacherName, undergraduateName)) {
                cout << "导师或本科生不存在！" << endl;
            }
        }
        else if (choice == 5) {
            string teacherName, graduateName;
            cout << "请输入导师姓名：";
            cin >> teacherName;
            cout << "请输入研究生姓名：";
            cin >> graduateName;
            if (!deleteGraduate(teacherName, graduateName)) {
                cout << "导师或研究生不存在！" << endl;
            }
        }
        else if (choice == 6) {
            string teacherName;
            cout << "请输入导师姓名：";
            cin >> teacherName;
            queryTeacher(teacherName);
        }
        else if (choice == 7) {
            string teacherName, undergraduateName;
            cout << "请输入导师姓名：";
            cin >> teacherName;
            cout << "请输入本科生姓名：";
            cin >> undergraduateName;
            queryUndergraduate(teacherName, undergraduateName);
        }
        else if (choice == 8) {
            string teacherName, graduateName;
            cout << "请输入导师姓名：";
            cin >> teacherName;
            cout << "请输入研究生姓名：";
            cin >> graduateName;
            queryGraduate(teacherName, graduateName);
        }
        else if (choice == 9) {
            string teacherName;
            cout << "请输入导师姓名：";
            cin >> teacherName;
            countStudent(teacherName);
        }
        else if (choice == 10) {
            string teacherName;
            cout << "请输入导师姓名