/// <summary>

    /// model

    /// </summary>

    public class Student

    {

        public string Name;

        public int Age;

    }

        /// 方法:

        /// <summary>

        /// 错误示范

        /// 

        /// student这个引用是拷贝传入的，创建新的对应Student 

        /// 把引用赋给student，当方法退栈之后student引用回到压栈前

        /// 则Student对象引用数为0，等待GC，引用student依旧是原来的值(逻辑地址)

        /// </summary>

        /// <param name="student"></param>

        static void createStudent(Student student)

        {

            student = new Student { Name ="Stephen Lee", Age = 1};

        }

        /// <summary>

        /// 正确做法

        /// 

        /// 通过ref关键字，把操作权让给方法内部

        /// </summary>

        /// <param name="student"></param>

        static void createStudent(ref Student student)

        {

            student = new Student { Name = "Stephen Lee", Age = 1 };

        }

        // Client

        static void Main(string[] args)

        {

            Console.WriteLine("错误示范");

            Student student1 = null;

            createStudent(student1);

            if (student1 == null)

                Console.WriteLine("创建对象失败");

            else

                Console.WriteLine("创建对象成功,Name:" + student1.Name);

            Console.WriteLine("正确做法");

            Student student2 = null;

            createStudent(ref student2);

            if (student2 == null)

                Console.WriteLine("创建对象失败");

            else

                Console.WriteLine("创建对象成功,Name:" + student2.Name);

        }

/** Model

 * @author Stephen

 *

 */

public class Student

{

    public String Name;

    public int Age;

    public Student(String name,int age)

    {

        this.Name = name;

        this.Age = age;

    }

}

    /** 错误示范,原因同C#

     * @param student

     */

    private void createStudent(Student student)

    {

        student = new Student("Stephen Lee",1);

    }

    /** 正确做法

     * @param studentPack

     */

    private void createStudent(StudentPack studentPack)

    {

        studentPack.student = new Student("Stephen Lee",1);

    }

    /** 包装器

     * @author Stephen

     *

     */

    public class StudentPack

    {

        public Student student;

    }

        // Client

        StudentPack studentPack = new StudentPack();

        createStudent(studentPack);

        System.out.println(studentPack.student.Name);