1、类名作为方法的形参

    方法的形参是类名，其实需要的是该类的对象

    1.       实际传递的是该对象的【地址值】
    1. public class Teacher{
    2.     private String name;
    3.     private int age;
    4.      public void method(Student stu){
    5.         stu.study();
    6.     }
    7. }
    8. public class Student{
    9.     private String name;
    10.     private inr age;
    11.     public void study(){}
    12. }
    13. public class Test(){
    14.     public static void main(String[] args){
    15.         Teacher teacher = new Teacher();
    16.         Student stu = new Student();
    17.         teacher.method(stu)
    18.     }
    19. }

    2、类名作为方法的返回值

    1.       方法的返回值是类名，其实返回的是该类的对象
    3.       实际传递的，也是该对象的【地址值】
    1. public class Student{
    2.     private String name;
    3.     private int age;
    4.     public void study(){
    5.         ....
    6.     }
    7. }
    8. public class Teacher{
    9.     private String name;
    10.     private int age;
    11.        public Student getStudent(){
    12.         Student stu = new Student();
    13.         return stu;
    14.     }
    15. }
    16. public class Test{
    17.     public static void main(String[] args){
    18.         Teacher teacher = new Teacher();
    19.         Student stu = teacher.getStudent();
    20.         stu.study();
    21.     }
    22. }