内部类

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成员内部类：

package twohomework;

public class chengyuan {
    public static void main(String[] args) {
        chengyuan.teacher.student stu = new chengyuan().new teacher().new student();
        stu.getTeacherInfro();
        chengyuan.teacher tea = new chengyuan().new teacher();


    }
    class teacher{
        String name = "张三";
        Integer age = 18;
        public class student{
            public void getTeacherInfro(){
                System.out.println("老师的姓名是" + name);
                System.out.println("老师的年龄是" + age);
            }
        }
    }
}

注：我看网上很多的代码都是直接创建的外部类的对象，从而引用的内部类，而我试了，不行，我的外部类只能通过创建类对象来访问，我感觉没什么问题，学的时候就是这么学的，反之网上的那种点一次的没有跑通

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静态内部类：

package twohomework;

public class jingtai {
    public static void main(String[] args) {
        Teacher.Student student = new Teacher.Student();
        student.getTeacherInfro();
    }

    public static class Teacher{
        static String name = "张三";
        static Integer age = 18;
        static class Student{
            public void getTeacherInfro(){
                System.out.println("老师的姓名是" + name);
                System.out.println("老师的年龄是" + age);
            }
        }
    }
}

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方法内部类：

package twohomework;

public class method {
    public static void main(String[] args) {
        method.Teacher teacher = new method().new Teacher();
        teacher.show();
    }

    public class Teacher{
        public String name = "张三";
        public Integer age = 18;
        public void show(){
            class Student{
                public void getTeacherInfro(){
                    System.out.println("老师的姓名是" + name);
                    System.out.println("老师的年龄是" + age);
                }
            }
            Student student = new Student();
            student.getTeacherInfro();
        }
    }
}