编译报错求解答。

package com.imooc.collection;

import java.util.HashSet;
import java.util.Set;

/**
 * 学生类
 * @author 鹏
 *
 */
public class Student {
 public String id;
 public String name;
 //定义一个存放选择的课程的集合
 public Set<String> Courses;
 //定义一个构造器来传入id,name和Course
 public Student(String id,String name){
  this.id=id;
  this.name=name;
  this.Courses=new HashSet<String>();//将选择的课程集合实例化
 }

}

2.

package com.imooc.collection;

/**
 * 课程类
 * @author 鹏
 *
 */
public class Course {
 //定义两哥公用的Course的属性
 public String id;
 public String name;
 //创建一个构造器，令我们输入的id+name传入Course里面
 public Course(String id,String name){
  this.id=id;
  this.name=name;
 }
 public Course(){
  
 }

}

3.

package com.imooc.collection;

public class ChildCourse extends Course {

}

4.

package com.imooc.collection;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class SetText {
 
 public List<Course> coursesToselect;
 
 public SetText(){
  coursesToselect =new ArrayList<Course>();
 }
 
 public void add(){
  Course cr1 = new Course("1","程序设计基础");
  coursesToselect.add(cr1);
  Course cr2 = new Course("2","计算机网络");
  coursesToselect.add(cr2);
  Course cr3 = new Course("3","数据结构");
  coursesToselect.add(cr3);
  Course cr4 = new Course("4","高数");
  coursesToselect.add(cr4);
  Course cr5 = new Course("5","线代");
  coursesToselect.add(cr5);
  Course cr6 = new Course("6","概率论与数理统计");
  coursesToselect.add(cr6);
  Course cr7 = new Course("7","大学英语");
  coursesToselect.add(cr7);
  Course cr8 = new Course("8","马原");
  coursesToselect.add(cr8);
 }
 
 public void ForEach(){
  for (Course course : coursesToselect) {
   System.out.println("课程："+course.id+":"+course.name);
  }
 }
 
 public static void main(String[] args) {
  // TODO 自动生成的方法存根
  Student student = new Student("1","小明");
  System.out.println("欢迎"+student.name+"同学来选课");
  System.out.println("\n可以被选择的课程有：");
  SetText H = new SetText();
  H.add();
  H.ForEach();
  Scanner in=new Scanner(System.in);
  for(int i = 0;i<3;i++){
   System.out.println("请输入课程的ID：");
   String courseid = in.next();
   for (Course cr : H.coursesToselect) {
    if(cr.id.equals(courseid)){
     student.Courses.add(cr);
    }
   }
  }
  

 }
 
 public void TextForEach(Student student){
  for (Course cr : student.Courses) {
   System.out.println("选择了课程："+cr.id+":"+cr.name);
  }
 }

}