public static void main(String[] args) {

// TODO Auto-generated method stub

SetTest si= new SetTest();

si.testAdd();

si.testForEach();

//創建一個學生對象

Student student=new Student("1","小華");

System.out.println("歡迎學生"+student.name+"來選課");

? ? ? }

執行到這一步Student student=new Student("1","小華");他對Student報錯，說Student cannot be resolved to a type意思就是學生不能分解成一種類型。為什么視頻里老師的就不會報錯我改怎么解決