为什么运行后说我类型强制转换异常？
package com.imooc;
import java.util.ArrayList;
import java.util.List;
public class Courseselect {
public List selectCourse;
public Courseselect(){
this.selectCourse =new ArrayList();
}
public void test(){
Course cr1=new Course("1","西游记");
selectCourse.add("cr1");
Course temp=(Course)selectCourse.get(0);
System.out.println("已添加课程："+temp.id+":"+temp.name);
}
public static void main(String[] args){
Courseselect i=new Courseselect();
i.test();
}
}没发现哪里有错
