public static void deleteStudent(ArrayList<Student> list){
System.out.println("删除学生");
Scanner sc=new Scanner(System.in);
System.out.println("请输入要删除得学生id");
String id=sc.next();
int index=getIndex(list,id);
if(index>=0){
list.remove(index);
System.out.println("id为"+id+"的删除成功");
}else {
System.out.println("删除的id不存在");
}
}