for(int i=0;i<3;i++){

????System.out.println("Choose your courseID:");

????String courseID = input.next();

????for(Courses cr:ssc.coursesSelect){

????? ? //if(cr.getId()==courseID.toString()){ //為什么這樣比較返回false？

????????if(cr.getId().equals(courseID)){

????????????System.out.println("Success!");

????????}

????}

}