为什么我不能通过学生集合进行迭代？请帮忙。谢谢

问题描述

ArrayList<studentinfo> students = new ArrayList<studentinfo>();

	        StudentInfo student = new StudentInfo();
	        //1
	        student.studentName = "Justin Lazaro";
	        students.add(student);
	        student.barrowedBooks = ("English, Math");
	        //add to list

	        //2	
	        student = new StudentInfo();
	        student.studentName = "Gian Acuna";
	        student.barrowedBooks = "Math";
	        students.add(student);
	        //etc.

	        //further...
	        // use for(...) loop
	        // to iterate through the collection of student

	        Iterator itr = student.iterator();
	        while (itr.hasNext()){
	        	System.out.println(itr.next());
	        }

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