dropcoursetrans.java

来自「国外的数据结构与算法分析用书」· Java 代码 · 共 25 行

package Transactions;

import Sets.*;
import Entities.*;

/*	Allow the user (a student) to drop a course */
public class DropCourseTrans
{
	
	public void execute(CallNum callN, Student user)
	{
		user.dropCourse(callN);
		CourseSection droppedSection = DepartmentSet.getCourseSection(callN);
		if (droppedSection != null)
			droppedSection.decrementEnrollment();
	}

	public void executeReg(CallNum callN, int studNum)
	{
		Student student = (Student)StudentSet.rep.obtain(new Integer(studNum));
		if (student != null)
			execute(callN, student);
	}
	
} /* end of DropCourseTrans */