listgradestrans.java

来自「国外的数据结构与算法分析用书」· Java 代码 · 共 27 行

package Transactions;

import Sets.StudentSet;
import dslib.list.LinkedListUos;
import Entities.*;

/**	List the grades obtained so far for a student */
public class ListGradesTrans
{

	public LinkedListUos gradeList;
	
	public void execute(Student user)
	{
		gradeList = user.gradeList;
	}
	
	public void executeReg(int studNum)
	{
		Student student = (Student)StudentSet.rep.obtain(new Integer(studNum));
		if (student != null)
			execute(student);
		else
			gradeList = new LinkedListUos();
	}
		
} /* end of ListGradesTrans */