Java 课程设计_学生选课管理系统

package StuPickCouse_Dos; import StuPickCouse_Dos.PickCouse.Couse; import StuPickCouse_Dos.PickCouse.User; import StuPickCouse_Dos.PickMysql.CouseSql; import StuPickCouse_Dos.PickMysql.UserSql; import java.util.ArrayList; import java.util.Scanner; public class Operator { User user; CouseSql couseSql; UserSql userSql; ArrayList<Couse> couses = new ArrayList<>(); public void setUser(User user) { this.user = user; } public Operator(){} public Operator(User user) { this.user = user; couseSql=new CouseSql(user); userSql=new UserSql(); } public void findAllCouse(){ couses = couseSql.findCouse("select * from Subject"); for (int i = 0; i < couses.size(); i++) System.out.println((i + 1) + " " + couses.get(i).toString()); } public void selectCouse(){ System.out.println("所有课程如下："); ArrayList<Couse> couseICanChose=new ArrayList<>(); ArrayList<String> couseICanChoseId=new ArrayList<>(); for (int i = 0; i < couses.size(); i++){ System.out.print((i + 1) + " " + couses.get(i).toString()); boolean tag=false,flage=false; System.out.println( ( tag= ( ( !(flage=couseSql.isMyCouse("select * from PickCouse where stuId="+user.getId()+" and couseId="+couses.get(i).getId() ) )&& Integer.parseInt( couses.get(i).getCapacity() ) >= Integer.parseInt( couses.get(i).getNum() ) ) ) )? " 可选": flage?" 已选":" 人员已满"); if(tag) { couseICanChose.add(couses.get(i)); couseICanChoseId.add(couses.get(i).getId()); } } if(couseICanChose.size() < 1) System.out.print("暂时没有可选的课程！"); else { System.out.println("====》可选课程有："); for (int i = 0; i < couseICanChose.size(); i++) System.out.println((i + 1) + " " + couseICanChose.get(i).toString()); System.out.print("====>请输入选择的课程编号："); String couse = ""; while(!couseICanChoseId.contains( couse = (new Scanner(System.in)).nextLine())) System.out.print("输入不在选择范围，请重新输入："); couseSql.chioseCouse(new Couse(couse)); } } public void findMyCouse(){ shoeArrayList(couseSql.findCouse("select * from Subject where subjectId in (select couseId from PickCouse where stuId="+user.getId()+")")); } public static void shoeArrayList(ArrayList<Couse> item){ for (int i = 0; i < item.size(); i++) System.out.println((i + 1) + " " + item.get(i).toString()); System.out.print("Tip: 按任意键继续："); (new Scanner(System.in)).next(); } public boolean intoPwd(String pwd,String id){ int inputTimes=2; while( !( userSql.findUser(id).equals((new Scanner(System.in)).nextLine()) )&&inputTimes>0) System.out.print("！[第"+(3-inputTimes)+"次输入]-密码输入错误：剩余输入机会"+(inputTimes--)+"\n请重新输入："); return inputTimes>=0; } public int show(){ System.out.println("*****************************************"); System.out.println("*****************************************"); System.out.println("******** 1)查看课程信息 **************"); System.out.println("******** 2)选课 *************"); System.out.println("******** 3)查看个人选课 *************"); System.out.println("*****************************************"); System.out.print("请输入选择："); return (new Scanner(System.in)).nextInt(); } }