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2024-07-05 15:22| 来源: 网络整理| 查看: 265

学生的类，有学生的性别，籍贯，姓名和五门课程的成绩，用private进行封装，同时写出getter和setter方法

package com.zheng.people; public class Student { private String name; private String jiguan; private String number;//学生学号 private String gender;//性别 private String classname;//学生班级 private int age;// private double english;//英语成鸡 private double math;//数学成绩 private double cscore;//c语言成绩 private double javascore;//java成绩 private double PE;//体育成绩 private double total;//总成绩 private double avergae;//平均成绩 public Student(){ } public String getJiguan() { return jiguan; } public double getAvergae() { return avergae; } public void setAvergae(double avergae) { this.avergae = avergae; } public double getTotal() { return total; } public void setTotal(double total) { this.total = total; } public void setJiguan(String jiguan) { this.jiguan = jiguan; } public String getName() { return name; } public Student(String name,String number,String gender,String classname,int age,double english,double math,double cscore,double javascore,double PE,double avergae,double total){ this.age=age; this.classname=classname; this.gender=gender; this.number=number; this.name=name; this.cscore=cscore; this.english=english; this.javascore=javascore; this.PE=PE; this.math=math; this.avergae=avergae; this.total=total; } public void setName(String name) { this.name = name; } public String getNumber() { return number; } public String getGender() { return gender; } public void setGender(String gender) { this.gender = gender; } public void setNumber(String number) { this.number=number; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getClassname() { return classname; } public void setClassname(String classname) { this.classname = classname; } public double getPE() { return PE; } public void setPE(double PE) { this.PE = PE; } public double getJavascore() { return javascore; } public void setJavascore(double javascore) { this.javascore = javascore; } public double getCscore() { return cscore; } public void setCscore(double cscore) { this.cscore = cscore; } public double getMath() { return math; } public void setMath(double math) { this.math = math; } public double getEnglish() { return english; } public void setEnglish(double english) { this.english = english; } @Override public String toString() { return "Student{" + "name='" + name + '\'' + ", jiguan='" + jiguan + '\'' + ", number='" + number + '\'' + ", gender='" + gender + '\'' + ", classname='" + classname + '\'' + ", age=" + age + ", english=" + english + ", math=" + math + ", cscore=" + cscore + ", javascore=" + javascore + ", PE=" + PE + ", total=" + total + ", avergae=" + avergae + '}'; } }

coust类提示操作成功和失败！

package com.zheng.util; public class COUST { public static final String SUCCESS="操作成功"; public static final String ERROR="操作失败"; }

Result类

package com.zheng.util; import com.sun.org.apache.regexp.internal.RE; import java.sql.ResultSet; import java.util.HashMap; import java.util.Map; public class Result { private int code; private String message; private Map data=new HashMap(); public Result() { } public Result(int code, String message, Map data) { this.code = code; this.message = message; this.data = data; } public int getCode() { return code; } public void setCode(int code) { this.code = code; } public String getMessage() { return message; } public void setMessage(String message) { this.message = message; } public Map getData() { return data; } public void setData(Map data) { this.data = data; } @Override public String toString() { return "Result{" + "code=" + code + ", message='" + message + '\'' + ", data=" + data + '}'; } public static Result ok(){ Result r=new Result(); r.setCode(ResultCode.SUCCESS); r.setMessage(COUST.SUCCESS); return r; } public static Result error(){ Result r=new Result(); r.setCode(ResultCode.ERROR); r.setMessage(COUST.ERROR); return r; } public Result message(String message){ this.setMessage(message); return this; } public Result code(Integer code){ this.setCode(code); return this; } public Result data(String key,Object value){ this.data.put(key,value); return this; } public Result data(Map map){ this.setData(map); return this; } }

ResultCode类

package com.zheng.util; public class ResultCode { public static Integer SUCCESS=200; public static Integer ERROR=201; }

StudnetUtils类，采用随机数法模拟班级成员，但这样会使班级成员分数较低，仅仅是模拟

package com.zheng.util; import com.zheng.people.Student; import java.util.ArrayList; import java.util.List; import java.util.Random;//采用随机数发给随机的学生赋值； public class StudentUtils { public static List studentList(){ List students=new ArrayList(); for (int i = 0; i 5?"陕西":"河南"); s.setNumber("2109124000"+i); s.setGender(i>5?"男":"女"); s.setClassname("计算机2101班"); s.setAge(18); double english= r.nextDouble()*100; s.setEnglish(english); double math=r.nextDouble()*100; s.setMath(math); double PE=r.nextDouble()*100; s.setPE(PE); double java=r.nextDouble()*100; s.setJavascore(java); double c=r.nextDouble()*100; s.setCscore(c); s.setTotal(english+math+PE+java+c); s.setAvergae((english+math+PE+java+c)/5); students.add(s); } return students; } }

StudentInterface类创建学生的接口（比较草率的写了，应该在写查找和修改的）

package com.zheng.service; import com.zheng.people.Student; import com.zheng.util.Result; import java.util.List; public interface StudentInterface { /** * 增加一个学生 * * @param stu * @param list * @return */ public static Result addStudent(Student stu, List list) { return null; } /** * 这个方法是删除一个学生 * @param stu * @param list * @return */ public Result deleteStudent(Student stu, List list); //修改学生。查询学生 }

Studentcaozuo类，重写接口的方法add，delete，search和recover（修改）的方法有一个问题，在修改学生的成绩后怎么样把单位学生的总体成绩和平均成绩修改？？？（修改单个成绩后，total成绩应该有变动）

package com.zheng.service; import com.zheng.people.Student; import com.zheng.service.StudentInterface; import com.zheng.util.Result; import java.util.List; import java.util.Scanner; public class Studentcaozuo implements StudentInterface { public static Result addStudent(Student stu, List list) { list.add(stu); return Result.ok().data("studentList", list); } public Result deleteStudent(Student stu, List list) { for (Student student : list) { if (stu.getName().equals(student.getName())) { list.remove(student); return Result.ok(); } } return Result.error(); } public Result searchStudent(Student stu, List StudentProject) { for(Student student02:StudentProject) { if(stu.getName().equals(student02.getName())) System.out.println("查到的结构为"+student02); return Result.ok(); } Result.error(); return null; } public Result recover(Student stu,String need, List StudentProject) { for(Student s03:StudentProject) if(stu.getName().equals(s03.getName())) switch (need) { case"姓名": System.out.print("请输入姓名"); Scanner Q = new Scanner(System.in); String name; name = Q.next(); s03.setName(name);break; case"籍贯": System.out.print("请输入籍贯"); Scanner W = new Scanner(System.in); String jiguan; jiguan = W.next(); s03.setJiguan(jiguan);break; case"学号": System.out.print("请输入学生学号"); Scanner E = new Scanner(System.in); String number; number = E.next(); s03.setNumber(number);break; case"性别": System.out.print("请输入性别"); Scanner R = new Scanner(System.in); String gender; gender = R.next(); s03.setGender(gender);break; case"班级": System.out.print("请输入学生班级"); Scanner T = new Scanner(System.in); String Classname; Classname = T.next(); s03.setClassname(Classname);break; case"年龄": System.out.print("请输入学生年龄"); Scanner Y = new Scanner(System.in); int age; age = Y.nextInt(); s03.setAge(age);break; case"英语成绩": System.out.print("请输入英语成绩"); Scanner U = new Scanner(System.in); double English; English = U.nextDouble(); s03.setEnglish(English);break; case"数学成绩": System.out.print("请输入数学成绩"); Scanner I = new Scanner(System.in); double Math; Math = I.nextDouble(); s03.setMath(Math);break; case"c语言成绩": System.out.print("请输入c语言成绩"); Scanner O = new Scanner(System.in); double C; C = O.nextDouble(); s03.setCscore(C);break; case"java成绩": System.out.print("请输入java成绩"); Scanner P = new Scanner(System.in); double Java; Java = P.nextDouble(); s03.setJavascore(Java);break; case"体育成绩": System.out.print("请输入体育成绩"); Scanner A = new Scanner(System.in); double PE; PE = A.nextDouble(); s03.setPE(PE); ;break; default: System.out.println("输入错误"); } return null; }}

测试类如下

package com.zheng.Text; import com.zheng.people.Student; import com.zheng.service.Studentcaozuo; import com.zheng.util.Result; import com.zheng.util.StudentUtils; import java.util.ArrayList; import java.util.List; import java.util.Scanner; public class StudentText { public static void main(String[] args) { Scanner n = new Scanner(System.in); List list = new ArrayList(); list = StudentUtils.studentList();//这个list已经赋值了，随机数法模拟班级成绩（班级成绩很低） Studentcaozuo studentservice = new Studentcaozuo(); Result Result; int choice=0; while(true) { System.out.println("请输入操作数"); System.out.println("【1】增加学生"); System.out.println("【2】删除学生"); System.out.println("【3】修改学生"); System.out.println("【4】查找学生"); System.out.println("【5】显示所有学生"); System.out.println("【6】平均成绩及格的学生"); choice = n.nextInt(); switch (choice) { case 1: System.out.println("添加学生"); Student s01 = new Student(); System.out.print("请输入姓名"); Scanner q = new Scanner(System.in); String name; name = q.next(); s01.setName(name); System.out.print("请输入籍贯"); Scanner w = new Scanner(System.in); String jiguan; jiguan = w.next(); s01.setJiguan(jiguan); System.out.print("请输入学生学号"); Scanner e = new Scanner(System.in); String number; number = w.next(); s01.setNumber(number); System.out.print("请输入性别"); Scanner r = new Scanner(System.in); String gender; gender = r.next(); s01.setGender(gender); System.out.print("请输入学生班级"); Scanner t = new Scanner(System.in); String Classname; Classname = t.next(); s01.setClassname(Classname); System.out.print("请输入学生年龄"); Scanner y = new Scanner(System.in); int age; age = y.nextInt(); s01.setAge(age); System.out.print("请输入英语成绩"); Scanner u = new Scanner(System.in); double english; english = u.nextDouble(); s01.setEnglish(english); System.out.print("请输入数学成绩"); Scanner i = new Scanner(System.in); double math; math = i.nextDouble(); s01.setMath(math); System.out.print("请输入c语言成绩"); Scanner o = new Scanner(System.in); double c; c = o.nextDouble(); s01.setCscore(c); System.out.print("请输入java成绩"); Scanner p = new Scanner(System.in); double java; java = p.nextDouble(); s01.setJavascore(java); System.out.print("请输入体育成绩"); Scanner a = new Scanner(System.in); double PE; PE = a.nextDouble(); s01.setPE(PE); s01.setTotal(PE + java + c + math + english); s01.setAvergae((PE + java + c + math + english) / 5); Result=studentservice.addStudent(s01,list); System.out.println("新的学生已经添加！"); break; case 2:System.out.print("删除学生信息："); Student s02=new Student(); String name02; System.out.print("请输入想删除的学生姓名"); name02=n.next(); s02.setName(name02); Result=studentservice.deleteStudent(s02,list);break; case 3: System.out.print("修改学生信息:"); Student s03=new Student(); System.out.print("请输入要修改学生的姓名:"); String name03; name03=n.next(); s03.setName(name03); System.out.print("请输入需要修改的信息类型:"); String need; need =n.next(); studentservice.recover(s03,need,list);break; case 4: System.out.println("查找学生信息"); Student s04 = new Student(); System.out.print("请输入学生的姓名："); String name04 = n.next(); s04.setName(name04); studentservice.searchStudent(s04,list); break; case 5: if (list.size() == 0) { System.out.print("表内还没有学生"); } else { System.out.println("展示班级所有学生"); for (int count = 0; count

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