【Java程序设计】学生成绩管理系统 |
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【Java程序设计】学生成绩管理系统
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相关文章： 【Java程序设计】宠物商店管理系统【Java程序设计】Java基础知识实验 对于学生成绩管理系统，主要可以分为如下几个功能： 录入学生成绩统计学生成绩查找学生成绩修改学生成绩删除学生成绩按平均分排序显示所有成绩退出管理系统进入系统之后，我们应该有系统菜单，然后根据提示选择我们所要进行的操作。
（1）录入学生成绩 该功能是每次录入学生的成绩信息，或者在当前数据的基础上添加录入新的学生成绩信息；
核心代码： //录入学生信息 public void addScore(ArrayList students) { System.out.println("----------录入学生数据----------"); System.out.println("请依次输入如下数据："); long id; while (true) { System.out.println("学号"); id = scanner.nextInt(); if (isValid(students, id)) { System.out.println("学号重复，请重新输入"); } else { break; } } System.out.println("年级"); String grade = scanner.next(); System.out.println("姓名"); String name = scanner.next(); System.out.println("数学"); float math = scanner.nextFloat(); System.out.println("英语"); float english = scanner.nextFloat(); System.out.println("体育"); float sport = scanner.nextFloat(); System.out.println("Java"); float java = scanner.nextFloat(); System.out.println("C++"); float cPlusPlus = scanner.nextFloat(); System.out.println("政治"); float polity = scanner.nextFloat(); System.out.println("算法"); float algorithm = scanner.nextFloat(); // 创建对象，并设置属性，然后将其加入学生对象集合 Student student = new Student(); student.setId(id); student.setGrade(grade); student.setName(name); student.setMath(math); student.setAlgorithm(algorithm); student.setEnglish(english); student.setcPlusPlus(cPlusPlus); student.setJava(java); student.setSport(sport); student.setPolity(polity); // 获取平均分 double avg = getAvg(student); student.setAverage(avg); // 添加到集合 students.add(student); // 提示信息 System.out.println("添加成功"); }（2）统计学生成绩 主要是对学生的成绩进行统计，然后输出平均分，并打印出对应信息；
核心代码： //显示简单统计数据 public void showAvg(ArrayList students) { System.out.println("----------输出学生统计数据----------"); if (students.size() == 0) { System.out.println("当前无数据，请先添加数据！"); } else { System.out.println("班级\t\t学号\t\t姓名\t\t平均分"); System.out.println("---------------------------------"); for (Student student : students) { System.out.format("%s\t\t%d\t\t%s\t\t%.2f\n", student.getGrade(), student.getId(), student.getName(), student.getAvg(student)); } } }（3）查找学生成绩 根据输入的学号来查找对应学生的相关成绩信息；
核心代码： if (flag == -1) { System.out.println("未找到对应学号的学生，请确认后重新输入！"); } else { System.out.println("对应学号的学生成绩如下："); System.out.println("班级\t\t学号\t\t姓名\t\t数学\t\t英语\t\t体育\t\tJava\t\tC++\t\t政治\t\t算法\t\t平均分"); System.out.format("%s\t%d\t\t%s\t\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\n", student.getGrade(), student.getId(), student.getName(), student.getMath(), student.getEnglish(), student.getSport(), student.getJava(), student.getcPlusPlus(), student.getPolity(), student.getAlgorithm(), student.getAvg(student)); System.out.println("查找信息成功！"); }（4）修改学生成绩 根据输入的学号来对对应学生的成绩进行修改；
代码块： float math = scanner.nextFloat(); System.out.println("英语"); float english = scanner.nextFloat(); System.out.println("体育"); float sport = scanner.nextFloat(); System.out.println("Java"); float java = scanner.nextFloat(); System.out.println("C++"); float cPlusPlus = scanner.nextFloat(); System.out.println("政治"); float polity = scanner.nextFloat(); System.out.println("算法"); float algorithm = scanner.nextFloat(); student.setMath(math); student.setAlgorithm(algorithm); student.setEnglish(english); student.setcPlusPlus(cPlusPlus); student.setJava(java); student.setSport(sport); student.setPolity(polity); // 获取平均分 double avg = getAvg(student); student.setAverage(avg); System.out.println("修改成功！"); } else { System.out.println("未找到对应学号的学生，请确认后重新输入！"); } break; } } }（5）删除学生成绩 根据输入的学生学号，删除对应学生的成绩信息；
核心判断： if (students.isEmpty()) { System.out.println("当前无数据，请添加后重试"); } else { System.out.println("输入要删除学生成绩的学号"); long id = scanner.nextLong(); int index = -1; for (int i = 0; i < students.size(); i++) { Student student = students.get(i); if (student.getId() == id) { index = i; break; } } if (index == -1) { System.out.println("未找到对应学号学生信息，请确认后再删除！"); } else { students.remove(index); System.out.println("----------删除成功----------"); } }（6）排序（使用平均分来进行排序） 在我们排序前先再次进行录入数据
按照从大到小排序；
核心代码： if (students.isEmpty()) { System.out.println("当前无数据，请添加后重试"); } else { for (int i = 0; i < students.size() - 1; i++) { if (students.get(i).getAvg(students.get(i)) < students.get(i + 1).getAvg(students.get(i + 1))) { Student tmp = students.get(i); students.set(i, students.get(i + 1)); students.set(i + 1, tmp); } }
（7）显示所有成绩 简单遍历所有学生成绩，然后打印出来；
完整代码： 1、Student import java.util.*; public class Student { public static Scanner scanner = new Scanner(System.in); private String grade;// 班级 private long id;// 学号 private String name;// 姓名 private float math;// 高数 private float english;// 英语 private float sport;// 体育 private float java;// Java private float cPlusPlus;// C++ private float polity;// 政治 private float algorithm;// 算法 private double average;// 平均分 public Student() { } public Student(String grade, long id, String name, float math, float english, float sport, float java, float cPlusPlus, float polity, float algorithm, double average) { this.grade = grade; this.id = id; this.name = name; this.math = math; this.english = english; this.sport = sport; this.java = java; this.cPlusPlus = cPlusPlus; this.polity = polity; this.algorithm = algorithm; this.average = average; } public String getGrade() { return grade; } public void setGrade(String grade) { this.grade = grade; } public long getId() { return id; } public void setId(long id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public float getMath() { return math; } public void setMath(float math) { this.math = math; } public float getEnglish() { return english; } public void setEnglish(float english) { this.english = english; } public float getSport() { return sport; } public void setSport(float sport) { this.sport = sport; } public float getJava() { return java; } public void setJava(float java) { this.java = java; } public float getcPlusPlus() { return cPlusPlus; } public void setcPlusPlus(float cPlusPlus) { this.cPlusPlus = cPlusPlus; } public float getPolity() { return polity; } public void setPolity(float polity) { this.polity = polity; } public float getAlgorithm() { return algorithm; } public void setAlgorithm(float algorithm) { this.algorithm = algorithm; } public double getAvg(Student student) { return (student.getAlgorithm() + student.getcPlusPlus() + student.getEnglish() + student.getSport() + student.getJava() + student.getPolity() + student.getMath()) / 7; } public void setAverage(double average) { this.average = average; } //录入学生信息 public void addScore(ArrayList students) { System.out.println("----------录入学生数据----------"); System.out.println("请依次输入如下数据："); long id; while (true) { System.out.println("学号"); id = scanner.nextInt(); if (isValid(students, id)) { System.out.println("学号重复，请重新输入"); } else { break; } } System.out.println("年级"); String grade = scanner.next(); System.out.println("姓名"); String name = scanner.next(); System.out.println("数学"); float math = scanner.nextFloat(); System.out.println("英语"); float english = scanner.nextFloat(); System.out.println("体育"); float sport = scanner.nextFloat(); System.out.println("Java"); float java = scanner.nextFloat(); System.out.println("C++"); float cPlusPlus = scanner.nextFloat(); System.out.println("政治"); float polity = scanner.nextFloat(); System.out.println("算法"); float algorithm = scanner.nextFloat(); // 创建对象，并设置属性，然后将其加入学生对象集合 Student student = new Student(); student.setId(id); student.setGrade(grade); student.setName(name); student.setMath(math); student.setAlgorithm(algorithm); student.setEnglish(english); student.setcPlusPlus(cPlusPlus); student.setJava(java); student.setSport(sport); student.setPolity(polity); // 获取平均分 double avg = getAvg(student); student.setAverage(avg); // 添加到集合 students.add(student); // 提示信息 System.out.println("添加成功"); } //判断学号是否可用 public boolean isValid(ArrayList students, long id) { for (Student student : students) { if (student.getId() == id) { return true; } } return false; } //显示简单统计数据 public void showAvg(ArrayList students) { System.out.println("----------输出学生统计数据----------"); if (students.size() == 0) { System.out.println("当前无数据，请先添加数据！"); } else { System.out.println("班级\t\t学号\t\t姓名\t\t平均分"); System.out.println("---------------------------------"); for (Student student : students) { System.out.format("%s\t\t%d\t\t%s\t\t%.2f\n", student.getGrade(), student.getId(), student.getName(), student.getAvg(student)); } } } //查找对应学号学生的成绩信息 public void lookupStudent(ArrayList students) { System.out.println("----------查找学生成绩----------"); if (students.size() == 0) { System.out.println("当前无数据，请添加后重试"); } else { System.out.println("请输入要查找学生的学号："); long id = scanner.nextLong(); int flag = -1; Student student = new Student(); // 查找对应学号，找到就退出 for (int i = 0; i < students.size(); i++) { student = students.get(i); if (student.getId() == id) { flag = i; break; } } if (flag == -1) { System.out.println("未找到对应学号的学生，请确认后重新输入！"); } else { System.out.println("对应学号的学生成绩如下："); System.out.println("班级\t\t学号\t\t姓名\t\t数学\t\t英语\t\t体育\t\tJava\t\tC++\t\t政治\t\t算法\t\t平均分"); System.out.format("%s\t%d\t\t%s\t\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\n", student.getGrade(), student.getId(), student.getName(), student.getMath(), student.getEnglish(), student.getSport(), student.getJava(), student.getcPlusPlus(), student.getPolity(), student.getAlgorithm(), student.getAvg(student)); System.out.println("查找信息成功！"); } } } //修改对应学号学生的信息 public void modifyStudent(ArrayList students) { System.out.println("----------修改学生成绩----------"); if (students.isEmpty()) { System.out.println("当前无数据，请添加后重试"); } else { System.out.println("请输入要修改学生的学号："); long id = scanner.nextLong(); for (Student student : students) { if (id == student.getId()) { System.out.println("请重新输入该学生的成绩"); System.out.println("数学"); float math = scanner.nextFloat(); System.out.println("英语"); float english = scanner.nextFloat(); System.out.println("体育"); float sport = scanner.nextFloat(); System.out.println("Java"); float java = scanner.nextFloat(); System.out.println("C++"); float cPlusPlus = scanner.nextFloat(); System.out.println("政治"); float polity = scanner.nextFloat(); System.out.println("算法"); float algorithm = scanner.nextFloat(); student.setMath(math); student.setAlgorithm(algorithm); student.setEnglish(english); student.setcPlusPlus(cPlusPlus); student.setJava(java); student.setSport(sport); student.setPolity(polity); // 获取平均分 double avg = getAvg(student); student.setAverage(avg); System.out.println("修改成功！"); } else { System.out.println("未找到对应学号的学生，请确认后重新输入！"); } break; } } } //删除学生成绩 public void deleteStudent(ArrayList students) { System.out.println("----------删除学生成绩----------"); if (students.isEmpty()) { System.out.println("当前无数据，请添加后重试"); } else { System.out.println("输入要删除学生成绩的学号"); long id = scanner.nextLong(); int index = -1; for (int i = 0; i < students.size(); i++) { Student student = students.get(i); if (student.getId() == id) { index = i; break; } } if (index == -1) { System.out.println("未找到对应学号学生信息，请确认后再删除！"); } else { students.remove(index); System.out.println("----------删除成功----------"); } } } //显示所有学生成绩 public void showAllStudent(ArrayList students) { if (students.isEmpty()) { System.out.println("当前无数据，请先添加数据"); } else { System.out.println("----------所有学生成绩如下----------"); System.out.println("班级\t\t学号\t\t姓名\t\t数学\t\t英语\t\t体育\t\tJava\t\tC++\t\t政治\t\t算法\t\t平均分"); for (Student student : students) { System.out.format("%s\t%d\t%s\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\n", student.getGrade(), student.getId(), student.getName(), student.getMath(), student.getEnglish(), student.getSport(), student.getJava(), student.getcPlusPlus(), student.getPolity(), student.getAlgorithm(), student.getAvg(student)); } } } //按照平均分排序 public void sortStudent(ArrayList students) { if (students.isEmpty()) { System.out.println("当前无数据，请添加后重试"); } else { for (int i = 0; i < students.size() - 1; i++) { if (students.get(i).getAvg(students.get(i)) < students.get(i + 1).getAvg(students.get(i + 1))) { Student tmp = students.get(i); students.set(i, students.get(i + 1)); students.set(i + 1, tmp); } } System.out.println("排序后的学生成绩"); System.out.println("班级\t\t学号\t\t姓名\t\t数学\t\t英语\t\t体育\t\tJava\t\tC++\t\t政治\t\t算法\t\t平均分"); for (Student student : students) { System.out.format("%s\t%d\t%s\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\t%.2f\n", student.getGrade(), student.getId(), student.getName(), student.getMath(), student.getEnglish(), student.getSport(), student.getJava(), student.getcPlusPlus(), student.getPolity(), student.getAlgorithm(), student.getAvg(student)); } } } }2、Main import java.util.*; public class Main { public static Scanner scanner = new Scanner(System.in); public static ArrayList students = new ArrayList(); public static void main(String[] args) { while (true) { System.out.println("------------学生成绩管理系统-------------"); System.out.println("【1】录入学生成绩"); System.out.println("【2】显示统计数据"); System.out.println("【3】查找学生成绩"); System.out.println("【4】修改学生成绩"); System.out.println("【5】删除学生成绩"); System.out.println("【6】按平均分排列"); System.out.println("【7】显示所有成绩"); System.out.println("【0】退出管理系统"); Student student = new Student(); System.out.println("输入你的选择"); String choice = scanner.next(); switch (choice) { case "1": student.addScore(students); break; case "2": student.showAvg(students); break; case "3": student.lookupStudent(students); break; case "4": student.modifyStudent(students); break; case "5": student.deleteStudent(students); break; case "6": student.sortStudent(students); break; case "7": student.showAllStudent(students); break; case "0": System.exit(0); default: break; } } } } |
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