java课程设计题目及代码题目：学生成绩管理系统设计一个学生成绩管理系统，能够实现以下功能：1. 添加学生信息：录入学生的姓名、学号、性别等基本信息。
2. 添加学生成绩：录入学生的各门成绩，包括语文、数学、英语等课程。
3. 查找学生成绩：根据学号或姓名查找学生的成绩信息。
4. 修改学生成绩：根据学号或姓名修改学生的成绩信息。
5. 删除学生成绩：根据学号或姓名删除学生的成绩信息。
6. 统计学生成绩：统计全班学生的各门课程的平均分、最高分和最低分。
代码实现如下：```javaimport java.util.ArrayList;import java.util.HashMap;import java.util.Map;import java.util.Scanner;class Student {private String name;private String studentId;private String gender;private Map<String, Integer> scores;public Student(String name, String studentId, String gender) { = name;this.studentId = studentId;this.gender = gender;this.scores = new HashMap<>();}public String getName() {return name;}public String getStudentId() {return studentId;}public String getGender() {return gender;}public Map<String, Integer> getScores() {return scores;}public void addScore(String subject, int score) {scores.put(subject, score);}public void updateScore(String subject, int score) { scores.put(subject, score);}public void removeScore(String subject) {scores.remove(subject);}}class GradeManagementSystem {private ArrayList<Student> students;public GradeManagementSystem() {students = new ArrayList<>();}public void addStudent(String name, String studentId, String gender) {students.add(new Student(name, studentId, gender));}public Student findStudentById(String studentId) {for (Student student : students) {if (student.getStudentId().equals(studentId)) {return student;}}return null;}public Student findStudentByName(String name) {for (Student student : students) {if (student.getName().equals(name)) {return student;}}return null;}public void addScore(String studentId, String subject, int score) {Student student = findStudentById(studentId);if (student != null) {student.addScore(subject, score);}}public void updateScore(String studentId, String subject, int score) {Student student = findStudentById(studentId);if (student != null) {student.updateScore(subject, score);}}public void removeScore(String studentId, String subject) {Student student = findStudentById(studentId);if (student != null) {student.removeScore(subject);}}public void printStudentInfo(Student student) {System.out.println("姓名：" + student.getName());System.out.println("学号：" + student.getStudentId());System.out.println("性别：" + student.getGender());System.out.println("成绩：");for (Map.Entry<String, Integer> entry :student.getScores().entrySet()) {System.out.println(entry.getKey() + "：" +entry.getValue());}}public void printClassStatistics() {int chineseTotal = 0;int mathTotal = 0;int englishTotal = 0;int chineseMax = 0;int mathMax = 0;int englishMax = 0;int chineseMin = Integer.MAX_VALUE;int mathMin = Integer.MAX_VALUE;int englishMin = Integer.MAX_VALUE;for (Student student : students) {Map<String, Integer> scores = student.getScores();if (scores.containsKey("语文")) {int chineseScore = scores.get("语文");chineseTotal += chineseScore;chineseMax = Math.max(chineseMax, chineseScore);chineseMin = Math.min(chineseMin, chineseScore); }if (scores.containsKey("数学")) {int mathScore = scores.get("数学");mathTotal += mathScore;mathMax = Math.max(mathMax, mathScore);mathMin = Math.min(mathMin, mathScore);}if (scores.containsKey("英语")) {int englishScore = scores.get("英语");englishTotal += englishScore;englishMax = Math.max(englishMax, englishScore); englishMin = Math.min(englishMin, englishScore); }}int studentCount = students.size();double chineseAverage = (double) chineseTotal / studentCount;double mathAverage = (double) mathTotal / studentCount; double englishAverage = (double) englishTotal / studentCount;System.out.println("语文最高分：" + chineseMax);System.out.println("数学最高分：" + mathMax);System.out.println("英语最高分：" + englishMax);System.out.println("语文最低分：" + chineseMin);System.out.println("数学最低分：" + mathMin);System.out.println("英语最低分：" + englishMin);System.out.println("语文平均分：" + chineseAverage); System.out.println("数学平均分：" + mathAverage); System.out.println("英语平均分：" + englishAverage); }}public class Main {public static void main(String[] args) {GradeManagementSystem system = new GradeManagementSystem();// 添加学生信息system.addStudent("张三", "001", "男");system.addStudent("李四", "002", "女");system.addStudent("王五", "003", "男");// 添加学生成绩system.addScore("001", "语文", 90);system.addScore("001", "数学", 85);system.addScore("001", "英语", 92);system.addScore("002", "语文", 80);system.addScore("002", "数学", 75);system.addScore("002", "英语", 88);system.addScore("003", "语文", 95);system.addScore("003", "数学", 90);system.addScore("003", "英语", 97);// 查找学生成绩Student student = system.findStudentById("001"); if (student != null) {system.printStudentInfo(student);}// 修改学生成绩system.updateScore("002", "数学", 78);student = system.findStudentById("002");if (student != null) {system.printStudentInfo(student);}// 删除学生成绩system.removeScore("003", "语文");student = system.findStudentById("003");if (student != null) {system.printStudentInfo(student);}// 统计学生成绩system.printClassStatistics();}}```这是一个简单的学生成绩管理系统，通过添加学生信息、添加学生成绩、查找学生成绩、修改学生成绩、删除学生成绩和统计学生成绩等功能，可以对学生的成绩进行管理和操作。
