java面向对象的一维数组学生系统

好的，我们来实现一个Java面向对象的一维数组学生系统。

首先，我们可以定义一个Student类，包括学生的姓名、学号、性别、年龄、成绩等属性，以及一些方法如获取姓名、获取学号等。

public class Student {
    private String name;
    private String id;
    private String gender;
    private int age;
    private double[] scores;

    public Student(String name, String id, String gender, int age, double[] scores) {
        this.name = name;
        this.id = id;
        this.gender = gender;
        this.age = age;
        this.scores = scores;
    }

    public String getName() {
        return name;
    }

    public String getId() {
        return id;
    }

    public String getGender() {
        return gender;
    }

    public int getAge() {
        return age;
    }

    public double[] getScores() {
        return scores;
    }

    public double getAverageScore() {
        double sum = 0;
        for (double score : scores) {
            sum += score;
        }
        return sum / scores.length;
    }
}

然后，我们可以定义一个StudentSystem类，包括添加学生、删除学生、修改学生信息、查询学生等方法。

import java.util.Arrays;
import java.util.Scanner;

public class StudentSystem {
    private Student[] students;
    private int size;

    public StudentSystem(int capacity) {
        students = new Student[capacity];
        size = 0;
    }

    public boolean addStudent(Student student) {
        if (size >= students.length) {
            return false;
        }
        students[size++] = student;
        return true;
    }

    public boolean removeStudent(String id) {
        for (int i = 0; i < size; i++) {
            if (students[i].getId().equals(id)) {
                students[i] = students[size - 1];
                students[--size] = null;
                return true;
            }
        }
        return false;
    }

    public boolean updateStudent(String id, Student newStudent) {
        for (int i = 0; i < size; i++) {
            if (students[i].getId().equals(id)) {
                students[i] = newStudent;
                return true;
            }
        }
        return false;
    }

    public Student queryStudent(String id) {
        for (int i = 0; i < size; i++) {
            if (students[i].getId().equals(id)) {
                return students[i];
            }
        }
        return null;
    }

    public void listStudents() {
        for (int i = 0; i < size; i++) {
            System.out.println(students[i].getName() + " " + students[i].getId() + " " + students[i].getGender() + " " + students[i].getAge() + " " + Arrays.toString(students[i].getScores()) + " " + students[i].getAverageScore());
        }
    }

    public static void main(String[] args) {
        StudentSystem studentSystem = new StudentSystem(100);
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("请输入操作：1.添加学生 2.删除学生 3.修改学生信息 4.查询学生 5.列出所有学生 6.退出系统");
            int choice = scanner.nextInt();
            if (choice == 1) {
                System.out.println("请输入学生姓名、学号、性别、年龄、成绩：");
                String name = scanner.next();
                String id = scanner.next();
                String gender = scanner.next();
                int age = scanner.nextInt();
                double[] scores = new double[3];
                for (int i = 0; i < 3; i++) {
                    scores[i] = scanner.nextDouble();
                }
                Student student = new Student(name, id, gender, age, scores);
                boolean result = studentSystem.addStudent(student);
                if (result) {
                    System.out.println("添加成功！");
                } else {
                    System.out.println("添加失败，学生人数已满！");
                }
            } else if (choice == 2) {
                System.out.println("请输入要删除的学生学号：");
                String id = scanner.next();
                boolean result = studentSystem.removeStudent(id);
                if (result) {
                    System.out.println("删除成功！");
                } else {
                    System.out.println("删除失败，学生不存在！");
                }
            } else if (choice == 3) {
                System.out.println("请输入要修改的学生学号和新的学生信息：");
                String id = scanner.next();
                String name = scanner.next();
                String gender = scanner.next();
                int age = scanner.nextInt();
                double[] scores = new double[3];
                for (int i = 0; i < 3; i++) {
                    scores[i] = scanner.nextDouble();
                }
                Student newStudent = new Student(name, id, gender, age, scores);
                boolean result = studentSystem.updateStudent(id, newStudent);
                if (result) {
                    System.out.println("修改成功！");
                } else {
                    System.out.println("修改失败，学生不存在！");
                }
            } else if (choice == 4) {
                System.out.println("请输入要查询的学生学号：");
                String id = scanner.next();
                Student student = studentSystem.queryStudent(id);
                if (student != null) {
                    System.out.println(student.getName() + " " + student.getId() + " " + student.getGender() + " " + student.getAge() + " " + Arrays.toString(student.getScores()) + " " + student.getAverageScore());
                } else {
                    System.out.println("查询失败，学生不存在！");
                }
            } else if (choice == 5) {
                studentSystem.listStudents();
            } else if (choice == 6) {
                break;
            } else {
                System.out.println("请输入正确的操作！");
            }
        }
    }
}

以上就是一个Java面向对象的一维数组学生系统的实现，可以通过控制台进行操作。