开发一个简单的java系统，该系统可以对学生信息进行增删改查;(用对象数组实现) 要求： (1)录入学生：键盘录入学生信息，使用数组存储学生信息，要求学号不能重复； (2)删除学生：键盘录入要删除的学生学号，将学生从数组中移除； (3)修改学生：键盘录入要修改学生的学号和修改后的信息，将数组中学生的信息修改； (4)遍历学生: 将所有的学生信息输出到控制台； 学生有如下私有字段属性： 整数类型的学号 stuID 字符串类型的姓名 stuName 整数类型的年龄 stuAge 字符串类型的班级名称 stuClass 浮点类型成绩 stuScore;

以下是一个简单的Java系统，使用对象数组实现对学生信息的增删改查：

import java.util.Scanner;

public class StudentSystem {
    private Student[] students; // 学生数组
    private int size; // 学生数量

    // 构造函数，初始化学生数组和数量
    public StudentSystem(int capacity) {
        students = new Student[capacity];
        size = 0;
    }

    // 录入学生信息
    public void addStudent() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入学号：");
        int stuID = scanner.nextInt();
        scanner.nextLine(); // 将换行符读取掉
        System.out.println("请输入姓名：");
        String stuName = scanner.nextLine();
        System.out.println("请输入年龄：");
        int stuAge = scanner.nextInt();
        scanner.nextLine(); // 将换行符读取掉
        System.out.println("请输入班级：");
        String stuClass = scanner.nextLine();
        System.out.println("请输入成绩：");
        double stuScore = scanner.nextDouble();

        // 判断学号是否重复
        for (int i = 0; i < size; i++) {
            if (students[i].getStuID() == stuID) {
                System.out.println("学号重复，请重新输入！");
                return;
            }
        }

        // 创建学生对象并添加到数组中
        Student student = new Student(stuID, stuName, stuAge, stuClass, stuScore);
        students[size++] = student;
        System.out.println("添加成功！");
    }

    // 删除学生信息
    public void deleteStudent() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要删除的学生学号：");
        int stuID = scanner.nextInt();

        // 查找学生在数组中的位置
        int index = -1;
        for (int i = 0; i < size; i++) {
            if (students[i].getStuID() == stuID) {
                index = i;
                break;
            }
        }

        // 如果找到学生，则将其从数组中移除
        if (index != -1) {
            for (int i = index; i < size - 1; i++) {
                students[i] = students[i + 1];
            }
            students[--size] = null;
            System.out.println("删除成功！");
        } else {
            System.out.println("未找到该学生！");
        }
    }

    // 修改学生信息
    public void updateStudent() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要修改的学生学号：");
        int stuID = scanner.nextInt();

        // 查找学生在数组中的位置
        int index = -1;
        for (int i = 0; i < size; i++) {
            if (students[i].getStuID() == stuID) {
                index = i;
                break;
            }
        }

        // 如果找到学生，则修改其信息
        if (index != -1) {
            System.out.println("请输入修改后的姓名：");
            String stuName = scanner.nextLine();
            System.out.println("请输入修改后的年龄：");
            int stuAge = scanner.nextInt();
            scanner.nextLine(); // 将换行符读取掉
            System.out.println("请输入修改后的班级：");
            String stuClass = scanner.nextLine();
            System.out.println("请输入修改后的成绩：");
            double stuScore = scanner.nextDouble();

            students[index].setStuName(stuName);
            students[index].setStuAge(stuAge);
            students[index].setStuClass(stuClass);
            students[index].setStuScore(stuScore);
            System.out.println("修改成功！");
        } else {
            System.out.println("未找到该学生！");
        }
    }

    // 遍历学生信息
    public void listStudents() {
        if (size == 0) {
            System.out.println("没有学生信息！");
        } else {
            System.out.println("学号\t姓名\t年龄\t班级\t成绩");
            for (int i = 0; i < size; i++) {
                System.out.println(students[i]);
            }
        }
    }

    public static void main(String[] args) {
        StudentSystem studentSystem = new StudentSystem(100);
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("请选择操作：");
            System.out.println("1. 录入学生信息");
            System.out.println("2. 删除学生信息");
            System.out.println("3. 修改学生信息");
            System.out.println("4. 遍历学生信息");
            System.out.println("0. 退出");
            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    studentSystem.addStudent();
                    break;
                case 2:
                    studentSystem.deleteStudent();
                    break;
                case 3:
                    studentSystem.updateStudent();
                    break;
                case 4:
                    studentSystem.listStudents();
                    break;
                case 0:
                    System.exit(0);
                    break;
                default:
                    System.out.println("无效操作！");
                    break;
            }
        }
    }
}

class Student {
    private int stuID;
    private String stuName;
    private int stuAge;
    private String stuClass;
    private double stuScore;

    public Student(int stuID, String stuName, int stuAge, String stuClass, double stuScore) {
        this.stuID = stuID;
        this.stuName = stuName;
        this.stuAge = stuAge;
        this.stuClass = stuClass;
        this.stuScore = stuScore;
    }

    public int getStuID() {
        return stuID;
    }

    public void setStuID(int stuID) {
        this.stuID = stuID;
    }

    public String getStuName() {
        return stuName;
    }

    public void setStuName(String stuName) {
        this.stuName = stuName;
    }

    public int getStuAge() {
        return stuAge;
    }

    public void setStuAge(int stuAge) {
        this.stuAge = stuAge;
    }

    public String getStuClass() {
        return stuClass;
    }

    public void setStuClass(String stuClass) {
        this.stuClass = stuClass;
    }

    public double getStuScore() {
        return stuScore;
    }

    public void setStuScore(double stuScore) {
        this.stuScore = stuScore;
    }

    @Override
    public String toString() {
        return stuID + "\t" + stuName + "\t" + stuAge + "\t" + stuClass + "\t" + stuScore;
    }
}