开发一个简单的系统，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;

以下是一个简单的实现代码，使用了对象数组来存储学生信息：

import java.util.Scanner;

public class StudentManagementSystem {
    private static final int MAX_STUDENTS = 100; // 最大学生数量
    private Student[] students; // 存储学生信息的数组
    private int numStudents; // 当前学生数量

    public StudentManagementSystem() {
        students = new Student[MAX_STUDENTS];
        numStudents = 0;
    }

    // 添加学生
    public void addStudent() {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入学生信息：");
        System.out.print("学号：");
        int stuID = scanner.nextInt();
        // 检查学号是否已经存在
        for (int i = 0; i < numStudents; i++) {
            if (students[i].getStuID() == stuID) {
                System.out.println("学号已经存在，请重新输入！");
                return;
            }
        }
        System.out.print("姓名：");
        String stuName = scanner.next();
        System.out.print("年龄：");
        int stuAge = scanner.nextInt();
        System.out.print("班级：");
        String stuClass = scanner.next();
        System.out.print("成绩：");
        float stuScore = scanner.nextFloat();
        students[numStudents++] = new Student(stuID, stuName, stuAge, stuClass, stuScore);
        System.out.println("添加成功！");
    }

    // 删除学生
    public void deleteStudent() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入要删除的学生学号：");
        int stuID = scanner.nextInt();
        for (int i = 0; i < numStudents; i++) {
            if (students[i].getStuID() == stuID) {
                // 将要删除的学生从数组中移除
                for (int j = i; j < numStudents - 1; j++) {
                    students[j] = students[j + 1];
                }
                students[--numStudents] = null;
                System.out.println("删除成功！");
                return;
            }
        }
        System.out.println("学号不存在！");
    }

    // 修改学生信息
    public void updateStudent() {
        Scanner scanner = new Scanner(System.in);
        System.out.print("请输入要修改的学生学号：");
        int stuID = scanner.nextInt();
        for (int i = 0; i < numStudents; i++) {
            if (students[i].getStuID() == stuID) {
                System.out.println("请输入修改后的学生信息：");
                System.out.print("姓名：");
                String stuName = scanner.next();
                System.out.print("年龄：");
                int stuAge = scanner.nextInt();
                System.out.print("班级：");
                String stuClass = scanner.next();
                System.out.print("成绩：");
                float stuScore = scanner.nextFloat();
                students[i].setStuName(stuName);
                students[i].setStuAge(stuAge);
                students[i].setStuClass(stuClass);
                students[i].setStuScore(stuScore);
                System.out.println("修改成功！");
                return;
            }
        }
        System.out.println("学号不存在！");
    }

    // 遍历学生信息
    public void displayStudents() {
        System.out.println("学生信息如下：");
        System.out.println("学号\t姓名\t年龄\t班级\t成绩");
        for (int i = 0; i < numStudents; i++) {
            System.out.println(students[i].getStuID() + "\t" +
                    students[i].getStuName() + "\t" +
                    students[i].getStuAge() + "\t" +
                    students[i].getStuClass() + "\t" +
                    students[i].getStuScore());
        }
    }

    public static void main(String[] args) {
        StudentManagementSystem system = new StudentManagementSystem();
        Scanner scanner = new Scanner(System.in);
        while (true) {
            System.out.println("请选择操作：");
            System.out.println("1.添加学生");
            System.out.println("2.删除学生");
            System.out.println("3.修改学生信息");
            System.out.println("4.遍历学生信息");
            System.out.println("5.退出");
            int choice = scanner.nextInt();
            switch (choice) {
                case 1:
                    system.addStudent();
                    break;
                case 2:
                    system.deleteStudent();
                    break;
                case 3:
                    system.updateStudent();
                    break;
                case 4:
                    system.displayStudents();
                    break;
                case 5:
                    System.exit(0);
                    break;
                default:
                    System.out.println("输入有误，请重新选择！");
                    break;
            }
        }
    }
}

class Student {
    private int stuID; // 学号
    private String stuName; // 姓名
    private int stuAge; // 年龄
    private String stuClass; // 班级
    private float stuScore; // 成绩

    public Student(int stuID, String stuName, int stuAge, String stuClass, float 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 float getStuScore() {
        return stuScore;
    }

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

这个程序运行后，可以让用户选择添加、删除、修改或遍历学生信息，根据用户的选择进行相应的操作。