2024/9/20日 日志

今天，进行了新的测试。
题目为简单的学生管理系统，包含增删改查。

点击查看代码

//张一衡 20234023
import java.util.ArrayList;
import java.util.Scanner;

public class Moontest {
    public static void main(String[] args) {
        StudentManager studentManager = new StudentManager();
        studentManager.runMenu();
    }
}

class Student {
    private String stunumber;
    private String name;
    private int age;
    private boolean sex;
    private double score;

    public Student() {}

    public Student(String stunumber, String name, int age, boolean sex, double score) {
        this.stunumber=stunumber;
        this.name = name;
        this.age = age;
        this.sex = sex;
        this.score = score;
    }

    // Get and Set
    public String getStunumber() {
        return stunumber;
    }
    public void setStunumber(String stunumber) {
        this.stunumber = stunumber;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public boolean getSex() {
        return sex;
    }
    public void setSex(boolean sex) {
        this.sex = sex;
    }
    public double getScore() {
        return score;
    }
    public void setScore(double score) {
        this.score = score;
    }
}

class StudentManager {
    private ArrayList<Student> students = new ArrayList<>();
    private Scanner scanner = new Scanner(System.in);

    void showStudent() {
        if(students.isEmpty()) {
            System.out.println("学生信息为空！");
        }else{
            for(Student student:students) {
                System.out.println("*************************************");
                System.out.println("学号为: " + student.getStunumber());
                System.out.println("姓名为: " + student.getName());
                System.out.println("年龄为: " + student.getAge());
                System.out.println("性别为: " + (student.getSex() ? "男" : "女"));
                System.out.println("分数为: " + student.getScore());
                System.out.println("*************************************");
            }
        }
    }
    void addStudent(String stunumber, String name, int age, boolean sex, double score) {
        for (Student student : students) {
            if (student.getStunumber().equals(stunumber)) {
                System.out.println("学号重复！");
                return;
            }
        }
        students.add(new Student(stunumber, name, age, sex, score));
    }

    void deleteStudent(String stunumber) {
        for (int i = 0; i < students.size(); i++) {
            if (students.get(i).getStunumber().equals(stunumber)) {
                students.remove(i);
                System.out.println("学生信息已删除。");
                return;
            }
        }
        System.out.println("未找到该学号的学生。");
    }

    void updateStudent(String stunumber) {
        for (Student student : students) {
            if (student.getStunumber().equals(stunumber)) {
                System.out.println("请输入你要修改的学生信息" +"(学号，姓名，年龄，性别(1 = 男 / 0 = 女)，成绩)：");
                String newStunumber = scanner.nextLine();
                String changename = scanner.nextLine();
                int changeage = scanner.nextInt();
                boolean changesex = scanner.nextInt() == 1;
                double changescore = scanner.nextDouble();
                student.setStunumber(newStunumber);
                student.setName(changename);
                student.setAge(changeage);
                student.setSex(changesex);
                student.setScore(changescore);
                System.out.println("学生信息已更新。");
                return;
            }else{
                System.out.println("未找到该学号的学生。");
            }
        }
    }

    void selectStudent(String stunumber) {
        for (Student student : students) {
            if (student.getStunumber().equals(stunumber)) {
                System.out.println("*************************************");
                System.out.println("学号为: " + student.getStunumber());
                System.out.println("姓名为: " + student.getName());
                System.out.println("年龄为: " + student.getAge());
                System.out.println("性别为: " + (student.getSex() ? "男" : "女"));
                System.out.println("成绩为: " + student.getScore());
                System.out.println("*************************************");
                return;
            }
        }
        System.out.println("未找到该学号的学生。");
    }

    void showMenu() {
        System.out.println("***************************************************************");
        System.out.println("          石家庄铁道大学软件工程系学生信息管理系统");
        System.out.println("***************************************************************");
        System.out.println("                    1、遍历输出学生信息:");
        System.out.println("                    2、新学生信息录入:");
        System.out.println("                    3、删除学生信息:");
        System.out.println("                    4、修改学生信息:");
        System.out.println("                    5、查询学生信息:");
        System.out.println("***************************************************************");
    }

    void runMenu() {
        do {
            showMenu();
            System.out.print("请输入你的选择: ");
            int choice = scanner.nextInt();
            scanner.nextLine(); // Consume newline
            switch (choice) {
                case 1:
                    showStudent();
                    break;
                case 2:
                    System.out.println("请输入你要添加的学生信息(学号，姓名，年龄，性别(1 = 男 / 0 = 女)，成绩)：");
                    String addnumber = scanner.nextLine();
                    String addname = scanner.nextLine();
                    int addage = scanner.nextInt();
                    boolean addsex = scanner.nextInt() == 1;
                    double addscore = scanner.nextDouble();
                    addStudent(addnumber, addname, addage, addsex, addscore);
                    break;
                case 3:
                    System.out.print("请输入你要删除的学生学号:");
                    String dnumber = scanner.nextLine();
                    deleteStudent(dnumber);
                    break;
                case 4:
                    System.out.println("请输入你要修改学生信息的学号:");
                    String changestunumber=scanner.nextLine();
                    updateStudent(changestunumber);
                    break;
                case 5:
                    System.out.print("请输入你要查询的学生学号:");
                    String selnumber = scanner.nextLine();
                    selectStudent(selnumber);
                    break;
                default:
                    System.out.println("该选项不存在，请你重新输入！");
            }
        } while (true);
    }
}

在代码中我运用了ArrayList来进行空间部署以处理定量空间问题，当然数组也是可以处理的。
以下是用数组的处理方式，大同小异，只是用Count计数来处理有效问题。

点击查看代码

```

import java.util.Scanner;

public class Moontest {
public static void main(String[] args) {
StudentManager studentManager = new StudentManager();
studentManager.runMenu();
}
}

class Student {
private String stunumber;
private String name;
private int age;
private boolean sex;
private double score;

public Student() {}

public Student(String stunumber, String name, int age, boolean sex, double score) {
    this.stunumber = stunumber;
    this.name = name;
    this.age = age;
    this.sex = sex;
    this.score = score;
}

// Getters and Setters
public String getStunumber() {
    return stunumber;
}
public void setStunumber(String stunumber) {
    this.stunumber = stunumber;
}

public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}

public int getAge() {
    return age;
}
public void setAge(int age) {
    this.age = age;
}

public boolean getSex() {
    return sex;
}
public void setSex(boolean sex) {
    this.sex = sex;
}

public double getScore() {
    return score;
}
public void setScore(double score) {
    this.score = score;
}

}

class StudentManager {
private Student[] students = new Student[5];
private int studentCount = 0; // Keep track of the number of students
private Scanner scanner = new Scanner(System.in);

void showStudent() {
    if (studentCount == 0) {
        System.out.println("学生信息为空！");
        return;
    }
    for (int i = 0; i < studentCount; i++) {
        Student student = students[i];
        System.out.println("*************************************");
        System.out.println("学号为: " + student.getStunumber());
        System.out.println("姓名为: " + student.getName());
        System.out.println("年龄为: " + student.getAge());
        System.out.println("性别为: " + (student.getSex() ? "男" : "女"));
        System.out.println("分数为 + student.getScore());
        System.out.println("*************************************");
    }
}

void addStudent(String stunumber, String name, int age, boolean sex, double score) {
    if (studentCount >= students.length) {
        System.out.println("学生人数已满，无法添加更多学生！");
        return;
    }
    for (int i = 0; i < studentCount; i++) {
        if (students[i].getStunumber().equals(stunumber)) {
            System.out.println("学号重复！");
            return;
        }
    }
    students[studentCount] = new Student(stunumber, name, age, sex, score);
    studentCount++;
    System.out.println("学生信息添加成功！");
}

void deleteStudent(String stunumber) {
    for (int i = 0; i < studentCount; i++) {
        if (students[i].getStunumber().equals(stunumber)) {
            // Shift remaining elements to the left
            for (int j = i; j < studentCount - 1; j++) {
                students[j] = students[j + 1];
            }
            students[studentCount - 1] = null; // Clear the last element
            studentCount--;
            System.out.println("学生信息已删除。");
            return;
        }
    }
    System.out.println("未找到该学号的学生。");
}

void updateStudent(String stunumber, String name, int age, boolean sex, double score) {
    for (int i = 0; i < studentCount; i++) {
        if (students[i].getStunumber().equals(stunumber)) {
            students[i].setName(name);
            students[i].setAge(age);
            students[i].setSex(sex);
            students[i].setScore(score);
            System.out.println("学生信息已更新。");
            return;
        }
    }
    System.out.println("未找到该学号的学生。");
}

void selectStudent(String stunumber) {
   for(int i=0;i<studentCount;i++) {
        if (students[i].getStunumber().equals(stunumber)) {
            Student student = students[i];
            System.out.println("*************************************");
            System.out.println("学号为: " + student.getStunumber());
            System.out.println("姓名为: " + student.getName());
            System.out.println("年龄为: " + student.getAge());
            System.out.println("性别为: " + (student.getSex() ? "男" : "女"));
            System.out.println("成绩为: " + student.getScore());
            System.out.println("*************************************");
            return;
        }
    }
    System.out.println("未找到该学号的学生。");
}

void showMenu() {
    System.out.println("***************************************************************");
    System.out.println("          石家庄铁道大学软件工程系学生信息管理系统");
    System.out.println("***************************************************************");
    System.out.println("                    1、遍历输出学生信息:");
    System.out.println("                    2、新学生信息录入:");
    System.out.println("                    3、删除学生信息:");
    System.out.println("                    4、修改学生信息:");
    System.out.println("                    5、查询学生信息:");
    System.out.println("***************************************************************");
}

void runMenu() {
    do {
        showMenu();
        System.out.print("请输入你的选择: ");
        int choice = scanner.nextInt();
        scanner.nextLine(); // Consume newline
        switch (choice) {
            case 1:
                showStudent();
                break;
            case 2:
                System.out.println("请输入你要添加的学生信息(学号，姓名，年龄，性别(1 = 男 / 0 = 女)，成绩)：");
                String addnumber = scanner.nextLine();
                String addname = scanner.nextLine();
                int addage = scanner.nextInt();
                boolean addsex = scanner.nextInt() == 1;
                double addscore = scanner.nextDouble();
                addStudent(addnumber, addname, addage, addsex, addscore);
                break;
            case 3:
                System.out.print("请输入你要删除的学生学号:");
                String dnumber = scanner.nextLine();
                deleteStudent(dnumber);
                break;
            case 4:
                System.out.println("请输入你要修改的学生信息(学号，姓名，年龄，性别(1 = 男 / 0 = 女)，成绩)：");
                String changestunumber = scanner.nextLine();
                String changename = scanner.nextLine();
                int changeage = scanner.nextInt();
                boolean changesex = scanner.nextInt() == 1;
                double changescore = scanner.nextDouble();
                updateStudent(changestunumber, changename, changeage, changesex, changescore);
                break;
            case 5:
                System.out.print("请输入你要查询的学生学号:");
                String selnumber = scanner.nextLine();
                selectStudent(selnumber);
                break;
            default:
                System.out.println("该选项不存在，请你重新输入！");
        }
    } while (true);
}

}

</details>
通过这次测试，我对java代码的熟练度更进一步，同时对于数据处理上更有经验，但不足明显，应继续进一步学习，以及实践。

                                                                              ----------------------Moonbeamsc.