四时宝库

题目：

学生成绩管理：设计一个学生成绩管理系统，使用ArrayList或LinkedList存储学生信息。每个学生有一个唯一的学号、姓名和成绩，实现添加、删除、查找和按照成绩进行排序等功能。

代码：

package com.example.practice;
//学生成绩管理：设计一个学生成绩管理系统，使用ArrayList或LinkedList存储学生信息。
// 每个学生有一个唯一的学号、姓名和成绩，实现添加、删除、查找和按照成绩进行排序等功能。
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Scanner;

class Student {
    private int id;
    private String name;
    private int score;

    public Student(int id, String name, int score) {
        this.id = id;
        this.name = name;
        this.score = score;
    }

    public int getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public int getScore() {
        return score;
    }
}

public class Practice15 {
    private List<Student> students;
    public Practice15() {
        students = new ArrayList<>();
    }
    public void addStudent(Student student) {
        students.add(student);
    }
    public void removeStudent(int id) {
        for (Student student : students) {
            if (student.getId() == id) {
                students.remove(student);
                break;
            }
        }
    }
    public Student findStudent(int id) {
        for (Student student : students) {
            if (student.getId() == id) {
                return student;
            }
        }
        return null;
    }
    public void sortStudentsByScore() {
        Collections.sort(students, Comparator.comparingInt(Student::getScore));
    }
    public void displayStudents() {
        for (Student student : students) {
            System.out.println("Student ID: " + student.getId());
            System.out.println("Name: " + student.getName());
            System.out.println("Score: " + student.getScore());
            System.out.println("--------------------------");
        }
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        Practice15 managementSystem = new Practice15();

        boolean running = true;
        while (running) {
            System.out.println("1. Add a student");
            System.out.println("2. Remove a student");
            System.out.println("3. Find a student");
            System.out.println("4. Sort students by score");
            System.out.println("5. Display all students");
            System.out.println("0. Exit");
            System.out.print("Enter your choice: ");
            int choice = scanner.nextInt();
            scanner.nextLine();

            switch (choice) {
                case 1:
                    System.out.print("Enter student ID: ");
                    int id = scanner.nextInt();
                    scanner.nextLine();
                    System.out.print("Enter student name: ");
                    String name = scanner.nextLine();
                    System.out.print("Enter student score: ");
                    int score = scanner.nextInt();
                    scanner.nextLine();
                    Student student = new Student(id, name, score);
                    managementSystem.addStudent(student);
                    System.out.println("Student added successfully!");
                    break;
                case 2:
                    System.out.print("Enter student ID: ");
                    int removeId = scanner.nextInt();
                    scanner.nextLine();
                    managementSystem.removeStudent(removeId);
                    System.out.println("Student removed successfully!");
                    break;
                case 3:
                    System.out.print("Enter student ID: ");
                    int findId = scanner.nextInt();
                    scanner.nextLine();
                    Student foundStudent = managementSystem.findStudent(findId);
                    if (foundStudent != null) {
                        System.out.println("Student ID: " + foundStudent.getId());
                        System.out.println("Name: " + foundStudent.getName());
                        System.out.println("Score: " + foundStudent.getScore());
                    } else {
                        System.out.println("Student not found!");
                    }
                    break;
                case 4:
                    managementSystem.sortStudentsByScore();
                    System.out.println("Students sorted by score!");
                    break;
                case 5:
                    managementSystem.displayStudents();
                    break;
                case 0:
                    running = false;
                    break;
                default:
                    System.out.println("Invalid choice!");
            }
        }

        scanner.close();
    }
}

运行结果截图：