写个java管理项目

好的，以下是一个简单的 Java 项目管理应用程序示例：

首先，我们需要定义一个项目类，它应该包含项目的名称、描述、截止日期等属性：

public class Project {
    private String name;
    private String description;
    private LocalDate deadline;

    public Project(String name, String description, LocalDate deadline) {
        this.name = name;
        this.description = description;
        this.deadline = deadline;
    }

    // getters and setters
    public String getName() {
        return name;
    }

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

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public LocalDate getDeadline() {
        return deadline;
    }

    public void setDeadline(LocalDate deadline) {
        this.deadline = deadline;
    }
}

接下来，我们需要定义一个项目管理器类，它应该包含一个列表来存储所有的项目，以及一些用于添加、删除和查找项目的方法：

import java.util.ArrayList;
import java.util.List;

public class ProjectManager {
    private List<Project> projects;

    public ProjectManager() {
        projects = new ArrayList<>();
    }

    public void addProject(Project project) {
        projects.add(project);
    }

    public void removeProject(Project project) {
        projects.remove(project);
    }

    public Project findProjectByName(String name) {
        for (Project project : projects) {
            if (project.getName().equals(name)) {
                return project;
            }
        }
        return null;
    }

    public List<Project> getProjects() {
        return projects;
    }
}

现在我们已经定义了项目和项目管理器类，我们可以编写一个简单的控制台应用程序来测试它们。以下是一个示例：

import java.time.LocalDate;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        ProjectManager manager = new ProjectManager();
        Scanner scanner = new Scanner(System.in);

        while (true) {
            System.out.println("1. Add a project");
            System.out.println("2. Remove a project");
            System.out.println("3. Find a project by name");
            System.out.println("4. Show all projects");
            System.out.println("5. Exit");

            int choice = scanner.nextInt();

            if (choice == 1) {
                System.out.print("Enter project name: ");
                String name = scanner.next();
                System.out.print("Enter project description: ");
                String description = scanner.next();
                System.out.print("Enter project deadline (yyyy-mm-dd): ");
                String deadlineString = scanner.next();
                LocalDate deadline = LocalDate.parse(deadlineString);
                Project project = new Project(name, description, deadline);
                manager.addProject(project);
                System.out.println("Project added.");
            } else if (choice == 2) {
                System.out.print("Enter project name: ");
                String name = scanner.next();
                Project project = manager.findProjectByName(name);
                if (project == null) {
                    System.out.println("Project not found.");
                } else {
                    manager.removeProject(project);
                    System.out.println("Project removed.");
                }
            } else if (choice == 3) {
                System.out.print("Enter project name: ");
                String name = scanner.next();
                Project project = manager.findProjectByName(name);
                if (project == null) {
                    System.out.println("Project not found.");
                } else {