面向对象案例：电影院

@TOC

思路

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代码

结构

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具体代码

Movie.java

public class Movie {
    //一共七个
    private int id;
    private String name;
    private double price;
    private double score;
    private String director;
    private String actors;
    private String info;

    //get和set

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    public double getScore() {
        return score;
    }

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

    public String getDirector() {
        return director;
    }

    public void setDirector(String director) {
        this.director = director;
    }

    public String getActors() {
        return actors;
    }

    public void setActors(String actors) {
        this.actors = actors;
    }

    public String getInfo() {
        return info;
    }

    public void setInfo(String info) {
        this.info = info;
    }

    //设计private就需要有构造器，方便访问
    //有参 ： 为了创建对象时赋值
    public Movie(int id, String name, double price, double score, String director, String actors, String info) {
        this.id = id;
        this.name = name;
        this.price = price;
        this.score = score;
        this.director = director;
        this.actors = actors;
        this.info = info;
    }
    //无参： 实体类必须有
    public Movie(){}

}

MoiveOperator.java

public class MovieOperator {
    //业务操作类

    private Movie[] movies;

    //有参构造  不太懂为什么
    public MovieOperator(Movie[] movies) {
        this.movies = movies;
    }

    //方法：有什么需求就写什么方法
    //需求1：展示出全部电影的信息
        //不需要传参数 返回值为void
    public void printAllMovies(){
        System.out.println("以下是电影院所有电影信息：");
        for(int i = 0; i<movies.length; i++){
            System.out.println("-------------------------");
            System.out.println(movies[i].getId());
            System.out.println(movies[i].getName());
            System.out.println(movies[i].getActors());
            System.out.println(movies[i].getInfo());
            System.out.println(movies[i].getPrice());
            System.out.println(movies[i].getDirector());
            System.out.println(movies[i].getScore());
        }
    }

    //需求2：根据id查询电影
        //参数 id；返回值为void
    public void selectMovie(int id){
        for(int i = 0;i < movies.length;i++){
            //id和数组下标不一样，不能直接拿接收的参数和数组下标进行比较
            if(id == movies[i].getId()){
                System.out.println(movies[i].getId());
                System.out.println(movies[i].getName());
                System.out.println(movies[i].getActors());
                System.out.println(movies[i].getPrice());
                return;//非常巧妙，找到了就不在执行循环，直接结束整个方法
            }
        }
        System.out.println("您输入的电影id有误");
    }
}

Test.java

import java.util.Scanner;

public class Test {
    public static void main(String[] args) {
        //写一个电影数组
        Movie[] movies = new Movie[4];

        //每一个数组对象 都是一个movie类型的对象，所以要new
        movies[0] = new Movie(1, "《热辣苦瓜》", 36.9, 8.8, "甄玲", "张三，里斯", "年度好片"){};
        movies[1] = new Movie(2, "《热辣西瓜》", 48.9, 9.8, "甄玲", "张三，瓦内", "年度超好片"){};
        movies[2] = new Movie(3, "《热辣甜瓜》", 25.3, 6.8, "甄玲", "张三，王五", "年度烂片"){};
        movies[3] = new Movie(4, "《热辣蜜瓜》", 36.9, 3.8, "甄玲", "张三，二狗", "年度动作片"){};

        //创建一个业务控制器类
        MovieOperator operator = new MovieOperator(movies);
        //operator.printAllMovies();
        //System.out.println("----------");
      // operator.selectMovie(1);
        //到上面结束已经完成了基本的功能，下面写一下交互 正规一点的

        System.out.println("----------欢迎来到电影院------------");
        Scanner sc = new Scanner(System.in);
        while(true) {
            System.out.println("输入1查看所有影片；输入2根据id查找电影；输入3退出程序~~~");
            int num = sc.nextInt();
            switch(num) {
                case 1:
                    operator.printAllMovies();
                    break;
                case 2:
                    System.out.println("请输入想要查询的电影id：");
                    int id = sc.nextInt();
                    operator.selectMovie(id);
                    break;
                case 3:
                    System.out.println("退出程序。");
                    return;
                default:
                    System.out.println("您输入的命令有问题，请检查后再输入~~~");
                    break;
            }
        }
    }
}