feat(class15, class16): 添加电影管理和静态方法相关代码

- 新增 Movie 类和 MovieOperator 类，实现电影信息管理和查询功能
- 添加 Student 类和 Test 类，演示静态方法的使用- 实现 VerifyCodeUtil 工具类，生成验证码
- 添加多个测试类，验证各功能模块的正确性

src/class15/staticmethod/Student.java

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+package class15.staticmethod;
+
+public class Student {
+    private double score;
+    public static void printHelloWorld(){
+        System.out.println("Hello World");
+        System.out.println("Hello World");
+        System.out.println("Hello World");
+    }
+    public void printPass(){
+        System.out.println(this.score>=60?"通过":"未通过");
+    }
+    public void setScore(double score){
+        this.score = score;
+    }
+}

src/class15/staticmethod/Test.java

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+package class15.staticmethod;
+
+public class Test {
+    public static void main(String[] args) {
+        Student.printHelloWorld();
+        Student s1 = new Student();
+        s1.setScore(90);
+        s1.printPass();
+    }
+}

src/class15/staticmethod/Test2.java

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+package class15.staticmethod;
+
+public class Test2 {
+    public static void main(String[] args) {
+        System.out.println(VerifyCodeUtil.getCode(6));
+    }
+}

src/class15/staticmethod/Test4.java

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+package class15.staticmethod;
+
+public class Test4 {
+    public static void main(String[] args) {
+
+    }
+}

src/class15/staticmethod/VerifyCodeUtil.java

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+package class15.staticmethod;
+
+public class VerifyCodeUtil {
+//    工具类不需要实例化，只需要定义静态方法，故需将构造方法私有化
+    private VerifyCodeUtil(){}
+    public static String getCode(int n)
+    {
+        //传入n为验证码长度，生成数字、大小写字母混合验证码
+        String code = "";
+        for(int i = 0; i < n; i++){
+            int flag = (int)(Math.random()*3);
+            switch (flag){
+                case 0:
+                    code += (char)(Math.random()*10+'0');
+                    break;
+                case 1:
+                    code += (char)(Math.random()*26+'a');
+                    break;
+                case 2:
+                    code += (char)(Math.random()*26+'A');
+                    break;
+            }
+        }
+        return code;
+    }
+}

src/class16/Movie.java

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+package class16;
+
+public class Movie {
+    private int id ;
+    private String name ;
+    private double price;
+    private String actor;
+
+    public Movie(int id, String actor, double price, String name) {
+        this.id = id;
+        this.actor = actor;
+        this.price = price;
+        this.name = name;
+    }
+
+    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 String getActor() {
+        return actor;
+    }
+
+    public void setActor(String actor) {
+        this.actor = actor;
+    }
+}

src/class16/MovieOperator.java

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+package class16;
+
+import java.util.Scanner;
+
+public class MovieOperator {
+
+    private Movie[] movies;
+
+    public MovieOperator(Movie[] movies) {
+        this.movies = movies;
+    }
+
+    public void printAllMovies() {
+        for (Movie movie : movies) {
+            System.out.println(movie.getId() + "\t" + movie.getName() + "\t" + movie.getPrice() + "\t" + movie.getActor());
+            System.out.println("------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------");
+        }
+    }
+
+    public void searchMovieById() {
+        System.out.println("请输入要查询的id：");
+        Scanner sc = new Scanner(System.in);
+        int id = sc.nextInt();
+        for (Movie movie : movies) {
+            if (movie.getId() == id) {
+                System.out.println(movie.getId() + "\t" + movie.getName() + "\t" + movie.getPrice() + "\t" + movie.getActor());
+                return;
+            }
+        }
+        System.out.println("没有找到该id对应的电影！");
+    }
+}

src/class16/Test.java

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+package class16;
+
+public class Test {
+    public static void main(String[] args) {
+        Movie[] movies = new Movie[6];
+        //movies = [null, null, null, null, null, null];
+        //           0     1     2     3     4     5
+        movies[0] = new Movie(1,"星际穿越", 9.6,"安妮海瑟薇");
+        movies[1] = new Movie(2,"唐顿庄园", 9.5,"维维SOURCE");
+        movies[2] = new Movie(3,"唐顿庄园2", 9.5,"维维SOURCE");
+        movies[3] = new Movie(4,"唐顿庄园3", 9.5,"维维SOURCE");
+        movies[4] = new Movie(5,"唐顿庄园4", 9.5,"维维SOURCE");
+        movies[5] = new Movie(6,"唐顿庄园5", 9.5,"维维SOURCE");
+
+        MovieOperator mo = new MovieOperator(movies);
+        mo.printAllMovies();
+        mo.searchMovieById();
+    }
+}