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1、模擬斗地主

public class PlayCards {    public static void main(String[] args) {        String[] color = {"黑桃", "梅花", "方片", "紅桃"};        String[] num = {"A", "2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K"};        ArrayList<String> cards = new ArrayList<>();        //洗牌        for (int i = 0; i < color.length; i  ) {            for (int j = 0; j < num.length; j  ) {                cards.add(color[i]   num[j]);            }        }        cards.add("大王");        cards.add("小王");        Collections.shuffle(cards);        ArrayList<String> 林志玲 = new ArrayList<>();        ArrayList<String> 林心如 = new ArrayList<>();        ArrayList<String> 舒淇 = new ArrayList<>();        //留下3張底牌        for (int i = 0; i < cards.size() - 3; i  ) {            if (i % 3 == 0) {                林志玲.add(cards.get(i));            } else if (i % 3 == 1) {                林心如.add(cards.get(i));            } else if (i % 3 == 2) {                舒淇.add(cards.get(i));            }        }        System.out.println("林志玲："   林志玲);        System.out.println("林心如："   林心如);        System.out.println("舒淇："   舒淇);        System.out.println("底牌：");        for (int i = cards.size() - 3; i < cards.size(); i  ) {            System.out.println(cards.get(i));        }    }}

2、學(xué)生管理系統(tǒng) IO 版本

先在項目的根目錄下創(chuàng)建 student.txt,用戶存儲用戶輸入的信息。學(xué)生類:    public class Student {                private String id;        private String name;        private String age;        private String address;                // 空參和有參構(gòu)造方法        // getter、setter方法            }系統(tǒng)程序:    public class StudentManagerIO {        public static void main(String[] args) throws IOException {                String fileName = "student.txt";                //為了使主程序回到這里，使用循環(huán)            while (true) {                //學(xué)生管理系統(tǒng)主界面                System.out.println("----------歡迎來到學(xué)生管理系統(tǒng)----------");                System.out.println("1 查看所有學(xué)生");                System.out.println("2 添加學(xué)生");                System.out.println("3 刪除學(xué)生");                System.out.println("4 修改學(xué)生");                System.out.println("5 退出系統(tǒng)");                System.out.println("請輸入你的選擇：");                    //創(chuàng)建鍵盤錄入對象                Scanner scanner = new Scanner(System.in);                String choiceString = scanner.nextLine();                    //使用 Switch語句                switch (choiceString) {                    case "1":                        //查看所有學(xué)生                        findAllStudent(fileName);                        break;                    case "2":                        //添加學(xué)生                        addStudent(fileName);                        break;                    case "3":                        //刪除學(xué)生                        deleteStudent(fileName);                        break;                    case "4":                        //修改學(xué)生                        updateStudent(fileName);                        break;                    case "5":                        //退出                        System.out.println("謝謝你的使用");                        System.exit(0); //JVM退出                    default:                        System.out.println("你的輸入有誤，請重新選擇");                }            }        }            //從文件中讀取數(shù)據(jù)到集合        private static void readData(String fileName, ArrayList<Student> array) throws IOException {                BufferedReader reader = new BufferedReader(new FileReader(fileName));                String line;            while ((line = reader.readLine()) != null) {                String[] datas = line.split(",");                Student student = new Student();                student.setId(datas[0]);                student.setName(datas[1]);                student.setAddress(datas[2]);                student.setAddress(datas[3]);                    array.add(student);            }                reader.close();        }            //把集合中的數(shù)據(jù)寫入文件        private static void writeData(String fileName, ArrayList<Student> array) throws IOException {                BufferedWriter writer = new BufferedWriter(new FileWriter(fileName));                for (int i = 0; i < array.size(); i  ) {                Student student = array.get(i);                StringBuffer sb = new StringBuffer();                sb.append(student.getId()).append(",").append(student.getName()).append(",")                        .append(student.getAge()).append(",").append(student.getAddress());                    writer.write(sb.toString());                writer.newLine();                writer.flush();            }                writer.close();        }            //修改學(xué)生        public static void updateStudent(String fileName) throws IOException {                ArrayList<Student> array = new ArrayList<>();            readData(fileName, array);                Scanner sc = new Scanner(System.in);            System.out.println("請輸入你要修改的學(xué)生的學(xué)號：");            String id = sc.nextLine();                int index = -1;            for (int i = 0; i < array.size(); i  ) {                Student student = array.get(i);                if (student.getId().equals(id)) {                    index = i;                    break;                }            }                if (index == -1) {                System.out.println("不好意思,你要修改的學(xué)號對應(yīng)的學(xué)生信息不存在,請回去重新你的選擇");            } else {                System.out.println("請輸入學(xué)生新姓名：");                String name = sc.nextLine();                System.out.println("請輸入學(xué)生新年齡：");                String age = sc.nextLine();                System.out.println("請輸入學(xué)生新居住地：");                String address = sc.nextLine();                    Student student = new Student();                student.setId(id);                student.setName(name);                student.setAge(age);                student.setAddress(address);                    array.set(index, student);                writeData(fileName, array);                System.out.println("修改成功?。?！");            }        }            //刪除學(xué)生        public static void deleteStudent(String fileName) throws IOException {                ArrayList<Student> array = new ArrayList<>();            readData(fileName, array);                Scanner scanner = new Scanner(System.in);            System.out.println("請輸入需要刪除的學(xué)生學(xué)號：");            String id = scanner.nextLine();                int index = -1;            for (int i = 0; i < array.size(); i  ) {                Student student = array.get(i);                if (student.getId().equals(id)) {                    index = i;                    break;                }            }                if (index == -1) {                System.out.println("不好意思，你要刪除的學(xué)生信息不存在，請重新選擇");            } else {                array.remove(index);                writeData(fileName, array);                System.out.println("刪除成功?。?quot;);            }        }            //添加學(xué)生信息        public static void addStudent(String fileName) throws IOException {                ArrayList<Student> array = new ArrayList<>();            //從文件中讀取數(shù)據(jù)到集合            readData(fileName, array);                Scanner scanner = new Scanner(System.in);            String id;                while (true) {                System.out.println("請輸入學(xué)生學(xué)號：");                id = scanner.nextLine();                //判斷學(xué)號是否被占用                boolean flag = isExist(array, id);                if (flag) {                    System.out.println("對不起，你輸入的學(xué)號被占用，請重新輸入");                } else {                    break;                }            }                System.out.println("請輸入學(xué)生姓名：");            String name = scanner.nextLine();            System.out.println("請輸入學(xué)生年齡：");            String age = scanner.nextLine();            System.out.println("請輸入學(xué)生住址：");            String address = scanner.nextLine();                Student student = new Student();            student.setId(id);            student.setName(name);            student.setAge(age);            student.setAddress(address);                array.add(student);            writeData(fileName, array);            System.out.println("添加成功！！");        }            //判斷學(xué)號是否被占用        private static boolean isExist(List<Student> array, String id) {            for (int i = 0; i < array.size(); i  ) {                Student student = array.get(i);                if (student.getId().equals(id)) {                    return true;                }            }            return false;        }            //查看所有學(xué)生        public static void findAllStudent(String fileName) throws IOException {                ArrayList<Student> array = new ArrayList<>();            readData(fileName, array);                if (array.size() == 0) {                System.out.println("不好意思，暫時沒有學(xué)生信息可供查詢，請重新選擇");                return;            }                System.out.println("學(xué)號\t姓名\t年齡\t居住地");            array.forEach(student ->                    System.out.println(student.getId()   "\t"   student.getName()   "\t"                              student.getAddress()   "\t"   student.getAddress()                    )            );        }    }