Quản lý phòng tập GYM - Java basic

#Ve.java

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package bt1167;

import java.util.Scanner;

/**
 *
 * @author Diep.Tran
 */
public class Ve implements IInputOutput{
    String customerName, buyDate, expiredDate;

    public Ve() {
    }
    
    @Override
    public void input() {
        Scanner scan = new Scanner(System.in);
        
        System.out.println("Nhap ten KH: ");
        customerName = scan.nextLine();
        System.out.println("Nhap ngay mua: ");
        buyDate = scan.nextLine();
        System.out.println("Nhap ngay het han: ");
        expiredDate = scan.nextLine();
    }

    @Override
    public void display() {
        System.out.println(this);
    }

    @Override
    public String toString() {
        return "customerName=" + customerName + ", buyDate=" + buyDate + ", expiredDate=" + expiredDate;
    }
    
    public String getCustomerName() {
        return customerName;
    }

    public void setCustomerName(String customerName) {
        this.customerName = customerName;
    }

    public String getBuyDate() {
        return buyDate;
    }

    public void setBuyDate(String buyDate) {
        this.buyDate = buyDate;
    }

    public String getExpiredDate() {
        return expiredDate;
    }

    public void setExpiredDate(String expiredDate) {
        this.expiredDate = expiredDate;
    }
}

#Main.java

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package bt1167;

/**
 *
 * @author Diep.Tran
 */
public class Main {
    public static void main(String[] args) {
        DataMgr dataMgr = new DataMgr();
        
        dataMgr.input();
        
        dataMgr.display();
    }
}

#IInputOutput.java

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package bt1167;

/**
 *
 * @author Diep.Tran
 */
public interface IInputOutput {
    void input();
    void display();
}

#DungCu.java

/*
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package bt1167;

import java.util.Scanner;

/**
 *
 * @author Diep.Tran
 */
public class DungCu implements IInputOutput{
    String name, status, type;

    public DungCu() {
    }
    
    @Override
    public void input() {
        Scanner scan = new Scanner(System.in);
        
        System.out.println("Nhap ten: ");
        name = scan.nextLine();
        System.out.println("Nhap trang thai: ");
        status = scan.nextLine();
        System.out.println("Nhap loai: ");
        type = scan.nextLine();
    }

    @Override
    public void display() {
        System.out.println(this);
    }

    @Override
    public String toString() {
        return "name=" + name + ", status=" + status + ", type=" + type;
    }
    
    public String getName() {
        return name;
    }

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

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }
    
    
}

#DoUong.java

/*
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package bt1167;

import java.util.Scanner;

/**
 *
 * @author Diep.Tran
 */
public class DoUong implements IInputOutput{
    String name;
    float price;

    public DoUong() {
    }
    
    @Override
    public void input() {
        Scanner scan = new Scanner(System.in);
        
        System.out.println("Nhap ten: ");
        name = scan.nextLine();
        System.out.println("Nhap gia: ");
        price = Float.parseFloat(scan.nextLine());
    }

    @Override
    public void display() {
        System.out.println(this);
    }

    @Override
    public String toString() {
        return "name=" + name + ", price=" + price;
    }
    
    public String getName() {
        return name;
    }

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

    public float getPrice() {
        return price;
    }

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

#DataMgr.java

/*
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 */
package bt1167;

import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;

/**
 *
 * @author Diep.Tran
 */
public class DataMgr implements IInputOutput{
    ArrayList<IInputOutput> dataList;

    public DataMgr() {
        dataList = new ArrayList<>();
    }

    public ArrayList<IInputOutput> getDataList() {
        return dataList;
    }

    public void setDataList(ArrayList<IInputOutput> dataList) {
        this.dataList = dataList;
    }

    @Override
    public void input() {
        Scanner scan = new Scanner(System.in);
        
        System.out.println("Nhap so doi tuong can them: ");
        int N = Integer.parseInt(scan.nextLine());
        
        Random random = new Random();
        
        for (int i = 0; i < N; i++) {
            int rad = random.nextInt(2);
            
            IInputOutput io;
            switch(rad) {
                case 0:
                    System.out.println("Nhap thong tin dung cu: ");
                    io = new DungCu();
                    break;
                case 1:
                    System.out.println("Nhap thong tin do uong: ");
                    io = new DoUong();
                    break;
                default:
                    System.out.println("Nhap thong tin ve: ");
                    io = new Ve();
                    break;
            }
            
            io.input();
            
            dataList.add(io);
        }
    }

    @Override
    public void display() {
        System.out.println("Thong tin dung cu: ");
        for (IInputOutput io : dataList) {
            io.display();
        }
    }
}