Java basic- Overview - viết chương trình điều khiển TIVI bằng java

#cTivi.java

/*
 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */
package com.gokisoft.c2209i;

/**
 *
 * @author teacher
 */
public class cTivi {
    private String[] channelList;
    private boolean isOn;
    private String currentChannel;
    private int currentIndex = -1;

    public cTivi() {
        isOn = false;
        channelList = new String[]{"VTV1", "VTV2", "VTV3"};
        currentChannel = "VTV1";
        currentIndex = 0;
    }

    public cTivi(String[] channelList) {
        this.channelList = channelList;
        isOn = false;
        if(channelList.length > 0) {
            currentChannel = channelList[0];
            currentIndex = 0;
        }
    }
    
    private String seachNextChannel(boolean isForward) {
        if(channelList.length == 0) return "";
        if(isForward) {
            currentIndex++;
            if(currentIndex >= channelList.length) {
                currentIndex = 0;
            }
        } else {
            currentIndex--;
            if(currentIndex < 0) {
                currentIndex = channelList.length - 1;
            }
        }
        
        currentChannel = channelList[currentIndex];
        return currentChannel;
    }
    
    void On() {
        isOn = true;
        System.out.println("=== Tivi ON ===");
    }
    
    void Off() {
        isOn = false;
        System.out.println("=== Tivi OFF ===");
    }
    
    void Switch() {
        if(isOn) {
            Off();
        } else {
            On();
        }
    }
    
    void Switch(String channel) {
        Switch();
        if(isOn) {
            boolean isFind = false;
            for (int i = 0; i < channelList.length; i++) {
                if(channelList[i].equalsIgnoreCase(channel)) {
                    currentIndex = i;
                    isFind = true;
                    currentChannel = channelList[i];
                    break;
                }
            }
            if(!isFind) {
                System.out.println("Khong tim thay channel: " + channel);
            }
        }
    }
    
    void nextChannel() {
        if(isOn) {
            seachNextChannel(true);
        } else {
            System.out.println("=== Tivi OFF ===");
        }
    }
    
    void previousChannel() {
        if(isOn) {
            seachNextChannel(false);
        } else {
            System.out.println("=== Tivi OFF ===");
        }
    }
    
    void Show() {
        if(isOn) {
            System.out.println("=== Tivi is on at channel: " + currentChannel);
        } else {
            System.out.println("=== Tivi is OFF");
        }
    }

    public String[] getChannelList() {
        return channelList;
    }

    public void setChannelList(String[] channelList) {
        this.channelList = channelList;
    }

    public boolean isIsOn() {
        return isOn;
    }

    public void setIsOn(boolean isOn) {
        this.isOn = isOn;
    }

    public String getCurrentChannel() {
        return currentChannel;
    }

    public void setCurrentChannel(String currentChannel) {
        this.currentChannel = currentChannel;
    }

    public int getCurrentIndex() {
        return currentIndex;
    }

    public void setCurrentIndex(int currentIndex) {
        this.currentIndex = currentIndex;
    }
    
    
}

#Main.java

/*
 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */
package com.gokisoft.c2209i;

import java.util.Scanner;

/**
 *
 * @author teacher
 */
public class Main {

    public static void main(String[] args) {
        cTivi tivi;

        Scanner scan = new Scanner(System.in);
        int choose;

        System.out.println("1. Khoi tao Tivi mac dinh");
        System.out.println("2. Khoi tao Tivi thiet lap kenh");
        System.out.println("Chon: ");
        choose = Integer.parseInt(scan.nextLine());

        switch (choose) {
            case 1:
                tivi = new cTivi();
                break;
            default: {
                System.out.println("Nhap so kenh can them: ");
                int n = Integer.parseInt(scan.nextLine());
                String[] channelList = new String[n];

                for (int i = 0; i < n; i++) {
                    System.out.println("Nhap kenh: ");
                    String c = scan.nextLine();
                    channelList[i] = c;
                }

                tivi = new cTivi(channelList);
                break;
            }
        }
        
        do {
            showMenu();
            choose = Integer.parseInt(scan.nextLine());
            
            switch (choose) {
                case 1:
                    tivi.Switch();
                    break;
                case 2:
                    System.out.println("Chon ken can chuyen: ");
                    String search = scan.nextLine();
                    
                    tivi.Switch(search);
                    break;
                case 3:
                    tivi.On();
                    break;
                case 4:
                    tivi.Off();
                    break;
                case 5:
                    tivi.nextChannel();
                    break;
                case 6:
                    tivi.previousChannel();
                    break;
                case 7:
                    tivi.Show();
                    break;
                case 8:
                    System.out.println("Thoat!!!");
                    break;
                default:
                    System.out.println("Nhap sai!!!");
                    break;
            }
        } while(choose != 8);
    }
    
    static void showMenu() {
        System.out.println("1. Chuyen trang thai");
        System.out.println("2. Chuyen trang thai theo kenh");
        System.out.println("3. Bat tivi");
        System.out.println("4. Tat tivi");
        System.out.println("5. Chuyen kenh tiep");
        System.out.println("6. Chuyen kenh truoc");
        System.out.println("7. Xem thong tin Tivi");
        System.out.println("8. Ke thuc");
        System.out.println("Chon:");
    }
}