텔레비전 채널, 볼륨 조절 (자바의정석 6-21)

import java.util.Scanner;

public class Television {

public static void main(String[] args) {

// TODO Auto-generated method stub

System.out.println("TV 리모컨");

MyTv mt = new MyTv();

mt.turnOnOff();

System.out.println("1. Channel Up");

System.out.println("2. Channel Down");

System.out.println("3. Volume Up");

System.out.println("4. Volume Down");

while (true) {

Scanner scan = new Scanner(System.in);

int temp = scan.nextInt();

switch (temp) {

case 1:

mt.channelUp();

break;

case 2:

mt.channelDown();

break;

case 3:

mt.volumeDown();

break;

case 4:

mt.volumeUp();

break;

default:

break;

}

printCurTvState(mt.channel, mt.volume);

}

}

static void printCurTvState(int c, int v) {

System.out.println("Ch : " + c + ", Vol : " + v);

}

}

class MyTv {

boolean isPowerOn;

int channel;

int volume;

final int MAX_VOLUME = 100;

final int MIN_VOLUME = 0;

final int MAX_CHANNEL = 100;

final int MIN_CHANNEL = 1;

MyTv() {

channel = 50;

volume = 24;

}

void turnOnOff() {

if (isPowerOn)

isPowerOn = false;

else

isPowerOn = true;

}

void volumeUp() {

if (volume < MAX_VOLUME)

volume++;

}

void volumeDown() {

if (volume > MIN_VOLUME)

volume--;

}

void channelUp() {

if (channel < MAX_CHANNEL)

channel++;

}

void channelDown() {

if (channel > MIN_CHANNEL)

channel--;

}

}