[4 - 21] 1. 문제설명 2. 나의 해답 package ex6_21; public class Exercise6_21 { public static void main(String[] args) { // TODO Auto-generated method stub MyTv t = new MyTv(); t.channel = 100; t.volume = 0; System.out.println("CH:"+t.channel+", VOL:"+ t.volume); t.channelDown(); t.volumeDown(); System.out.println("CH:"+t.channel+", VOL:"+ t.volume); t.volume = 100; t.channelUp(); t.volumeUp(); System.out..
