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class 가수 {… class Trot extends 가수 {… class K_Pop extends 가수 {…

class 가수 {… class Trot extends 가수 {… class K_Pop extends 가수 {…. t. Trot t = new Trot(); t .name = “ 태진아 ” t .sing ();. k. K_Pop k = new K_Pop (); k .name = “ 소녀시대 ” k .sing (); k .dance ();. public static void main(String[] args ){

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class 가수 {… class Trot extends 가수 {… class K_Pop extends 가수 {…

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  1. class 가수{… class Trot extends 가수{… class K_Pop extends 가수{…

  2. t Trott = new Trot(); t.name = “태진아” t.sing();

  3. k K_Popk = new K_Pop(); k.name = “소녀시대” k.sing(); k.dance();

  4. public static void main(String[] args){ ArrayList<가수> star = new ArrayList<가수>(); star.add( new Trot() ); star.get(0).name = “태진아”; star.add( new K_Pop() ); star.get(1).name = “소녀시대”;

  5. public static void main(String[] args){ ArrayList<가수> star = new ArrayList<가수>(); star.get(1).sing(); star star.get(1).dance();

  6. for( 가수 k : star ){ k.sing(); if( k instanceofK_Pop ){ ((K_Pop) k).dance(); } } downcasting

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