자바 인코딩 깨질 때

요거 중에 하난 걸린다!!!!!!!!!!!!!!!!!!!!!!!

String mydoc = "";
System.out.println("=========1==============");
System.out.println(new String((mydoc.toString()).getBytes("KSC5601"), "8859_1"));
System.out.println("=========2==============");
System.out.println(new String((mydoc.toString()).getBytes("KSC5601"), "EUC-KR"));
System.out.println("=========3==============");
System.out.println(new String((mydoc.toString()).getBytes("8859_1"), "EUC-KR"));
System.out.println("=========4==============");
System.out.println(new String((mydoc.toString()).getBytes("8859_1"), "KSC5601"));
System.out.println("=========5==============");
System.out.println(new String((mydoc.toString()).getBytes("EUC-KR"), "KSC5601"));
System.out.println("=========6==============");
System.out.println(new String((mydoc.toString()).getBytes("EUC-KR"), "8859_1"));
System.out.println("=========7==============");
System.out.println(new String((mydoc.toString()).getBytes("UTF-8"), "KSC5601"));
System.out.println("=========8==============");
System.out.println(new String((mydoc.toString()).getBytes("UTF-8"), "8859_1"));
System.out.println("=========9==============");
System.out.println(new String((mydoc.toString()).getBytes("UTF-8"), "EUC-KR"));
System.out.println("=========10==============");
System.out.println(new String((mydoc.toString()).getBytes("KSC5601"), "UTF-8"));
System.out.println("=========11==============");
System.out.println(new String((mydoc.toString()).getBytes("8859_1"), "UTF-8"));
System.out.println("=========12==============");
System.out.println(new String((mydoc.toString()).getBytes("EUC-KR"), "UTF-8"));
System.out.println("=======================");