String mssg_1 = null ;
String upc =
"\n" +"Kode Barang : 03"+"\n"
+ "Nomor Klassifikasi : klas1"+"\n"
+ "Judul Koleksi : kol03"+"\n"
+ "Penulis : Dedi" +"\n"
+ "Penerbit : Gramedia";

StringTokenizer str = new StringTokenizer(upc, " :");
while (str.hasMoreElements()) {
System.out.println(str.nextElement());
// System.out.println("count tokens : " + str.countTokens());
if (str.countTokens() == 8) {

System.out.println("hasil --> " + str.nextElement().toString());
// cara copy value str.nextElement().toString() ke String mssg_1

}

}