String data = "Lorem ipsum dolor sit amet, DATA consetetur sadipscing elitr, \n" +
"DATA sed diam nonumy eirmod tempor invidunt ut labore et \n" +
"\n" +
"\n" +
"dolore magna aliquyam erat, sed diam voluptua. At \n" +
"DATA vero eos et DATA accusam et justo duo dolores et ea rebum. \n" +
"\n" +
"Stet clita kasd gubergren, no sea takimata sanctus est \n" +
"Lorem ipsum dolor DATA sit amet.\n";
Scanner scanner = new Scanner(data);
String line = "";
while(scanner.hasNextLine() && (line = scanner.nextLine()) != null) {
if(line.startsWith("DATA")) {
System.out.println("Do something... [" + line + "]");
}
}