package application;

import java.util.stream.Collectors;

public class Test {

	public static void main(String[] args) {
		String data = "A\r\nB\nC\rD";
		String st = ((String) data).replaceAll("(\r\n|\r|\n)", "\r\n");
		System.err.println(st.chars().mapToObj( c -> {
			if( c == '\r' ) {
				return "\\r";
			} else if( c == '\n' ) {
				return "\\n";
			}
			return String.valueOf((char)c);
		}).collect(Collectors.joining()));
	}

}