how can we remove blank lines from a .txt

[Camden]

Copy a file to another file removing all blank lines.

Typical Input
Here is an

input text with just two

blank lines.

Typical Output
Here is an
input text with just two
blank lines.

coding till now (im using acm library, dont pay attention on readLine()):

Code:

String inputFile = readLine("Insert file: ");
            BufferedReader inputFileReader = new BufferedReader(new FileReader(inputFile));
            String inputFileLine;
            String NewFile = readLine("Insert file name of the new file: ");
    		PrintWriter outputFile=new PrintWriter (new FileWriter(NewFile));
    		while((inputFileLine = inputFileReader.readLine()) != null) {
           	char [] characters= inputFileLine.toCharArray();
           	for (int i=0; i<characters.length; i++){
            	 outputFile.print(characters[i]);
                     }
            outputFile.println("");
            } 
            inputFileReader.close();
            outputFile.close();

[hardwired]

Code:

import java.io.*;
import java.util.Scanner;

public class IOTest {
    public static void main(String[] args) throws IOException {
        Scanner scanner = new Scanner(System.in);
        System.out.println("Insert file: ");
        String inputFile = //scanner.nextLine();
                           "ioTestIn.txt";
        BufferedReader inputFileReader = new BufferedReader(
                                         new FileReader(inputFile));
        String inputFileLine;
        System.out.println("Insert file name of the new file: ");
        String NewFile = //scanner.nextLine();
                         "ioTestOut.txt";
        scanner.close();
        PrintWriter outputFile = new PrintWriter(new FileWriter(NewFile));
        while((inputFileLine = inputFileReader.readLine()) != null) {
            if(inputFileLine.length() == 0)
                continue;
            outputFile.println(inputFileLine);
        } 
        inputFileReader.close();
        outputFile.close();
    }
}

ioTestIn.txt

Code:

Here is an 

input text with just two 

blank lines.