How to save data from a “For Loop” into a compressed “.txt” file

I am trying to write a java code to save data from a “For Loop” (2d array named “arr”) into a compressed “.txt” file.

FileOutputStream fos = new FileOutputStream(path to zip file);
ZipOutputStream zipOut = new ZipOutputStream(new BufferedOutputStream(fos));
ZipEntry ze = new ZipEntry(path txt file);
zipOut.putNextEntry(ze);
for (int r = 0; r < 1048577; r++) {
    for (int c = 0; c < 25; c++) {
        zipOut.write(arr[r][c] + ","); // how do I write this line?
    }

    zipOut.write("n"); // how do I write this line?
}

zipOut.closeEntry();
zipOut.close();

What piece of code should be added to convert the result into Bytes and then use “ZipOutputStream” to write data into a compressed “.txt” file?

Thanks.

Answer

import java.util.*;
import java.io.*;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class Main {
    public static void main(String[] args) {
        FileOutputStream fos = null;
        ZipOutputStream zipOut = null;
        ZipEntry ze = null;
        try {
            char[][] arr = {{'a', 'b'}, {'d', 'c'}};
            fos = new FileOutputStream("a.zip");
            zipOut = new ZipOutputStream(new BufferedOutputStream(fos));
            ze = new ZipEntry("out.txt");
            zipOut.putNextEntry(ze);
            StringBuilder sb = new StringBuilder();
            for (int r = 0; r < arr.length; r++) {
                for (int c = 0; c < arr[0].length; c++) {
                    sb.append(arr[r][c]).append(",");
                }

                sb.append("n"); // how do I write this line?
            }
            zipOut.write(sb.toString().getBytes());
            zipOut.closeEntry();
            zipOut.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

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