Which class is used to compress files into ZIP format in Java?

Java MCQ: Which class is used to compress files into ZIP format in Java?

Answer:

Explanation:

The ZipOutputStream class in Java is used to compress files into the ZIP format. It is part of the java.util.zip package and provides methods to write compressed data to a ZIP file. The ZipOutputStream class is commonly used in conjunction with FileOutputStream to create a new ZIP file and add entries (files) to it.

Here’s an example of how to compress a file into a ZIP format using ZipOutputStream:

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class CompressFileToZIP {
    public static void main(String[] args) {
        try (FileOutputStream fos = new FileOutputStream("output.zip");
             ZipOutputStream zos = new ZipOutputStream(fos);
             FileInputStream fis = new FileInputStream("example.txt")) {

            ZipEntry zipEntry = new ZipEntry("example.txt");
            zos.putNextEntry(zipEntry);

            byte[] buffer = new byte[1024];
            int length;
            while ((length = fis.read(buffer)) >= 0) {
                zos.write(buffer, 0, length);
            }
            zos.closeEntry();
            System.out.println("File has been compressed into ZIP format.");
        } catch (IOException e) {
            System.out.println("An error occurred during file compression.");
            e.printStackTrace();
        }
    }
}

In this example, a ZipOutputStream is created to wrap a FileOutputStream that writes to output.zip. The file example.txt is then read using a FileInputStream, and its contents are written to the ZIP file as a new entry using the ZipEntry class.

Compression is a common requirement for reducing file size, particularly when transferring files over a network or storing them efficiently. The ZipOutputStream class is an essential tool for creating ZIP files in Java.

Reference links:

https://www.rameshfadatare.com/learn-java-programming/
https://www.javaguides.net/p/java-tutorial-learn-java-programming.html