Java ZipEntry getCrc() function with examples


The getCrc() function is a part of java.util.zip package. The function returns the CRC – 32 checksum value of a specific ZipEntry .
The CRC is an error detecting code used to detect error in raw data.
Function Signature :

public long getCrc()

Syntax :

zip_entry.getCrc();

Parameters :No parameter is required for this function.
Return value :The function returns a long value, the Crc of this ZipEntry.
Exceptions :The function does not throw any exception.0



Below programs illustrates the use of getCrc() function

Example 1: We will create a file named zip_file and get the zip file entry using getEntry() function and then get the CRC-32 of the specified ZipEntry.”file.zip” is a zip file present in f: directory. we will take a “.zip” file as ZipEntry

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java program to demonstrate the
// use of getCrc() function
  
import java.util.zip.*;
import java.util.Enumeration;
import java.util.*;
import java.io.*;
  
public class solution {
    public static void main(String args[])
    {
        try {
            // Create a Zip File
            ZipFile zip_file = new ZipFile("f:\\file1.zip");
  
            // get the Zip Entry using
            // the getEntry() function
            ZipEntry entry = zip_file.getEntry("file.zip");
  
            // Get the Crc
            // using the getCrc()
            // function
            long input = entry.getCrc();
  
            // Display the Crc
            System.out.println("Crc : " + input);
        }
        catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }
}

chevron_right


Output:

Crc : 1798120178

Example 2: We will create a file named zip_file and get the zip file entry using getEntry() function and then get the CRC-32 of the specified ZipEntry.”file.zip” is a zip file present in f: directory. we will take a “.cpp” file as ZipEntry

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java program to demonstrate the
// use of getCrc() function
  
import java.util.zip.*;
import java.util.Enumeration;
import java.util.*;
import java.io.*;
  
public class solution {
    public static void main(String args[])
    {
        try {
            // Create a Zip File
            ZipFile zip_file = new ZipFile("f:\\file1.zip");
  
            // get the Zip Entry using
            // the getEntry() function
            ZipEntry entry = zip_file.getEntry("file1.cpp");
  
            // Get the Crc
            // using the getCrc()
            // function
            long input = entry.getCrc();
  
            // Display the Crc
            System.out.println("Crc : " + input);
        }
        catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }
}

chevron_right


Output:

Crc : 3528251335

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/zip/ZipEntry.html#getCrc–



My Personal Notes arrow_drop_up

Second year Department of Information Technology Jadavpur University

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.