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Java ZipEntry getCrc() function with examples

  • Last Updated : 06 Mar, 2019


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






// 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());
        }
    }
}
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




// 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());
        }
    }
}
Output:
Crc : 3528251335

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

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