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());
}
}
} |
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());
}
}
} |
Crc : 3528251335
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/zip/ZipEntry.html#getCrc–