Deflater getAdler() function in Java with examples


The getAdler() function of the Deflater class in java.util.zip returns the Adler-32 value of the uncompressed data. Adler-32 is a checksum algorithm which is widely used zlib compression library.

Function Signature:

public int getAdler()

Syntax:



d.getAdler();

Parameter: The function requires no parameter

Return Type: The function returns an Integer value which is the Adler-32 value of the uncompressed data.

Exception: The function does not throw any exception

Example 1:

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// Java program to describe the use
// of finished() function
  
import java.util.zip.*;
import java.io.UnsupportedEncodingException;
  
class GFG {
    public static void main(String args[])
        throws UnsupportedEncodingException
    {
        // deflater
        Deflater d = new Deflater();
  
        // get the text
        String pattern = "GeeksforGeeks", text = "";
  
        // generate the text
        for (int i = 0; i < 4; i++)
            text += pattern;
  
        // set the input for deflator
        d.setInput(text.getBytes("UTF-8"));
  
        // finish
        d.finish();
  
        // output bytes
        byte output[] = new byte[1024];
  
        // compress the data
        int size = d.deflate(output);
  
        // compressed String
        System.out.println("Compressed String :"
                           + new String(output)
                           + "\n Size " + size);
  
        // original String
        System.out.println("Original String :" + text
                           + "\n Size " + text.length());
  
        // get Adler-32 value
        System.out.println("Adler-32 value :"
                           + d.getAdler());
  
        // end
        d.end();
    }
}

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Output:

Compressed String :x?sOM?.N?/r???q??
 Size 21
Original String :GeeksforGeeksGeeksforGeeksGeeksforGeeksGeeksforGeeks
 Size 52
Adler-32 value :511972501

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/zip/Deflater.html#getAdler()



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