The setLevel() function of the Deflater class in java.util.zip sets the current compression level to the specified value. The compression level is an integer value from 0 to 9.
Function Signature:
public void setLevel(int level)
Syntax:
d.setLevel(int);
Parameter: The function requires an integer value which is the specified compression value
Return Type: The function does not return any value.
Exception: The function throws IllegalArgumentException if the compression level is invalid.
Some constant values for deflater levels :
Example 1:
// Java program to describe the use // of setLevel() function import java.util.zip.*;
import java.io.UnsupportedEncodingException;
class GFG {
// Function to compress the string to the given level
static void compression( int level, String text)
throws UnsupportedEncodingException
{
// deflater
Deflater d = new Deflater(level);
// 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 with level ="
+ level + " :"
+ new String(output)
+ "\n Size " + size);
d.end();
}
// Driver code
public static void main(String args[])
throws UnsupportedEncodingException
{
// get the text
String pattern = "GeeksforGeeks" , text = "" ;
// generate the text
for ( int i = 0 ; i < 4 ; i++)
text += pattern;
// original String
System.out.println( "Original String :" + text
+ "\n Size " + text.length());
// default
compression(Deflater.DEFAULT_COMPRESSION, text);
// no compression
compression(Deflater.NO_COMPRESSION, text);
// Best compression
compression(Deflater.BEST_COMPRESSION, text);
// Best Speed
compression(Deflater.BEST_SPEED, text);
}
} |
Output:
Original String :GeeksforGeeksGeeksforGeeksGeeksforGeeksGeeksforGeeks Size 52 Compressed String with level =-1 :x?sOM?.N?/r???q?? Size 21 Compressed String with level =0 :x4??GeeksforGeeksGeeksforGeeksGeeksforGeeksGeeksforGeeks?? Size 63 Compressed String with level =9 :x?sOM?.N?/r???q?? Size 21 Compressed String with level =1 :xsOM?.N?/r?`?0?? Size 22
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/zip/Deflater.html#setLevel()