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GZIP compress by GZIPOutputStream

import java.io.BufferedOutputStream; import java.io.BufferedReader; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.FileReader; import java.io.IOException; import java.io.InputStreamReader; import java.util.zip.GZIPInputStream; import java.util.zip.GZIPOutputStream; public class GZIPcompress {   public static void main(String[] args) throws IOException {     if (args.length == 0) {       System.out.println("Usage: \nGZIPcompress file\n" + "\tUses GZIP compression to compress "           + "the file to test.gz");       System.exit(1);     }     BufferedReader in = new BufferedReader(new FileReader(args[0]));     BufferedOutputStream out = new BufferedOutputStream(new GZIPOutputStream(new FileOutputStream(         "test.gz")));     System.out.println("Writing file");     int c;     while ((c = in.read()) != -1)       out.write(c);     in.close();     out.close();     System.out.println("Reading file");     BufferedReader in2 = new BufferedReader(new InputStreamReader(new GZIPInputStream(         new FileInputStream("test.gz"))));     String s;     while ((s = in2.readLine()) != null)       System.out.println(s);   } }