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Create a compressed data file by using a DeflaterOutputStream and then read that data through an InflaterInputStream

import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.FileInputStream; import java.io.FileOutputStream; import java.util.zip.DeflaterOutputStream; import java.util.zip.InflaterInputStream; public class Main {   public static void main(String[] argv) throws Exception {     double data[] = { 1.1, 2.2, 3.3, 4.4, 5.5, 6.6 };     DataOutputStream fout = new DataOutputStream(new DeflaterOutputStream(new FileOutputStream(         "data.dat")));     fout.writeInt(data.length);     for (double d : data)       fout.writeDouble(d);     DataInputStream  fin = new DataInputStream(new InflaterInputStream(new FileInputStream(         "data.dat")));     int num = fin.readInt();     double avg = 0.0;     double d;     for (int i = 0; i < num; i++) {       d = fin.readDouble();       avg += d;       System.out.print(d + " ");     }     fin.close();     fout.close();   } }