MainClass.java Source code

Introduction

Here is the source code for MainClass.java

Source

import java.io.IOException;
import java.util.Date;
import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.zip.ZipEntry;

public class MainClass {

    public static void main(String[] args) throws IOException {

        JarFile jf = new JarFile(args[0]);
        Enumeration e = jf.entries();
        while (e.hasMoreElements()) {
            JarEntry je = (JarEntry) e.nextElement();
            String name = je.getName();
            Date lastModified = new Date(je.getTime());
            long uncompressedSize = je.getSize();
            long compressedSize = je.getCompressedSize();

            int method = je.getMethod();

            if (method == ZipEntry.STORED) {
                System.out.println(name + " was stored at " + lastModified);
                System.out.println("with a size of  " + uncompressedSize + " bytes");
            } else if (method == ZipEntry.DEFLATED) {
                System.out.println(name + " was deflated at " + lastModified);
                System.out.println("from  " + uncompressedSize + " bytes to " + compressedSize
                        + " bytes, a savings of " + (100.0 - 100.0 * compressedSize / uncompressedSize) + "%");
            } else {
                System.out.println(name + " was compressed using an unrecognized method at " + lastModified);
                System.out.println("from  " + uncompressedSize + " bytes to " + compressedSize
                        + " bytes, a savings of " + (100.0 - 100.0 * compressedSize / uncompressedSize) + "%");
            }
        }
    }
}