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import java.io.IOException;
import java.util.Date;
import java.util.Enumeration;
import java.util.jar.Attributes;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.zip.ZipEntry;
public class Main {
public static void main(String[] args) throws IOException {
JarFile jf = new JarFile("a.jar");
Enumeration e = jf.entries();
while (e.hasMoreElements()) {
JarEntry je = (JarEntry) e.nextElement();
System.out.println(je.getName());
long uncompressedSize = je.getSize();
long compressedSize = je.getCompressedSize();
long crc = je.getCrc();
int method = je.getMethod();
String comment = je.getComment();
System.out.println(new Date(je.getTime()));
System.out.println("from " + uncompressedSize + " bytes to "+ compressedSize);
if (method == ZipEntry.STORED) {
System.out.println("ZipEntry.STORED");
}
else if (method == ZipEntry.DEFLATED) {
System.out.println(ZipEntry.DEFLATED);
}
System.out.println("Its CRC is " + crc);
System.out.println(comment);
System.out.println(je.isDirectory());
Attributes a = je.getAttributes();
if (a != null) {
Object[] nameValuePairs = a.entrySet().toArray();
for (int j = 0; j < nameValuePairs.length; j++) {
System.out.println(nameValuePairs[j]);
}
}
System.out.println();
}
}
}
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