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Read a zip file checksum value

import java.io.BufferedInputStream; import java.io.BufferedOutputStream; import java.io.FileInputStream; import java.io.FileOutputStream; import java.util.zip.Adler32; import java.util.zip.CheckedInputStream; import java.util.zip.ZipEntry; import java.util.zip.ZipInputStream; public class Main {   public static void main(String[] args) throws Exception {     String zipname = "d.zip";     CheckedInputStream checksum = new CheckedInputStream(         new FileInputStream(zipname), new Adler32());     ZipInputStream zis = new ZipInputStream(new BufferedInputStream(checksum));     ZipEntry entry;     while ((entry = zis.getNextEntry()) != null) {       System.out.println("Unzipping: " + entry.getName());       int size;       byte[] buffer = new byte[2048];       BufferedOutputStream bos = new BufferedOutputStream(           new FileOutputStream(entry.getName()), buffer.length);       while ((size = zis.read(buffer, 0, buffer.length)) != -1) {         bos.write(buffer, 0, size);       }       bos.flush();       bos.close();     }     zis.close();     System.out.println("Checksum = " + checksum.getChecksum().getValue());   } }