import java.io.File;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

public class ZipCompressionRatio {
    public static void main(String[] args) {
        try {
            File file = new File("example.zip");
            ZipFile zipFile = new ZipFile(file);
            double uncompressedSize = 0.0;
            double compressedSize = 0.0;

            for (ZipEntry entry : zipFile.stream()) {
                uncompressedSize += entry.getSize();
                compressedSize += entry.getCompressedSize();
            }

            double compressionRatio = (compressedSize / uncompressedSize) * 100;
            System.out.println("압축 비율: " + compressionRatio + "%");
            zipFile.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}