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import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
public class Main {
public static void main(String[] args) throws IOException {
String outputFile = "a.zip";
int level = 9;
FileOutputStream fout = new FileOutputStream(outputFile);
ZipOutputStream zout = new ZipOutputStream(fout);
zout.setLevel(level);
ZipEntry ze = new ZipEntry("a.zip");
FileInputStream fin = new FileInputStream("b.dat");
zout.putNextEntry(ze);
for (int c = fin.read(); c != -1; c = fin.read()) {
zout.write(c);
}
fin.close();
zout.close();
}
}
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