import net.lingala.zip4j.ZipFile;
import net.lingala.zip4j.exception.ZipException;
import java.io.IOException;

public class SampleClass{

public static void main(String[] args)
throws ZipException,
IOException{
ZipFile zip = null;

try{
zip = new ZipFile
("myzip.zip");
zip.renameFile
("image1.jpg", "img1.jpg");
}
finally{
if(zip != null)
zip.close();
}

System.out.println("main thread end.");
}
}