how to set charset utf-8 in zip4j without charset function?

I want extract zip file with utf-8 ,but there not's zipfile.setcharset function in 2.1.2 version.

public void unZipFiles(File zipfile, String descDir) {
    try {
        ZipFile zfile = new ZipFile(zipfile);

        // zfile.setcharset
        zfile.extractAll(descDir);
    } catch (ZipException e) {
        e.printStackTrace();
    }
}