Help with ZipFile and ZipEntry!

So far, I know how to read the names inside the zip, but i don't have any idea about how to storage an especific file inside the zip (a.txt), in a File variable.

try{

FileInputStream ArchSelec = new FileInputStream(Dir);

ZipInputStream ZipS=new ZipInputStream(ArchSelec);

ZipFile zf = new ZipFile(Dir);

ZipEntry ze = new ZipEntry(Dir);

while((ze=ZipS.getNextEntry())!=null){

System.out.println(ze.getName());

System.out.println(ze.getSize());

}

ZipS.close();

}catch(Exception A){

JOptionPane.showMessageDialog(this, "Wrong File");

}