摘要：
import java.util.*;public class ObjectTestDrive { public static void main(String[] args) { ArrayList<Animal> alist = new ArrayList<Animal>(); Dog d = new Dog(); alist.add(d); Animal a = alist.get(0); a.yield(); System.out.println(a instanceof Dog); }}c... 阅读全文
摘要：
1、How do I install .deb file?To install package called package.deb type the following command: Go to directory where package.deb is kept. For example if it is in /tmp directory:$ cd /tmp$ sudo dpkg -i package.deb 阅读全文