java中类的继承与抽象类简明教程
package Karl.Doenitz;public class father {public int q;public father(){System.out.println(2);}public father(int k){System.out.println(k);} public int a(){ return 1; }}package Karl.Doenitz;public class son extends father{public son(){System.out.println(3);}public son(int k){System.out.println(k+"new");}public void fun(int p){son s = new son();s.q=p;System.out.println(s.q);} public static void main(String args[]){ son s = new son(); son ss = new son(7); int l = s.a(); s.fun(9); System.out.println(l); }}package Karl.Doenitz;public abstract class karl {abstract void fun();}package Karl.Doenitz;public abstract class doenitz extends karl{public static void main(String args[]){doenitz d = new doenitz(){void fun() {// TODO Auto-generated method stubSystem.out.println("asdf");}};d.fun();}}