ServletConfig与ServletContext对象详解

public class Test {

/**
* @param args
*/
public static void main(String[] args) {
A a=new C();
a.f();
}

}
abstract class A {

protected void  m1(){
System.out.println("A m1()");
m2();
}
protected abstract void  m2();
public abstract void f();
}
class B extends A {

@Override
protected void m2() {
System.out.println("B m2");
}
public void f(){
System.out.println("B f");
this.m1();
}

}
class C extends A {

@Override
protected void m2() {
System.out.println("C m2()");
}

public void f(){
System.out.println("C f()");
this.m1();
}

}