y.java

来自「北京大学出版社的」· Java 代码 · 共 24 行

class X {
   public X() {
      System.out.println( "Constructing X" );
      f();
   }
   protected void f() {
      System.out.println( "X.f()" );
   }
   protected void g() {
      System.out.println( "X.g()" );
   }
}
public class Y extends X {
   public Y() {
      System.out.println( "Constructing Y" );
      f();
   }
   protected void f() {
      System.out.println( "Y.f()" );
   }
   public static void main( String[] args ) {
      new Y();
   }
}