class B extends Af int x=20; int n; int getNxO{ return 20*x; int getNx(int n)( return n*x; void printO{ System.out.println("B "+this.x+""+this.getNx(); System.out.println("B:"+this.x+""+this.getNx(30)); System.out.printIn("父类："+super..x+""+super..getNxO): public class C( public static void main(String args[)( B B1=new B(); B1.printO: 》 } } class B extends A{ int x=20; int n; int getNx(){ return 20*x; } int getNx(int n){ return n*x; } void print(){ System.out.println("类 B："+this.x+" "+this.getNx()); System.out.println("类 B："+this.x+" "+this.getNx(30)); System.out.println("父类:"+super.x+" "+super.getNx()); } } public class C{ public static void main(String args[]){ B B1=new B(); B1.print(); }}