public class ReNumber public static void main(String[]args){ Number nl=new NumberO; Number n2=new Number(); n1.i=47: n2.i=13: System.out.println("n1.i="+n1.i+"n2.i="+n2.i); n1=n2; System.out.println("n1.i="+nl.i+"n2.i="+n2.i); 》 2)程序的输出结果是 interface OneToN{ int disp(int n); class Sum implements OneToN( public int disp(int n){ int s=1; for(int i=1;i<=n;i++) s*=i; return s public class UseInterface(public class ReNumber{ public static void main(String[] args){ Number n1=new Number(); Number n2=new Number(); n1.i=47; n2.i=13; System.out.println(“n1.i=”+n1.i+”n2.i=”+n2.i); n1=n2; System.out.println(“n1.i=”+n1.i+”n2.i=”+n2.i); }} 2) 程序的输出结果是 interface OneToN{ int disp(int n); } class Sum implements OneToN{ public int disp(int n){ int s=1; for(int i=1;i<=n;i++) s*=i; return s; }} public class UseInterface{