摘要：
1 interface A 2 {public void get(); 3 } 4 class B implements A 5 {public void get(){ 6 System.out.println("出席活动"); 7 } 8 } 9 class C implements A 10 {private A a; 11 public C(A a){ 12 ... 阅读全文
摘要：
1 interface A 2 {public void fintr(); 3 } 4 class B implements A 5 {public void fintr(){ 6 System.out.println("666"); 7 } 8 } 9 class C implements A 10 {public void fintr(){ 11 Sys... 阅读全文