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interface Action {
 void sing();
 void dance(); 
}
public class Person {
 
 @Override
 public void sing() {
  System.out.println("singing...");
 }
 
 @Override
 public void dance() {
  System.out.println("dancing...");
 }
}
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public class Demo {
 public static void main(String args[]) {
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  final Action person = new Person();//ÕâÀïÊÇÓÃfinalÊÇÒòΪÏÂÃæµÄÄÚ²¿ÀàÖÐÓõ½Á˴˶ÔÏó
  /*²é¿´APIÖеÄProxy´úÀíÀ࣬·¢ÏÖÓиö·½·¨newPrxoyInstance¿ÉÒÔ»ñµÃ´úÀí¶ÔÏó*/
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