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2¡¢ÔËÐÐʱÀàÐͼì²é£¬²»Í¬ÀàÐ͵ķºÐÍÀàÊǵȼ۵ģ¨Pair<String>ÓëPair<Employee>ÊÇÊôÓÚͬһ¸öÀàÐÍPair£©£¬
     ÕâÒ»µãÒªÌØ±ð×¢Ò⣬¼´Èç¹ûa instanceof Pair<String>==trueµÄ»°£¬²¢²»´ú±ía.getFirst()µÄ·µ»ØÖµÊÇÒ»¸öStringÀàÐÍ
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5¡¢²»¿ÉÒÔÓ÷ºÐ͹¹Ôì¶ÔÏ󣬼´first = new T(); ÊÇ´íÎóµÄ
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     Pair<Manager> managerBuddies = new Pair<Manager>(ceo, cfo);
     Pair rawBuddies = managerBuddies;  ÕâÀï±àÒëÆ÷²»»á±¨´í£¬µ«´æÔÚ×ÅÑÏÖØµÄÔËÐÐʱ´íÎóÒþ»¼


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import java.io.*;
import java.net.*;
public class EchoServer {
private int port=8888;
private ServerSocket serverSocket;
public EchoServer() throws IOException {
serverSocket = new ServerSocket(port);
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package demo;
interface Runner{
 int ID=1;
 void run();
 void fly();
}
abstract class AI implements Runner{
 public void run(){
  System.out.println("I am running");
 }
 public void bb(int x,int y){
  System.out.println((x+y));
 }
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