Map的泛型运用

import java.util.*;public class MapGeneric{public static void main(String args[]){Map<String,String> map=new HashMap<String,String>();map.put("a", "aa");map.put("b", "bb");map.put("c", "cc");map.put("d", "dd");Set<String> set=map.keySet();Iterator<String> ite=set.iterator();while(ite.hasNext()){String str=ite.next();System.out.println(str+" = "+map.get(str));}System.out.println("-----------------------------------");Set<Map.Entry<String, String>> set1=map.entrySet();Iterator<Map.Entry<String,String>> i=set1.iterator();while(i.hasNext()){Map.Entry<String, String> s=i.next();System.out.println(s.getKey()+" = "+s.getValue());}}}