it개발자스터디공간

import java.util.*;

public class MapIterTest1 {

  public static void main(String[] args) {

  HashMap list=new HashMap();

  list.put("0","lee");//0

  list.clear();//모두 제거

  list.put("1","cho");//1

  list.put("2","kim");//2

  list.put("3","chung");//3

  list.put("4","min");//4

  list.put("3","jung");//3과 동일 에러

  System.out.println(list.size());//size()

  System.out.println(list.containsKey("3"));

  list.remove("2");//2제거 key를 이용

  System.out.println(list.size());

 print(list);//Set 만들기

   }

   public static void print(Map sets){

  Set set=sets.keySet();//key값을 Set으로

  Iterator iter=set.iterator();

  while(iter.hasNext()){

  String key=(String)iter.next();

  System.out.println(key+"  "+sets.get(key));//value

  }

   }//

}