Map读取键值对，Java遍历Map的两种实现方法

第一种方法是根据map的keyset（）方法来获取key的set集合，然后遍历map取得value的值

import java.util.HashMap;
import java.util.Iterator;
import java.util.Set;

public class HashMapTest2
{
public static void main(String[] args)
{
  HashMap map = new HashMap();

  map.put("a","aaaa");
  map.put("b","bbbb");
  map.put("c","cccc");
  map.put("d","dddd");

  Set set = map.keySet();

  for(Iterator iter = set.iterator(); iter.hasNext();)
  {
   String key = (String)iter.next();
   String value = (String)map.get(key);
   System.out.println(key+"===="+value);
  }
}
}

第二种方式是使用Map.Entry来获取：

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

public class HashMapTest4
{
public static void main(String[] args)
{
  HashMap map = new HashMap();

  map.put("a","aa");
  map.put("b","bb");
  map.put("c","cc");
  map.put("d","dd");

  Set set = map.entrySet();

  for(Iterator iter = set.iterator(); iter.hasNext();)
  {
   Map.Entry entry = (Map.Entry)iter.next();

   String key = (String)entry.getKey();
   String value = (String)entry.getValue();
   System.out.println(key +" :" + value);
  }
}
}

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