遍历Map方法二（用到Map.Entry内部类）

package michael.wlq;import java.util.HashMap;import java.util.Iterator;import java.util.Map.Entry;import java.util.Set;public class MapTest1 {public static void main(String[] args) {HashMap<String, String> map = new HashMap<String, String>();map.put("a", "aa");map.put("b", "bb");map.put("c", "cc");map.put("d", "dd");Set<Entry<String, String>> set = map.entrySet();for (Iterator<Entry<String, String>> iter = set.iterator(); iter.hasNext();) {Entry<String, String> entry = iter.next();String key = (String) entry.getKey();String value = (String) entry.getValue();System.out.println(key + " : " + value);}}}

输出结果为：