一>java遍历Hashtabe:
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import java.util.Hashtable;import java.util.Set;public class HashTableTest { public
static void main(String args[]){ Hashtable<String, String> ht = new
Hashtable<String, String>(); ht.put("one", "The first"); ht.put("two", "The second"); ht.put("three", "The third"); Set<String> s = ht.keySet(); for(String ss:s){ System.out.println("Current hashtable element is: "
+ ss); } }} |
对象的遍历:
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Person person1=new
Person("zhangsan",20);Person person2=new
Person("lisi",21);Person person3=new
Person("wangwu",22);Hashtable ht = new
Hashtable();//不能Map ht=new Hashtable();若加强制转换后，后面方法不能用ht.put("first", person1);ht.put("second", person2);ht.put("three", person3);Enumeration e=ht.elements();while(e.hasMoreElements()){ Person person=(Person)e.nextElement(); System.out.println(person.getName()+" "+person.getAge()); } |
二>java遍历Hashmap:
第一种方法.据说效率高
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import java.util.Map;import java.util.HashMap;import java.util.Iterator;public class HashMapTest { public
static void main(String args[]){ Map map = new
HashMap(); map.put("Fruit1", "Apple"); map.put("Fruit2", "Orange"); map.put("Fruit3", "Pear"); Iterator it = map.entrySet().iterator(); while(it.hasNext()){ Map.Entry entry = (Map.Entry)it.next(); Object key = entry.getKey(); Object value = entry.getValue(); System.out.println("Map key: "
+ key + " "
+ "Map value: "
+ value); } }} |
第二种方法:
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Map map = new
HashMap();Iterator iter = map.keySet().iterator();while (iter.hasNext()) { Object key = iter.next(); Object val = map.get(key);} |
java遍历Hashmap/Hashtable的几种方法,布布扣,bubuko.com
原文：http://www.cnblogs.com/harry0906/p/3662723.html