public class HashTableTest {
public static void main(String[] args) {
Hashtable<String, String> hashtable= new Hashtable<String, String>();
hashtable.put("name1", "张三");
hashtable.put("name2", "李四");
hashtable.put("name3", "王五");
Enumeration enumeration=hashtable.keys();
while(enumeration.hasMoreElements()){
Object key=enumeration.nextElement();
Object value=hashtable.get(key);
System.out.println(key+"========="+value);
}
}
}
name3=========王五 name2=========李四 name1=========张三
public class HashMapTest {
public static void main(String[] args) {
java.util.HashMap<String, String> map=new HashMap<String, String>();
map.put("name1", "张三");
map.put("name2", "李四");
map.put("name3", "王五");
Set<String> set=map.keySet();
Iterator<String> iterator=set.iterator();
while(iterator.hasNext()){
Object key =iterator.next();
System.out.println(key+"========="+map.get(key));
}
}
public class HashMapTest {
public static void main(String[] args) {
HashMap<String, String> map=new HashMap<String, String>();
map.put("name1", "张三");
map.put("name2", "李四");
map.put("name3", "王五");
for(Map.Entry<String, String> map1:map.entrySet()){
System.out.println(map1.getKey()+"===="+map1.getValue());
}
}
}
}
HashMap和HashTable的区别:
(1)HashTable是基于Dictionary,而HashMap是基于Map接口
(2)HashTable是线程安全,而HashMap不是
(3)HashMap允许控制的key和value,而HashTable不允许