Hashtable类

1、API介绍

2、构造方法

3、特有功能方法

import java.util.Enumeration;
import java.util.Hashtable;

public class Demo4_Hashtable {

    public static void main(String[] args) {
        Hashtable<String, String> map = new Hashtable<>();
        map.put("cn", "china");
        map.put("en", "english");
        map.put("us", "america");
        map.put("jp", "japan");

        //.elements() 获取包含所有值的枚举器
        for (Enumeration<String> elements = map.elements(); elements.hasMoreElements(); ) {
            String value = elements.nextElement();
            System.out.println(value);
        }

        //.keys() 获取包含所有键的枚举器
        for (Enumeration<String> keys = map.keys(); keys.hasMoreElements(); ) {
            String key = keys.nextElement();
            String value = map.get(key);
            System.out.println(key + "..." + value);
        }
    }
}