package org.nhooo.example.util;
import java.util.Hashtable;
import java.util.Random;
public class HashtableGetRandom {
public static void main(String[] args) {
//创建一个哈希表并放置一些键值对。
Hashtable<String, String> colors = new Hashtable<>();
colors.put("black", "#000");
colors.put("red", "#f00");
colors.put("green", "#0f0");
colors.put("blue", "#00f");
colors.put("white", "#fff");
//从哈希表获取随机条目。
String[] keys = colors.keySet().toArray(new String[colors.size()]);
String key = keys[new Random().nextInt(keys.length)];
System.out.println(key + " = " + colors.get(key));
}
}
