Java tutorial
//package com.java2s; import java.util.Random; public class Main { private static final String[] BEECLOUD_HOSTS = { "https://apibj.beecloud.cn", "https://apisz.beecloud.cn", "https://apiqd.beecloud.cn", "https://apihz.beecloud.cn" }; private static final String HOST_API_VERSION = "/2/"; private static final String REFUNDS_QUERY_URL = "rest/refunds?para="; public static String getRefundsQueryURL() { return getRandomHost() + REFUNDS_QUERY_URL; } private static String getRandomHost() { Random r = new Random(); return BEECLOUD_HOSTS[r.nextInt(BEECLOUD_HOSTS.length)] + HOST_API_VERSION; } }