Java tutorial
//package com.java2s; import java.util.HashSet; import java.util.Set; public class Main { public static final String POOL1_NAME = "myFirstPool"; public static final String POOL2_NAME = "mySecondPool"; public static Set<String> getAvailableIds() { Set<String> ids = new HashSet<>(); ids.add(POOL1_NAME); ids.add(POOL2_NAME); return ids; } }