Java tutorial
//package com.java2s; import java.io.Serializable; import java.util.HashMap; import java.util.Map; public class Main { /** * Returns serializable map containing one-column order list, that can be serialized/deserialized by GWT serializer * NOTE: result of {@link Collections#singletonMap(Object, Object)} is not in white list for GWT serializer and * can't be serialized/deserialized * * @param column * column name * @param ascending * true if order is ascending * @return one-column order list */ public static <K extends Serializable, V extends Serializable> Map<K, V> getOrderList(K column, V ascending) { HashMap<K, V> map = new HashMap<K, V>(); map.put(column, ascending); return map; } }