1、         private static Hashtable<Integer, Object> table = new Hashtable<Integer, Object>(); private static int length = 0; // 长度 /** * hashtable实现put */ public static void push(Object b) { table.put(length++, b); } /** * Hashtable实现pop * @return */ public static Object pop() { if(table.size() == 0) { return null; } length--; Object obj = table.remove(length); return obj; }