public static void main(String[] args) {
HashMap<String, Object> aMap = new HashMap<String, Object>();
aMap.put("title", "我想深拷贝。");
aMap.put("info", "你觉得我还在么?");
HashMap<String, Object> bMap = new HashMap<String, Object>();
// 通过putAll()实现深克隆
bMap.putAll(aMap);
aMap.remove("info");
System.out.println(aMap);
System.out.println(bMap);
}