Category Archives: 程式語言

Ref: java.util.Arrays.asList用法及注意事项 java集合中部分异常java.lang.UnsupportedOperationException一个共同点 Because the ArrayList made by Arrays.asList function could not be modified anymore…

Ref: 剑飘江湖的博客 – JSON格式数据中特殊字符的处理 public static String stringToJson(String s) { if (StringUtils.isEmpty(s)) { return s; } StringBuffer sb = new StringBuffer (); for (int i=0; i<s.length(); i++) { char c = s.charAt(i); switch (c) { case ‘”‘: sb.append(“\””); break; /*case … Continue reading →

Ref: stackoverflow: Initialization of an ArrayList in one line List<String> places = Arrays.asList(“Buenos Aires”, “Córdoba”, “La Plata”);

Ref: Java Hashmap: How to get key from value? private Object getKeyFromValue(Map map, Object value) { for (Object object : map.keySet()) { if (map.get(object).equals(value)) { return object; } } return null; }

Ref: stackoverflow：How to check whether a given string is valid JSON in Java public boolean isJSONValid(String test) { try { new JSONObject(test); } catch (JSONException ex) { // edited, to include @Arthur’s comment // e.g. in case JSONArray is valid … Continue reading →