<isNotEmpty property="exceptChannelList"> and codevalue notin <iterate property="exceptChannelList"open="("close=")"conjunction=","> <![CDATA[ #exceptChannelList[]# ]]> </iterate> </isNotEmpty> <isEmpty property="exceptChannelList"> <![CDATA[ and 1=1 ]]> </isEmpty> </isPropertyA...
3 public String test(@NotEmpty(message = "desc不能为空") String name, 4 @NotNull(message = "age不能为空") Long age, 5 @NotEmpty(message = "desc不能为空") String desc) { 6 return "test"; 7 } 1. 2. 3. 4. 5. 6. 7. 但是这样使用实体类,里面的属性使用@NotEmpty就是生效的:...
@Data@EqualsAndHashCode(callSuper = false)@Accessors(chain = true)public class ArticleRequest implements Serializable {private static final long serialVersionUID=1L;@NotBlank(message = "请填写文章标题")@Length(max = 200, message = "文章标题最多200个字符")private String title;@NotBlank(message =...
(); /** * 判断集合是否为空 */ public boolean isEmpty() { return size() == 0; } /** * 查找当前集合中是否存在等价于参数的元素(通过 equals 方法) * 通过迭代器遍历集合并比对元素实现 */ public boolean contains(Object o) { Iterator<E> it = iterator(); if (o==null) { while (it...
The API could not have been changed from Java 5 on because that would have broken all implementations of List which do not declare iterator() returning ListIterator also if most implementations return a ListIterator instance in real. A similar dilemma is Enumeration and Iterator. Nowadays Iterator...
JsonPath is shipped with three different JsonProviders: JsonSmartJsonProvider (default) JacksonJsonProvider JacksonJsonNodeJsonProvider GsonJsonProvider JsonOrgJsonProvider 更改配置默认值只能在应用程序初始化时完成。 强烈不建议在运行时进行更改,尤其是在多线程应用程序中。 Configuration.setDefaults(new Configuration...
1.List转JSONArray //定义泛型列表,T代表任意类型的对象List<T> list =newArrayList<T>();//检查list是否为空,避免在空列表上执行转换JSONArray array;if(list !=null&& !list.isEmpty()) {//使用fastjson库将List转换为JSONArrayarray =JSONArray.parseArray(JSON.toJSONString(list)); ...
.filter(s -> !s.isEmpty()) .collect(Collectors.toList()); 3、循环操作(forEach) 如果只是想对流中的每个对象进行一些自定义的操作,可以使用forEach: List<String> forEachLists = new ArrayList<>(); forEachLists.add("a"); forEachLists.add("b"); ...
isEmpty() method in List interfaceimportjava.util.*;publicclassGFG{publicstaticvoidmain(String[] args){// creating an Empty Integer ListList<Integer> arr =newArrayList<Integer>(10);// check if the list is empty or not// usingisEmpty() fucntionbooleanans = arr.isEmpty();if(ans ==true)...
, openWith["tif"]); } catch (KeyNotFoundException) { Console.WriteLine("Key = \"tif\" is not found."); } // When a program often has to try keys that turn out not to // be in the list, TryGetValue can be a more efficient // way to retrieve values. string value = "";...