orElseGet是可以传入一个supplier接口的lambda表达式,来实现不同的逻辑 Object value = Optional.ofNullable(null).orElseGet(() -> { // 例如之前的值是从Redis缓存中查询的值,没有查询到 // 则查询数据库 // 将值保存到redis // 返回值 return "从数据库查询到的值"; }); orElseThrow 理解了上面的,...
@RequestMapping(value = "/eq", method = RequestMethod.GET) public String findUserWithId2(HtpServletRequest request, HtpServletResponse response){ List<Map<String, Object>> tmpList = jdbcTemplate.queryForList("select * from user where id=" + request.getParameter("id")); return JSON.toJSON(tm...
using the {@link Ext.form.Field#getValue getValue()} method. * If multiple fields exist with the same name they are returned as an array. * @param {Boolean} dirtyOnly (optional) True to return only fields that are dirty. * @return {Object} The values in the form */ ...
NullPointerException is a RuntimeException. In Java, a specialnullvalue can be assigned to an object reference. NullPointerException is thrown when an application attempts to use an object reference that has thenullvalue. These include: Calling the instance method of a null object. Accessing or ...
Object An error response from the Compute service. Expand table NameTypeDescription error ApiError Api error. ComponentNames Enumeration The component name. Currently, the only allowable value is Microsoft-Windows-Shell-Setup. Expand table ValueDescription Microsoft-Windows-Shell-Setup DataDisk Object...
Object 這個所描述的非null值Optional 屬性 RegisterAttribute 備註 如果值存在,則傳回 值,否則會NoSuchElementException擲回 。 的java.util.Optional.get()Java 檔。 此頁面的部分是根據 Android 開放原始碼專案所建立和共用的工作進行修改,並根據 Creative Commons 2.5 屬性授權中所述的詞彙使用。
Optional empty = Optional.ofNullable(null); //创建一个不允许值为空的空实例 Optional noEmpty = Optional.of(null); //当值不为null,orElse方法返回Optional实例的值 //当为null,返回传入的消息 //输出java265.com System.out.println(name.orElse("other value!")); ...
Options field_options array of object Options Value field_options.value string Type field_type string Type Value field_value string Value is_collectable is_collectable boolean Collecting field is_editable is_editable boolean Editable field is_required is_required boolean Required field Page ...
public GetTagOptionalParameter withThisclientacceptLanguage(String thisclientacceptLanguage) Set the thisclientacceptLanguage value. Parameters: thisclientacceptLanguage - the thisclientacceptLanguage value to set Returns: the GetTagOptionalParameter object itself. Applies to Azure SDK for J...
IdpsQueryObject IkeEncryption IkeIntegrity InboundNatPool InboundNatRule InboundNatRuleListResult InboundNatRulePortMapping InboundNatRules InboundNatRulesCreateOrUpdateOptionalParams InboundNatRulesCreateOrUpdateResponse InboundNatRulesDeleteOptionalParams InboundNatRulesGetOptionalParams InboundNatRulesGetRespon...