(2) Fail-fast能快速定位错误位置,也方便Dubug。 如果user参数为null,你能定位到哪一行报错,但还不能确保是user还是user.getName的问题,所以你要去调试。如果变量的引用层级更深,定位问题源就更麻烦。如果在源头处控制了user的行为,那么后续操作就令人放心。如果我们在getUserName方法的第一行加上Objects.requireNon...
的java.util.Objects.requireNonNullElseGet(T, java.util.function.Supplier<? extends T>)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。 適用於 產品版本
Unlike the method #requireNonNull(Object, String), this method allows creation of the message to be deferred until after the null check is made. While this may confer a performance advantage in the non-null case, when deciding to call this method care should be taken that the costs of crea...
objects非空判断_requireNonNull方法 还记得我们学习过一个类 Objects吗,曾经提到过它由一些静态的实用方法组成,这些方法是 null-save (空指针安全的)或 null-tolerant(容忍空指针的),那么在它的源码中,对对象为ηu的值进行了抛出异常操作。 public static<T> T requirenonnu11Tobj):查看指定引用对象不是nul 声...
Retourne le premier argument s’il est non-null et sinon retourne la valeur non-null de supplier.get(). C# Copier [Android.Runtime.Register("requireNonNullElseGet", "(Ljava/lang/Object;Ljava/util/function/Supplier;)Ljava/lang/Object;", "", ApiSince=30)] [Java.Interop.JavaTypeParameters...
Object RequireNonNullElseGet (Java.Lang.Object? obj, Java.Util.Functions.ISupplier supplier); Paramètres obj Object un objet supplier ISupplier d’unnull autre objet à retourner si le premier argument est null Retours Object le premier argument s’il est non-null et sinon la valeur de...
if(obj ==null) { thrownewNullPointerException("obj must not be null"); } // work with obj } can be replaced with: 1 2 3 4 5 6 importjava.util.Objects; publicvoidfoo(SomeClass obj) { Objects.requireNonNull(obj,"obj must not be null"); ...
作者个人研发的在高并发场景下，提供的简单、稳定、可扩展的延迟消息队列框架，具有精准的定时任务和延迟...
static <T> TrequireNonNull(T obj,Supplier<String> messageSupplier) Checks that the specified object reference is notnulland throws a customizedNullPointerExceptionif it is. staticStringtoString(Objecto) Returns the result of callingtoStringfor a non-nullargument and"null"for anullargument. ...
These changes result in new versions of the altered type and all its dependent types and require the system to add, drop, or modify internal columns of dependent tables as part of the process of converting to the new version. When you make any of these kinds of changes to a type that ...