实例 importjava.util.Optional;importjava.util.function.Supplier;publicclassTester{publicstaticvoidmain(String[]args){Optional<String>optional1=Optional.of("Mahesh");Supplier<Optional<String>>supplierString=()->Optional.of("Not Present");optional1=optional1.or(supplierString);optional1.ifPresent(x->S...
System.out.println(inWhichCountryUppercase(lucy)); // 输出:Exception in thread "main" java.util.NoSuchElementException // at java.util.Optional.orElseThrow(Optional.java:290) // at com.huawei.vmf.adapter.inventory.OptionalDemo.inWhichCountryUppercase(OptionalDemo.java:47) // at com.huawei.vm...
publicclassTest{publicstaticvoidmain(String[]args){newPerson().create("源码之路",name->System.out.println("调用回调函数:"+name));}} 小括号()去掉了,这归功于Java8的类型推导机制。因为现在接口里只有一个方法,那么现在这个Lambda表达式肯定是对应实现了这个方法,既然是唯一的对应关系,那么入参肯定是String...
* @see java.util.Optional#filter(java.util.function.Predicate) */@TestpublicvoidtestFilter(){// create oneOptional<User>userOne=Optional.<User>ofNullable(newUser());// 用LAMDA表达式实现Predicate接口userOne=userOne.filter(e->{returne.getName()==null||"".equals(e.getName());});// test...
The findOne method returns the only row in the result set, if any. It returns Optional.empty() if zero rows are returned, or if the row itself is null. For the example, we need the jdbi3-core and the postgresql artifacts. Main.java ...
java.lang.Object com.microsoft.azure.cognitiveservices.language.luis.authoring.models.ImportMethodAppsOptionalParameter public class ImportMethodAppsOptionalParameter The ImportMethodAppsOptionalParameter model. Method Summary 展開資料表 Modifier and TypeMethod and Description ...
Overrides: hashCodein classObject Returns: hash code value of the present value or 0 if no value is present See Also: Object.equals(java.lang.Object),System.identityHashCode(java.lang.Object)
java.lang.Object com.microsoft.azure.cognitiveservices.language.luis.authoring.models.ListExamplesOptionalParameterpublic class ListExamplesOptionalParameterThe ListExamplesOptionalParameter model. Method Summary Espandi tabella Modifier and TypeMethod and Description Boolean enableNestedChildren...
java.lang.Object com.microsoft.azure.cognitiveservices.language.luis.authoring.models.ListIntentsOptionalParameterpublic class ListIntentsOptionalParameterThe ListIntentsOptionalParameter model. Method Summary 展開表格 Modifier and TypeMethod and Description Integer skip() Get the skip...
java.lang.Object com.microsoft.azure.cognitiveservices.vision.contentmoderator.models.MatchMethodOptionalParameterpublic class MatchMethodOptionalParameterThe MatchMethodOptionalParameter model. Method Summary Rozwiń tabelę Modifier and TypeMethod and Description Boolean cacheImage() Get th...