AI代码解释 @Test(expected=IllegalArgumentException.class)publicvoidwhenOrElseThrowWorks_thenCorrect(){String nullName=null;String name=Optional.ofNullable(nullName).orElseThrow(IllegalArgumentException::new);} 这个异
Methods declared in class java.lang.Object clone,finalize,getClass,notify,notifyAll,wait,wait,wait Method Detail empty public static <T>Optional<T> empty() Returns an emptyOptionalinstance. No value is present for thisOptional. API Note: ...
* @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...
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...
Added in 1.8. Java documentation forjava.util.OptionalInt. Portions of this page are modifications based on work created and shared by theAndroid Open Source Projectand used according to terms described in theCreative Commons 2.5 Attribution License. ...
1publicclassGetOptionalDemo {2publicstaticvoidmain(String[] args) {3 String name = null;4 Optional<String> optOrNull = Optional.ofNullable(name);5 System.out.println(optOrNull.get());6 }7} 这段程序在运行时会抛出异常：1Exception in thread "main" java.util.NoSuchElementException...
at java.util.Optional.orElseThrow(Optional.java:290) at OptionalTest.main(OptionalTest.java:42) 示例代码: 1packagecrazy;23importjava.util.Optional;45classCompany {6privateString name;7privateOptional<Office>office;89publicCompany(String name, Optional<Office>office) {10this.name =name;11this.offic...
if (name.isPresent()) { System.out.println(name.get());//输出javaHuang } emptyValue.isPresent()==false get 源码: /** * If a value is present in this {@code Optional}, returns the value, * otherwise throws {@code NoSuchElementException}. * * @return the non-null value held by ...
应输入“In” 模块中不恰当地使用了 <keyword> 关键字 维度“<dimensionnumber>”的索引“<indexnumber>”超出范围 从类型参数约束“<typeparameter1>”获得的间接约束“<constraint1>”与约束“<constraint2>”冲突 从类型参数约束“<typeparameter1>”获得的间接约束“<constraint1>”与从类型参数约束“<typeparamet...
packagelambda.stream;importjava.util.Optional;/***@author作者:cb *@version创建时间:2019年1月14日 上午11:12:12 **/publicclassOptionalDemo {publicstaticvoidmain(String[] args) { testIsPresent(); }publicstaticvoidtestIsPresent() { Optional<User> optional = Optional.ofNullable(newUser());boolean...