Example 1: Check if String is Empty or Null class Main { public static void main(String[] args) { // create null, empty, and regular strings String str1 = null; String str2 = ""; String str3 = " "; // check if
AI代码解释 rule"Testing Comments"when// this is a single line commenteval(true)// this is a comment in the same line of a patternthen// this is a comment inside a semantic code blockend 复制代码 When表示条件,then是满足条件以后,可以执行的动作,在这里可以调用任何java方法等。在drools不支持字...
When working with strings in Java, it is essential to check if a string is null or empty. A null string refers to the absence of any value, while an empty string is a string with zero characters. Failing to handle null or empty strings appropriately can lead to unexpected errors and ...
public void given3Streams_whenPrepending_thenResultStreamContainsAllElements() { Stream<String> seq = Stream.of("foo", "bar"); Stream<String> openingBracketSeq = Stream.of("["); Stream<String> closingBracketSeq = Stream.of("]"); Stream<String> resultingStream = Seq.ofType(seq, String.cla...
== 0);3、Java SE 6.0 才刚刚开始提供，效率和方法二差不多：if(a == null || a.isEmpty(...
String result = StringProcessor.processString(input); assertThat(result).isEqualTo("Processed: Hello"); } } 在这些测试中: whenInputIsNull_thenReturnsDefaultMessage :此测试检查输入为null时方法的行为。它断言该方法返回预期的默认消息。 whenInputIsNotNull_thenProcessesInput:此测试验证该方法是否正确处理非...
(BookServicebookService){this.bookService=bookService;}@GetMappingpublicFlux<Book>getAllBooks(){returnbookService.getAllBooks();}@GetMapping("/{id}")publicMono<Book>getBookById(@PathVariableStringid){returnbookService.getBookById(id).switchIfEmpty(Mono.error(newBookNotFoundException("Book not found...
public String getCarInsuranceName(Person person) { if (person == null) { return "Unknown"; } Car car = person.getCar(); if (car == null) { return "Unknown"; } Insurance insurance = car.getInsurance(); if (insurance == null) { ...
== null | | count ==0L)这种方式可能导致拆箱时报异常，应先检验对象存储是否为空再转换为原始类型。封装到工具类能提高复用性，举例典型写法：public class NullUtil public static boolean check(Object obj)return obj == null | | (obj instanceof String && ((String) obj).trim().isEmpty());
publicstaticvoidmain(String[] args){// D盘下的bbb.java文件File f =newFile("D:\\bbb.java");System.out.println(f.getAbsolutePath());// 项目下的bbb.java文件File f2 =newFile("bbb.java");System.out.println(f2.getAbsolutePath());}}输出结果:D:\bbb.javaD:\idea_project_test4\bbb.java...