1Java:has a ; is a意义1. Which statement is true about has-a and is-a relationships?AA.Inheritance represents an is-a relationship.B.Inheritance represents a has-a relationship.C.Interfaces must be use when creating a has-a relationship.D.Instance variables must be used when creating an ...
A选项:HashSet内部采用哈希表存储数据,元素的存储顺序不固定,因此不保证有序。错误。B选项:HashSet可以通过add、remove等方法修改内容,故不是不可变的。错误。C选项:HashSet实现了Set接口,其核心特性是元素唯一,不允许重复。正确。D选项:元素无需通过键访问,HashSet没有键值对结构,此描述属于Map特性。错误。E选项:...
C.集合中的元素被保证为唯一的 错 有序的 所以不唯一 D.集合中的元素使用一个唯一的键来存取 错 没有键 E.集合中的元素被保证为同步的 错 不是同步的
Which PHP function is used to split a string into an array by a delimiter? What is the default session timeout in PHP? Which statement is true about PHP namespaces? In PHP, which function can you use to convert a string to an integer? Do...
Which statement is true about PHP namespaces? In PHP, which function can you use to convert a string to an integer? What does the 'continue' statement do in a PHP loop? Which PHP function is used to send a custom HTTP header? What does the 'PDO' stand for in PHP? How can...
例如,在Java Swing中,可以为同一个按钮添加多个ActionListener,每个监听器都会独立响应事件。 **选项B分析**:错误。当多个监听器被添加到同一组件时,事件会触发所有已注册的监听器,而非仅影响其中一个。触发顺序通常与添加顺序一致。 **选项C分析**:错误。绝大多数现代GUI框架允许组件绑定多个监听器,此选项与实际...
Which of the following statements is (are) true about the use of an asterisk (*) in a Java import statement? It does not incur run-time overhead. It can be used to import multiple packages with a single statement. It can be used to import multiple classes with a single statement. (...
1. 解释Java 7中try-with-resources语句的引入原因 在Java 7之前,处理如文件、数据库连接等需要手动关闭的资源时,开发人员必须在try-catch语句后显式地添加一个finally块来关闭这些资源。这种做法不仅增加了代码的复杂性,还容易因为疏忽忘记关闭资源而导致资源泄露。为了简化资源管理,Java 7引入了try-with-resources语...
2)What is the printout for the second statement in the main method? public class Foo { static int i = 0; static int j = 0; public static void main(String[ ] args) { int i = 2; int k = 3; { int j = 3; System.out.println("i + j is " + i + j); } k = i + j...
unless the 2-in-1's additional tablet features are truly desired. comparing 2-in-1 laptops to tablets is a more pertinent analysis. the tablet in a 2-in-1 is fully functional, creating a true option for consumers who think they might want additional laptop functionality along with their ...