String is a part of “java.lang” package and this package gets loaded by default by the Java Virtual Machine so we need not to import it. If we import it explicitly, there is no harm in doing that. What is the
This means that if a key is no longer referenced elsewhere, it can be garbage collected. This behavior makes it useful in scenarios where memory cleanup is desired based on key references.Q13. Explain the concept of Java Generics and its purpose....
then we need to take care of changing some package names, class names, method or function names etc. For instance, If you are using old Scala version and your project is using BeanProperty annotation. It was available in “scala.reflect...
Checked exceptions are error scenarios that require to be handled in the code, or else you will get compile time error. For example, if you use FileReader to read a file, it throwsFileNotFoundExceptionand we must catch it in the try-catch block or throw it again to the caller method. ...
What is the difference between fail-fast and fail-safe iterators in Java?Fail-fast iterators immediately throw a ConcurrentModificationException if the collection is modified structurally while iterating. Examples: ArrayList, HashMap iterator. Fail-safe iterators work on a cloned copy of the collection...
There are different memory areas allocated by JVM such as Heap, Stack, Method Area,PC Registers, and Native Method Stack. If I run outof parade with zero args on the command line, the value stored in the String array passed into the main() method is blank or NULL?
😮 Core Interview Questions & Answers For Experienced Java(Backend) Developers | 互联网 Java 工程师进阶知识完全扫盲:涵盖高并发、分布式、高可用、微服务、海量数据处理等领域知识 - doocs/advanced-java
200. What will be the default values of all the elements of an array defined as an instance variable? If the array is an array of primitive types, then all the elements of the array will be initialized to the default value corresponding to that primitive type. ...
Voici un exemple de procédure wrapper PL/SQL MY_PROC pour une procédure stockée PROC qui prend une commande BOOLEAN en entrée : PROCEDURE MY_PROC (n NUMBER) IS BEGIN IF n=0 THEN proc(false); ELSE proc(true); END IF; END; PROCEDURE PROC (b BOOLEAN) IS BEGIN ... END; Le basc...
On the other hand, if browser independence is important, then Java Web Start is the deployment platform of choice. There are a number of other differences, but this is the fundamental difference.Java Plug-in technology enables users to run Java applets inside a browser....