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Java Articles
Page 344 of 450
Convert bytes to a string in java
Use String(byte[]) constructor to convert byte[] to String.Examplepublic class Tester { public static void main(String[] args) { String test = "I love learning Java"; byte[] bytes = test.getBytes(); String converted = new String(bytes); System.out.println(converted); } }OutputI love learning Java
Read MoreThe most elegant ways to iterate the words of a java string.
Just split the string based on space and then iterate it. See the example below −Examplepublic class Tester { public static void main(String[] args) { String test = "I love learning Java"; String[] subStrings = test.split(" "); for(String subString: subStrings) { System.out.println(subString); } } }OutputI love learning Java
Read MoreWhy use Java annotations?
Annotations provide information about java elements. Annotations can be interpreted by compiler or IDE at compile time or by JVM at runtime. Annotations can be usedto show attributes of an element: e.g. @Deprecated, @Override, or @NotNullto describe the purpose of an element of the framework, e.g. @Entity, @TestCase, @WebServiceto describe the behavior of an element: @Statefull, @TransactionBefore Java 5, XML was primarily used to store information about java objects, with annotations, this information can be stored within the java code itself.
Read MoreHow to create a JAR file?
You can create a JAR file using the following command.jar cf jar-file input-file(s) You can also create JAR files using IDE’s. To create a JAR file using eclipse follow the procedure given below.Open the Jar File wizardThe Jar File wizard can be used to export the content of a project into a jar file. To bring up the Jar File wizard −In the Package Explorer select the items that you want to export. If you want to export all the classes and resources in the project just select the project.Click on the File menu and select Export.In the filter text box ...
Read MoreSAP interfaces throws an error message "Completion Code 2, Reason 2161, MQJMS2002
As per my understanding, the only way to get the MQ jar files or the MQ C/C++ library files onto a system is by installing any of the below:Using WebSphere MQ product orUsing WebSphere MQ Client SupportPacsYou can find jar file under WebSphere MQ V7.0 Clients SupportPacks. The install files are commonly available under java/lib directory.You can try installing jar files from Fix Central. Go to Fix Central and enter "Java" in the Text search box.https://www-945.ibm.com/support/fixcentral/swg/identifyFixes?query.parent=ibm~WebSphere&query.product=ibm~WebSphere~WebSphere%20MQ&query.release=9.0&query.platform=AllThe name of the file to be downloaded is in this format:-[IBM|WS]-MQ-Install-Java-All.jar.For example, for MQ V9.0:9.0.0.0-IBM-MQ-Install-Java-All.jar.You have the following files that can be moved to ...
Read MoreJava Memory Model
Java memory model is divided between Thread Stacks (One for each thread) and a heap area.Thread Stack: It is a thread specific memory area and contains local variables, methods call information etc. JVM stacks could be of fixed size or variable size. If computation in a thread exceeds its stack size limit then JVM throws StackOverflowError and exits.HeapIt contains all the objects created during application lifecycle. The heap is created when the virtual machine starts up. Garbage collector reclaims heap storage for objects and objects are never explicitly deallocated. The JVM is not using any automatic storage management system, and ...
Read MoreJava Memory Model
Java memory model is divided between Thread Stacks (One for each thread) and a heap area.Thread Stack: It is a thread specific memory area and contains local variables, methods call information etc. JVM stacks could be of fixed size or variable size. If computation in a thread exceeds its stack size limit then JVM throws StackOverflowError and exits.HeapIt contains all the objects created during application lifecycle. The heap is created when the virtual machine starts up. Garbage collector reclaims heap storage for objects and objects are never explicitly deallocated. The JVM is not using any automatic storage management system, and ...
Read MoreHow many non-access modifiers are there in Java?
Java provides some other modifiers to provide the functionalities other than the visibility. These modifiers are called Non-Access ModifiersStatic The members which are declared as static are common to all instances of a class. Static members are class level members which are stored in the class memory.Final This modifier is used to restrict the further modification of a variable or a method or a class. The value of a variable which is declared as final can’t be modified once it gets a value. A final method can not be overridden in the subclass and you can not create a subclass ...
Read MoreStackWalker API in Java 9?
StackWalker API allows easy filtering and lazy access to execute tasks within any method. It is an efficient API for obtaining stack trace information in Java 9.There are three new important classes in StackWalker API: StackWalker, StackWalker.StackFrame and StackWalker.Option.StackWalker − It is the main class in StackWalker API. We traverse stack frames by using StackWalker.forEach() method and get caller class in an efficient way by calling StackWalker.getCallerClass() method. We walk through stack traces and applying a function on a stream of stack frames by using StackWalker.walk() method.StackWalker.StackFrame − It is a static nested class of StackWalker and represents method invocation ...
Read Morejava access modifiers with method overriding
Yes, an overridden method can have a different access modifier but it cannot lower the access scope.The following rules for inherited methods are enforced -Methods declared public in a superclass also must be public in all subclasses.Methods declared protected in a superclass must either be protected or public in subclasses; they cannot be private.Methods declared private are not inherited at all, so there is no rule for them.
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