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1. Top results related to types of web services in java

   • Types of References in Java

     In Java there are four types of references differentiated on the way by which they are garbage collected.

     • Strong References
     • Weak References
     • Soft References
     • Phantom References

     Prerequisite: Garbage Collection

     MyClass obj = new MyClass (); -

     obj = null;//'obj' object is no longer referencing to the instance. So the 'MyClass type object is now available for garbage collection. -

     // Java program to illustrate Strong reference class Gfg {     //Code.. } public class Example {     public static void main(String[] args)     {          //Strong Reference - by default         Gfg g = new Gfg();                       //Now, object to which 'g' was pointing earlier is          //eligible for garbage collection.         g = null;      } }  -

     If JVM detects an object with only weak references (i.e. no strong or soft references linked to any object object), this object will be marked for garbage...

     • This type of reference is used in WeakHashMap to reference the entry objects .
     • If JVM detects an object with only weak references (i.e. no strong or soft references linked to any object object), this object will be marked for garbage collection.

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   • Types of Interfaces in Java

     In Java, an interface is a reference type similar to a class that can contain only constants, the method signatures, default methods, and static methods, and its Nested types. In interfaces, method bodies exist only for default methods and static methods. Writing an interface is similar to writing to a standard class. Still, a class describes the attributes and internal behaviors objects, and an interface contains behaviors that a class implements. On the other side unless the class that implements the interface is purely abstract and all the interface methods need to be defined in that given usable class.

     An interface is Similar To a Class In Following Ways:

     • An interface can contain any number of methods in that interface.
     • An Interface can have constant values, which are implicitly defined as public static final.

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   • Types of Classes in Java

     A class is a blueprint in the Java programming language from which an individual object can be built. In Java, we may declare a class by using the class keyword. Class members and functions are declared simply within the class. Classes are required for the creation of Java programs. The object-oriented paradigm (OOP) allows users to describe real-world objects. Also, a class is sometimes known as a user-defined data type. The following components make up a class declaration:

     • Modifiers
     • Class name
     • Keywords
     • The class body within curly brackets {}.

     Class in Java  

     1. Class is a set of object which shares common characteristics/ behavior and common properties/ attributes. 2. Class is not a real world entity. It is just a template or blueprint or prototype from which objects are created. 3. Class does not occupy memory. 4. Class is a group of variables of different data types and group of methods.

     A class in java can contain: • data member • method • constructor • nested class and  • interface

     Syntax to declare a class:...

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   • Types of Thread Pools in java

     Top Answer

     Answered Jun 30, 2013 · 42 votes

     There are various thread pools in java:

     • Single Thread Executor : A thread pool with only one thread. So all the submitted tasks will be executed sequentially. Method : Executors.newSingleThreadExecutor()
     • Cached Thread Pool : A thread pool that creates as many threads it needs to execute the task in parrallel. The old available threads will be reused for the new tasks. If a thread is not used during 60 seconds, it will be terminated and removed from the pool. Method : Executors.newCachedThreadPool()
     • Fixed Thread Pool : A thread pool with a fixed number of threads. If a thread is not available for the task, the task is put in queue waiting for an other task to ends. Method : Executors.newFixedThreadPool()
     • Scheduled Thread Pool : A thread pool made to schedule future task. Method : Executors.newScheduledThreadPool()
     • Single Thread Scheduled Pool : A thread pool with only one thread to schedule future task. Method : Executors.newSingleThreadScheduledExecutor()

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   • Types of Nested Loops in Java

     Top Answer

     Answered May 08, 2010 · 6 votes

     You can nest as many for/while loops as you'd practically want in Java: there's no practical limit.

     Java has 4 looping constructs:

     • JLS 14.14 The for Statement JLS 14.14.1 The basic for Statement
     • JLS 14.14.2 The enhanced for Statement (aka " for-each")
     • JLS 14.12 The while Statement
     • JLS 14.13 The do Statement (aka " do-while")

     Java does not have goto (which isn't really needed anyway).

     See also

     • Java Nuts and Bolts/the for Statement
     • Java language guide/ for-each loop

     Examples

     This is a typical example of a simple "triangle"-type nested loop, where the number of iteration of the inner loop depends on the value being iterated in the outer loop:

     for (int i = 1; i <= 5; i++) { // prints: for (int j = 0; j < i; j++) { // * System.out.print("*"); // ** } // *** System.out.println(); // ****} // *****-

     Here's an example of a "pairing"-type nested loop, where the two loops are independent of each other, using the for-each construct:

     int[] numbers = { 1, 2, 3 }; // prints: // if swapped:char[] letters = { 'A', 'B', 'C' }; // 1 A // 1 A // 1 B // 2 Afor (int number : numbers) { // 1 C // 3 A for (char letter : letters) { // 2 A // 1 B System.out.println(number + " " + letter); // 2 B // 2 B } // 2 C // 3 B} // 3 A // 1 C // 3 B // 2 C // 3 C // 3 C-

     The for-each construct, which lacks explicit indices, makes the indepedence of both loops obvious: you can swap the two for statements in the above code, and you'd still get all pairs, though listed in a different order.

     This use of a boolean method for a while loop (this one from java.util.Scanner

     ) is typical:

     Scanner sc = new Scanner("here we go again"); // prints:while (sc.hasNext()) { // hereeeee String s = sc.next(); // weeeee char lastChar = s.charAt(s.length() - 1); // gooooo for (int i = 0; i < 4; i++) { // againnnnn s += lastChar; } System.out.println(s);}-

     And here's an example that shows how do-while is different from while-do and for:

     int x = 0; do { System.out.println("Hello!!!"); } while (x != 0);-

     The above loop prints Hello!!!: the body of a do-while is executed before the termination condition is checked.

     A more elaborate example

     Here's an example of a nested-loop logic, but refactored into methods to make things more readable. This is something that is important for beginners to learn: just because you can physically nest loops as many levels as you want, doesn't mean you should. By breaking apart the logic like this, the program becomes more modular and readable, and each logic stands on its own and can be tested and reused, etc.

     This snippet reverses the letters of a word in a char[] in-place.

     static void swap(char[] arr, int i, int j) { char t = arr[i]; arr[i] = arr[j]; arr[j] = t;}static void reverse(char[] arr, int from, int to) { int N = (to - from); for (int i = 0; i < N / 2; i++) { swap(arr, from+i, to-1-i); }}public static void main(String[] args) { char[] sentence = "reversing letters of words in sentence".toCharArray(); final int L = sentence.length; int last = 0; for (int i = 0; i <= L; i++) { if ((i == L) || (sentence[i] == ' ')) { reverse(sentence, last, i); last = i + 1; } } System.out.println(new String(sentence)); // prints "gnisrever srettel fo sdrow ni ecnetnes"}-

     This example is also instructive in that even though it's essentially a nested loop algorithm, it's actually O(N)! It's a mistake to think that any doubly nested-loop algorithm must be O(N^2) -- it really depends on the algorithm itself more than just the physical structure.

     Nested-loop Algorithms

     These are classical algorithms traditionally implemented using nested loops (at least in their naive forms):

     • O(N^2) Sorting algorithms: Bubble sortSelection sortInsertion sort
     • O(N^3) triply nested loop algorithms: Matrix multiplication
     • Table-filling dynamic programming algorithms Levenshtein distance ( O(N^2), string edit distance)
     • Floyd-Warshall Algorithm ( O(N^3), all-pairs shortest path in graph)

     These are far from an exhaustive sampling, but it should provide a good introduction to a variety of nested for loops algorithms for beginners.

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2. www.geeksforgeeks.org › microservicesWhat are Microservices? - GeeksforGeeks

   www.geeksforgeeks.org › microservices

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   4 days ago · Each microservice focuses on a distinct function or feature. API Gateway: The API Gateway is a central entry point for external clients to interact with the microservices. It manages requests, handles authentication, and routes requests to the appropriate microservices.

3. People also ask

   Why are web services important?

   • Protocol Agnostic: Web services can run on different transports although, the most typical transport is HTTP; other transports include SMTP and JMS. In conclusion, web services are an important technology that fosters compatibility and interaction between applications across disparate platforms.

   Web Services in Cloud Computing - GeeksforGeeks

   www.geeksforgeeks.org/web-services-in-cloud-computing/

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   How do I deploy a RESTful web service?

   • Create the necessary classes and methods in the RESTful web service module. Configure the artifacts to deploy. Create a run configuration. On the Deployment tab, specify the artifacts to deploy. Deploy the web service to an HTTP server and start the server. Run the application locally or on a remote host.

   RESTful web services | IntelliJ IDEA Documentation - JetBrains

   www.jetbrains.com/help/idea/restful-webservices.html

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   How do I register a web service?

   • 2. Service Discovery (UDDI) Registering the Service: To use web service, the service provider first needs to list his service in the UDDI (Universal Description, Discovery, and Integration). This is like a registry that shows where Web services can be published and found.

   Web Services in Cloud Computing - GeeksforGeeks

   www.geeksforgeeks.org/web-services-in-cloud-computing/

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4. www.jetbrains.com › help › ideaTutorial: Your first RESTful web service | IntelliJ IDEA

   www.jetbrains.com › help › idea

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   Jun 17, 2024 · This tutorial describes how to create a simple RESTful web service in IntelliJ IDEA and deploy it to the Tomcat GlassFish application server. The service will output Hello, World! when you access a specific URL through the web browser or otherwise send a GET request to this URL.

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6. www.geeksforgeeks.org › web-services-in-cloudWeb Services in Cloud Computing - GeeksforGeeks

   www.geeksforgeeks.org › web-services-in-cloud

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   Jun 5, 2024 · While the SOAP type of web service messages use the XML language and are based on complex protocols, the REST type of SaaS messages utilizes the HTTP standards and interchange data with the help of JSON.

7. www.baeldung.com › building-a-restful-web-serviceBuild a REST API with Spring and Java Config | Baeldung

   www.baeldung.com › building-a-restful-web-service

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   This article illustrated how to implement and configure a REST Service using Spring and Java-based configuration. In the next articles in the series, we’ll focus on Discoverability of the API, advanced content negotiation, and working with additional representations of a Resource.

8. www.baeldung.com › spring-webfluxGuide to Spring 5 WebFlux | Baeldung

   www.baeldung.com › spring-webflux

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   Jun 25, 2024 · Overview. Spring 5 includes Spring WebFlux, which provides reactive programming support for web applications. In this tutorial, we’ll create a small reactive REST application using the reactive web components RestController and WebClient. We’ll also look at how to secure our reactive endpoints using Spring Security. Further reading:

9. www.octalsoftware.com › blog › types-of-apiTypes of API Development in JAVA - Detailed Guide

   www.octalsoftware.com › blog › types-of-api

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   Jun 25, 2024 · Java APIs include everything from simple operations such as reading and writing files to fairly advanced operations such as networking, database operations, and graphical applications (GUI). These APIs are grouped into packages where each package provides a certain functionality.

10. www.jetbrains.com › help › ideaRESTful web services | IntelliJ IDEA Documentation - JetBrains

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    Jun 17, 2024 · Ultimate. RESTful web services . Last modified: 17 June 2024. IntelliJ IDEA provides support for developing, debugging, and testing of Java web services that comply to the representational state transfer (REST) architectural pattern. This includes various assistance features for the following: Jakarta RESTful Web Services API.