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1. Top results related to what is a container in java

   • What is a callback in java

     Top Answer

     Answered Jan 05, 2012 · 58 votes

     Maybe an example would help.

     Your app wants to download a file from some remote computer and then write to to a local disk. The remote computer is the other side of a dial-up modem and a satellite link. The latency and transfer time will be huge and you have other things to do. So, you have a function/method that will write a buffer to disk. You pass a pointer to this method to your network API, together with the remote URI and other stuff. This network call returns 'immediately' and you can do your other stuff. 30 seconds later, the first buffer from the remote computer arrives at the network layer. The network layer then calls the function that you passed during the setup and so the buffer gets written to disk - the network layer has 'called back'. Note that, in this example, the callback would happen on a network layer thread than the originating thread, but that does not matter - the buffer still gets written to the disk.

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   • What is a consumer in Java?

     Top Answer

     Answered May 12, 2021 · 6 votes

     Despite various info you can find about "Producer/Consumer" pattern, in Java there is a specific functional interface called Consumer, which belongs to the package java.util.function. That is just one of the various functional interfaces (there are 4 main ones: Consumer, Function, Predicate and Supplier, along with additional subinterfaces) which Java makes available to be used in particular for defining lambda expressions, to be used in combination with Java Stream. If you look at the specification, Consumer, this functional interface is defined over a specific target type T and exposes a method called accept, whose signature is the following:

     void accept(T t);-

     So, the Consumer functional interface is particularly useful when you want to define a function that performs some actions over an instance of type T and doesn't return any value. The most typical usage is when you want to scroll all elements of a java.util.Iterable object and you want to perform an action over each element, and this is possible by just passing a lambda expression to the default method forEach exposed by the interface.

     Here is an example:

     List<String> myList = List.of("Element1", "Element2", "Element3");myList.forEach(s -> System.out.println(s));-

     As you can see, the above code just creates an immutable List of String elements, and the method forEach just perform the action specified by the Consumer in input (which is the lambda expression s -> System.out.println(s)), which simply prints each element of the list in the standard output. Of course there are infinite possibilities, but my intentions is just to give you an idea of what a Consumer is in Java.

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   • What is a constant in Java

     Top Answer

     Answered Feb 08, 2016 · 6 votes

     A constant is value that cannot be changed. For example 5, 0.5 , "abcd" etc.

     Lets consider Java :

     int i = 5; // Here 5 is constant but the reference (i) can change and point to 6. i.e, the value 5 is immutable, but the reference (i) is mutable.-

     Adding the final keyword to the above statement :

     final int i = 5; // Here the keyword final ensures that the reference cannot point to any other value. -

     Thus i becomes a compile time constant and its value is passed in the byte-code itself.

     Note that a reference could point to a constant value (immutable object ) or a mutable value.

     Technically speaking, immutable values aren't same as constants in case of reference types (except String).

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     3/5

   • What is a Contract in Java

     Top Answer

     Answered Jun 11, 2013 · 3 votes

     The contract here has the english meaning as well as the convention of "design by contract". The contract in terms of equals() and hashcode() method is found on the javadocs of Object - I am assuming you have read it.

     The wikipedia page is a must read for better understanding of "design by contract" paradigm. In Java, interfaces are typically defined to establish a contract which the implementation classes then have to abide by.

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     4/5

   • What is a Task in Java?

     Top Answer

     Answered Oct 09, 2017 · 7 votes

     Task is just a unit of work in the abstract sense. You have tasks of some type, and then you have mechanisms to perform those tasks in an asynchronous way.

     A simple example would be instances of Runnable or Callable (or even FutureTask if you want to have the name "task" in it) for the tasks, and an ExecutorService to run them.

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     5/5

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2. stackoverflow.com › questions › 1288708What are the containers in Java - Stack Overflow

   stackoverflow.com › questions › 1288708

   Apr 26, 2017 · "Containers are the interface between a component and the low-level platform-specific functionality that supports the component. Before a web component, enterprise bean, or application client component can be executed, it must be assembled into a Java EE module and deployed into its container."

3. docs.oracle.com › docs › apiContainer (Java Platform SE 8 ) - Oracle

   docs.oracle.com › docs › api

   • Cached

   public class Container. extends Component. A generic Abstract Window Toolkit (AWT) container object is a component that can contain other AWT components. Components added to a container are tracked in a list. The order of the list will define the components' front-to-back stacking order within the container.

4. www.tutorialspoint.com › what-is-the-importance-ofWhat is the importance of the Container class in Java?

   www.tutorialspoint.com › what-is-the-importance-of

   • Cached

   Feb 7, 2020 · A Container class can be described as a special component that can hold the gathering of the components. There are two types of Swing Containers, they are top-level containers and low-level containers. Top-Level containers are heavyweight containers such as JFrame, JApplet, JWindow, and JDialog.

   Code sample

   JTextField field;

   JButton btn;

   public ContainerTest() {

     setTitle("Container Test");

     panel = new JPanel();...

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5. www.javatpoint.com › difference-between-componentDifference Between Component and Container in Java

   www.javatpoint.com › difference-between-component

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   In summary, components and containers in Java are integral parts of GUI development. Components are the individual building blocks representing interactive or non-interactive elements, while containers serve as organizational tools for arranging and managing the layout of components.

6. www.javatpoint.com › containerContainer - javatpoint

   www.javatpoint.com › container

   • Cached

   The client/user can request only a static WebPages from the server. If the user wants to read the web pages as per input then the servlet container is used in java. The servlet container is the part of web server which can be run in a separate process.

7. www.geeksforgeeks.org › spring-understandingUnderstanding Inversion of Control with Example - GeeksforGeeks

   www.geeksforgeeks.org › spring-understanding

   • Cached

   Feb 18, 2022 · Spring IoC (Inversion of Control) Container is the core of Spring Framework. It creates the objects, configures and assembles their dependencies, manages their entire life cycle. The Container uses Dependency Injection (DI) to manage the components that make up the application.

8. People also ask

   How do you use the java .contains method?

   • The contains () method of List interface in Java is used for checking if the specified element exists in the given list or not. public boolean contains (Object obj) object-element to be searched for Parameters: This method accepts a single parameter obj whose presence in this list is to be tested.

   List contains() method in Java with Examples - GeeksforGeeks

   www.geeksforgeeks.org/list-contains-method-in-java-with-examples/

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   What is the return type of the contains method in Java?

   • contains () method is a built-in Java method that helps us check if a sequence of characters is present inside a given string or not. The return type of this method is boolean, thus returning true or false. It takes a single parameter,i.e., the sequence of characters to be searched.

   contains() in Java | contains() Function in Java - Scaler Topics

   www.scaler.com/topics/contains-in-java/

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   What is the syntax of the contains method in Java?

   • java.lang.String.contains () method searches the sequence of characters in the given string. It returns true if sequence of char values are found in this string otherwise returns false. public boolean contains (CharSequence sequence) { return indexOf (sequence.toString ()) > -1; }

   Java String contains() method with example - GeeksforGeeks

   www.geeksforgeeks.org/java-string-contains-method-example/

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   What are the parameters of the contains method in Java?

   • contains () method belongs to the Java String class. Here, ch represents the sequence of characters to be searched. Hence, the contains method is called on the given string. contains () method takes a single parameter. It is the sequence of characters that is to be searched. It can be a sequence of characters like string, StringBuffer, etc.

   contains() in Java | contains() Function in Java - Scaler Topics

   www.scaler.com/topics/contains-in-java/

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9. stackoverflow.com › questions › 7151206jakarta ee - Definition of a Java Container - Stack Overflow

   stackoverflow.com › questions › 7151206

   Aug 22, 2011 · A container is execution environment that brings dynamism. It creates HTTP response, converts HTTP request to an object and creates and manages servlet life cycle. Java EE is the collection of the specification that are used to solve enterprise problems like security, scalability, robustness, availability etc.