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Java Technologies Computer Programming BCA B.SC/IT ...
79 followers study24x7 18 May 2020 03:10 AM study24x7 study24x7

Top YouTube channel to learn Java.

Top YouTube channel to learn Java.
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79 followers study24x7 14 May 2020 10:13 PM study24x7 study24x7

What is vaadin.....?
As a widely used Web UI Framework, Vaadin enables Java programmers to build and maintain a variety of web applications rapidly. Like other Java web frameworks, Vaadin comes with features to simplify and speed up web application development. It is also compatible with major operating systems, web browsers, and web servers. But Vaadin, unlike other Java web frameworks, features a server-side architecture. The server-side architecture enables programmers to run most business logic on the webserver. Also, the Java developers can make the application deliver interactive user experience by running AJAX on web browsers. They can write user interfaces in Java programming language without using client-side web technologies like HTML and JavaScript. At the same time, they can simplify web application development by availing the UI designer, dashboard, data visualization tools, and add-on components provided by the web framework.

What is vaadin.....?<br>As a widely used Web UI Frame...
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  • A k
  • Any company which is using it
  • Hridendra Srivastava
  • Yes it is very dynamic and easy to implement
  • Ankit Khandelwal
  • How is it better than web framework like angular and other
    79 followers study24x7 21 Mar 2020 12:29 AM study24x7 study24x7

    What is the default load factor of HashMap........?

    A

    0.75

    B

    0.80

    C

    75

    D

    2.5

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    79 followers study24x7 26 Feb 2020 04:25 PM study24x7 study24x7

    ๐—Ÿ๐—ถ๐˜€๐˜ ๐˜๐—ต๐—ฒ ๐—ณ๐—ฒ๐—ฎ๐˜๐˜‚๐—ฟ๐—ฒ๐˜€ ๐—ผ๐—ณ ๐—๐—ฎ๐˜ƒ๐—ฎ ๐—ฃ๐—ฟ๐—ผ๐—ด๐—ฟ๐—ฎ๐—บ๐—บ๐—ถ๐—ป๐—ด ๐—น๐—ฎ๐—ป๐—ด๐˜‚๐—ฎ๐—ด๐—ฒ.
    There are the following features in Java Programming Language. ๐‘บ๐’Š๐’Ž๐’‘๐’๐’†: Java is easy to learn. The syntax of Java is based on C++ which makes easier to write the program in it. ๐‘ถ๐’ƒ๐’‹๐’†๐’„๐’•-๐‘ถ๐’“๐’Š๐’†๐’๐’•๐’†๐’…: Java follows the object-oriented paradigm which allows us to maintain our code as the combination of different type of objects that incorporates both data and behaviour. ๐‘ท๐’๐’“๐’•๐’‚๐’ƒ๐’๐’†: Java supports the read-once-write-anywhere approach. We can execute the Java program on every machine. Java program (.java) is converted to bytecode (.class) which can be easily run on every machine. ๐‘ท๐’๐’‚๐’•๐’‡๐’๐’“๐’Ž ๐‘ฐ๐’๐’…๐’†๐’‘๐’†๐’๐’…๐’†๐’๐’•: Java is a platform-independent programming language. It is different from other programming languages like C and C++ which needs a platform to be executed. Java comes with its platform on which its code is executed. Java doesn't depend upon the operating system to be executed. ๐‘บ๐’†๐’„๐’–๐’“๐’†๐’…: Java is secured because it doesn't use explicit pointers. Java also provides the concept of ByteCode and Exception handling which makes it more secured. ๐‘น๐’๐’ƒ๐’–๐’”๐’•: Java is a strong programming language as it uses strong memory management. The concepts like Automatic garbage collection, Exception handling, etc. make it more robust. ๐‘จ๐’“๐’„๐’‰๐’Š๐’•๐’†๐’„๐’•๐’–๐’“๐’† ๐‘ต๐’†๐’–๐’•๐’“๐’‚๐’: Java is architectural neutral as it is not dependent on the architecture. In C, the size of data types may vary according to the architecture (32 bit or 64 bit) which doesn't exist in Java. ๐‘ฐ๐’๐’•๐’†๐’“๐’‘๐’“๐’†๐’•๐’†๐’…: Java uses the Just-in-time (JIT) interpreter along with the compiler for the program execution. ๐‘ฏ๐’Š๐’ˆ๐’‰ ๐‘ท๐’†๐’“๐’‡๐’๐’“๐’Ž๐’‚๐’๐’„๐’†: Java is faster than other traditional interpreted programming languages because Java bytecode is "close" to native code. It is still a little bit slower than a compiled language (e.g., C++). ๐‘ด๐’–๐’๐’•๐’Š๐’•๐’‰๐’“๐’†๐’‚๐’…๐’†๐’…: We can write Java programs that deal with many tasks at once by defining multiple threads. The main advantage of multi-threading is that it doesn't occupy memory for each thread. It shares a common memory area. Threads are important for multi-media, Web applications, etc. ๐‘ซ๐’Š๐’”๐’•๐’“๐’Š๐’ƒ๐’–๐’•๐’†๐’…: Java is distributed because it facilitates users to create distributed applications in Java. RMI and EJB are used for creating distributed applications. This feature of Java makes us able to access files by calling the methods from any machine on the internet. ๐‘ซ๐’š๐’๐’‚๐’Ž๐’Š๐’„: Java is a dynamic language. It supports dynamic loading of classes. It means classes are loaded on demand. It also supports functions from its native languages, i.e., C and C++.

    ๐—Ÿ๐—ถ๐˜€๐˜ ๐˜๐—ต๐—ฒ ๐—ณ๐—ฒ๐—ฎ๐˜๐˜‚๐—...
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    79 followers study24x7 21 Feb 2020 11:33 AM study24x7 study24x7

    What do you understand by Java virtual machine?

    Java Virtual Machine is a virtual machine that enables the computer to run the Java program. JVM acts like a run-time engine which calls the main method present in the Java code. JVM is the specification which must be implemented in the computer system. The Java code is compiled by JVM to be a Bytecode which is machine-independent and close to the native code.

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    79 followers study24x7 21 Feb 2020 11:26 AM study24x7 study24x7

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    79 followers study24x7 22 Jan 2020 12:18 PM study24x7 study24x7

    What is map.entry ..?

    A map entry (key-value pair). The Map.entrySet method returns a collection-view of the map, whose elements are of this class. The only way to obtain a reference to a map entry is from the iterator of this collection-view. These Map.Entry objects are valid only for the duration of the iteration; more formally, the behavior of a map entry is undefined if the backing map has been modified after the entry was returned by the iterator, except through the setValue operation on the map entry.

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    79 followers study24x7 31 Dec 2019 12:38 PM study24x7 study24x7

    Facts on Design Pattern
    โžกChristopher Alexander was the first person who invented all the above Design Patterns in 1977. 
    โžกBut later the Gang of Four - Design patterns, elements of reusable object-oriented software book was written by a group of four persons named Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides in 1995.
    โžกThat's why all the above 23 Design Patterns are known as Gang of Four (GoF) Design Patterns.

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    79 followers study24x7 27 Dec 2019 04:36 PM study24x7 study24x7

    Java is a blue collar language. Itโ€™s not a PhD thesis material but a language for a job.
    --James Gosling

    Java is a blue collar language. Itโ€™s not a PhD thes...
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    79 followers study24x7 07 Dec 2019 11:34 AM study24x7 study24x7

    How instance variables are different from class variables.....? Instance variables are declared in a class, but outside a method, constructor or any block. ... Instance variables are created when an object is created with the use of the keyword 'new' and destroyed when the object is destroyed. Static variables are created when the program starts and destroyed when the program stops.

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    79 followers study24x7 06 Dec 2019 05:05 PM study24x7 study24x7

    HashMap VS HashTable

    HashMap VS HashTable
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    79 followers study24x7 06 Dec 2019 03:21 PM study24x7 study24x7

    Why Map interface doesnโ€™t extend the Collection interface......? 

    โœ Although Map interface and its implementations are part of the Collections Framework, Map is not collections and collections are not Map. Hence it doesnโ€™t make sense for Map to extend Collection or vice versa. If Map extends Collection interface, then where are the elements? The map contains key-value pairs and it provides methods to retrieve the list of Keys or values as Collection but it doesnโ€™t fit into the โ€œgroup of elementsโ€ paradigm.

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    79 followers study24x7 05 Dec 2019 06:48 PM study24x7 study24x7

    What is the default load factor of HashMap?
    Default initial capacity of the HashMap takes is 16 and load factor is 0.75f (i.e 75% of current map size). The load factor represents at what level the HashMap capacity should be doubled.

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    79 followers study24x7 05 Dec 2019 06:13 PM study24x7 study24x7

    Marker Interface in java is an interface with no fields or methods within it. It is used to convey to the JVM that the class implementing an interface of this category will have some special behavior. Hence, an empty interface in java is called a marker interface. A marker interface is used as a tag to inform a message to the Java compiler so that it can add special behavior to the class implementing it. Java marker interface has no members in it. Let's take the java.io.Serializable marker interface.

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