Sign Up

Continue with Facebook
Continue with Google
or use


Have an account? Sign In Now

Sign In

Continue with Facebook
Continue with Google
or use

Forgot Password?

Don't have account, Sign Up Here

Forgot Password

Lost your password? Please enter your email address. You will receive a link and will create a new password via email.

Have an account? Sign In Now

Please briefly explain why you feel this question should be reported.

Please briefly explain why you feel this answer should be reported.

Please briefly explain why you feel this user should be reported.

Sign InSign Up

WhatisWhatis

WhatisWhatis Logo WhatisWhatis Logo

WhatisWhatis Navigation

  • Blog
  • Write For Us
  • About Us
Search
Ask A Question

Mobile menu

Close
Ask A Question
  • Home
  • All Questions
  • Polls
  • Followers
  • FAQs
  • Add A Group
  • Add A Post
  • Blog
  • Write For Us
  • About Us
Home/Java

WhatisWhatis Latest Questions

Editor
  • 1
Editor
Asked: January 26, 2022In: Technology, Website Development

What Is A Class in Java?

  • 1

What is a class in Java? What are the types of classes in Java? Explain how to create a class in Java and other salient points?

ClassClass in JavaClass in Java DefinitionDefinitionExample of Class in Javahow to create class in javaJavatypes of classesVariableWhat Is A Class in Java
  1. Best Answer
    Prabhakar Atla
    Added an answer on January 26, 2022 at 3:25 pm

    What is a class in java? Class in Java refers to a specialized programming template, which is used to make new objects and define their data types and methods. You can also call it a blueprint, which facilitates the creation of other individual objects.   A class in Java can be attributed to a logicRead more

    What is a class in java?

    Class in Java refers to a specialized programming template, which is used to make new objects and define their data types and methods. You can also call it a blueprint, which facilitates the creation of other individual objects.  

    A class in Java can be attributed to a logical template, which helps to create objects with similar methods. All objects within the class also carry the same characteristics.  

    Rules You Must Follow While Creating Class in Java:

    • A class may be final or abstract. 
    • The components of a class are: class keyword and an identifier
    • You can indicate variables and methods within a Java class using curly braces. 

    Example of a class in Java

    Take for instance; Dogs. 

    A specific dog, like a Pomeranian, comes under the ‘object’ of the dogs. All dogs will share some similar features such as having a tail, white in colour, and many more.   

    Now once you create a class — “Dog.” You can’t go on to create a cricket match from it. Because when it comes to cricket matches, you need many more elements, including players, team name, venue name etc.  

    You can use Java constructors to initialize a new object in your Java class. You need to have at least a constructor—a default one by Java compiler or the one that you create. 

    Now that you have understood what is a class in java, let’s take a look at the types of classes in Java.

    What are the types of classes in Java?

    Local Variables:

    It often refers to temporary variables. They are often initialized and are available for garbage collection after the completion of the process.  

    Instance Variables:

    These are variables that are intrinsic to the object and can be easily entered into using any Java constructor, block or Java method.  

    Class Variables:

    Class variables are also called static variables in computer programming parlance. They also work like instance variables but they get created when the program starts and ends when it ends. 

    How to create a class in java?

    Now, we will look into the process of how to create a class in Java. 

    Here you have to use two keywords: class and the type that you want to define: 

    Main.java

    Create a class named “Main” with a variable x:

    public class Main {

      int x = 5;

    }

    Bonus Read: Class in Java 

    Every time you declare a class, use the class keyword. A class must contain data and a method to execute the command. The data within a class are called instance variables while the code that is executed is called methods.  

    In Conclusion: 

    Creating a class in Java is easy. You just have to make sure that you use “Class” for every class that you wish to create on Java. You can use this article for help.

    We hope you have now clearly understood the meaning of class in Java. For any additional queries or information on Java, please send in your comments. We will try to help you as much as possible.

    See less
      • 0
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
  • 1 Answer
  • 177 Views
aprabha2626
  • 0
aprabha2626
Asked: January 26, 2022In: Technology, Website Development

What Is A Constructor in Java?

  • 0

What is a constructor in Java? Explain its process and features. Define Java constructor overloading. How is the Java constructor different from the Java method?

ConstructorConstructor in Javaconstructor overloading in javaDifference between Java Method and Java ConstructorFeatures of Constructors in Javahow to make a constructor in javaJavaJava MethodTypes of Java ConstructorsWhat Is A Constructor in Java
  1. Best Answer
    Prabhakar Atla
    Added an answer on January 26, 2022 at 2:39 pm

    What is a constructor in Java? Many students want to know what is a constructor in Java. You will come across plenty of information online. However, if you wish to understand Java constructor in a simple and lucid language, you’ve come to the right place. We’ve made Java simpler for you to understanRead more

    What is a constructor in Java?

    Many students want to know what is a constructor in Java. You will come across plenty of information online. However, if you wish to understand Java constructor in a simple and lucid language, you’ve come to the right place. We’ve made Java simpler for you to understand, comprehend and even use practically on the computer. 

    A Java constructor refers to a series of codes, which is essential to specify the state of objects in the class. It helps in executing instance variables in that class. The only use of java constructor is to specify a particular task to data fields in the class. It can perform any action but it’s primarily responsible for managing or defining class in instance variables. 

    Types of Java Constructors

    • No-Arg Constructor or No Argument Constructor: You can’t include any argument in it. 
    • Default Constructor: You can create default Java constructor using Java compiler. It may or not accept arguments depending upon your purpose and requirement. 
    • Parameterized constructor: It must and always accepts arguments. 

    Features of Constructors in Java

    • The name of the constructor has to be defined and the same as the name of the class. 
    • The constructor must not return any value. 
    • If you don’t define a constructor in Java, the Java compiler will automatically assign standard values for all variables in the class. 

    How to make a constructor in Java?

    If you wish to make a default constructor in Java, use the following syntax coding: 

    Syntax of default constructor:

    <class_name>(){} 

    Rules and Essential Points

    • A Constructor name is always = class name.
    • A constructor shouldn’t be commanded to return type.
    • A Java Constructor can never be final, static, and abstract. 

    The Utility of Java Constructor

    • To set up a default value for each of the instance variables.
    • It’s important for initializing objects of a class.
    • It is useful to distribute appropriate memory to each object within the class.
    • You can execute the same code in the constructor. Mention it inside the constructor.

    Constructor Overloading in Java—Meaning and Significance

    In its simple terms, a Java constructor does actually refer to a ‘without return-type’ method. But it can also be overloaded to imitate a normal Java method. 

    Under constructor overloading in Java, multiple overloaders are used, each having a separate parameter list. Once executed, each constructor works and performs a different function. Compilers are used within the syntax to define their work and types. 

    Syntax of constructor overloading in java:

    class Main { 

      String language; 

      // constructor with no parameter

      Main() {

    this.language = “Java”;

      } 

      // constructor with a single parameter

      Main(String language) {

    this.language = language;

      } 

      public void getName() {

    System.out.println(“Programming Langauage: ” + this.language);

      } 

      public static void main(String[] args) { 

    // call constructor with no parameter

    Main obj1 = new Main(); 

    // call constructor with a single parameter

    Main obj2 = new Main(“Python”); 

    obj1.getName();

    obj2.getName();

      }

    }

    What is the Difference between Java Method and Java Constructor?

    Primarily, Java method always has a return type but a constructor doesn’t. Java method may or may not have the same name as the class, but the name of a constructor must be the same as its class and finally, Java method reflects how an object works, but a constructor just initialises the object. 

    In Conclusion:

    Constructor in Java is a significant topic. It holds the key to mastering the Java language and performing various functions on it. Java constructor in many cases works exactly the same as a normal Java method. If you start using Java constructor regularly for your programming or Java projects, you will easily understand everything about it. 

    Always remember that in many cases, Java method and Java constructor work similarly; however, they are not completely same all the time.

    See less
      • 0
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
  • 1 Answer
  • 164 Views
Prabhakar Atla
  • 0
Prabhakar Atla
Asked: January 23, 2022In: Technology, Website Development

What Is Object In Java?

  • 0

What is an object in Java? Explain its meaning with all essential points. How does object differ from class in Java?

DefinitionJavaObjectObject DefinitionObject In JavaObject Oriented ProgrammingOOPSWhat is ObjectWhat Is Object In Java
  1. Best Answer
    Prabhakar Atla
    Added an answer on January 23, 2022 at 6:32 am

    What is Object in Java? The simple meaning of the object in English refers to any ‘thing.’ But in Java, it has a completely different meaning. In Java and OOPS (Object Oriented Programming Concepts), it refers to all those characteristics and processes to make any raw data useful for further interprRead more

    What is Object in Java?

    The simple meaning of the object in English refers to any ‘thing.’ But in Java, it has a completely different meaning. In Java and OOPS (Object Oriented Programming Concepts), it refers to all those characteristics and processes to make any raw data useful for further interpretation. 

    When you type a message for an object, you are commanding the system to implement a method as specified in the class. An object can be a variable, functional key, data structure and much more. 

    Java objects are often put under class hierarchies. 

    How Does Object Differ From Class in Java? 

    A Class is often referred to as a prototype through which all variables and functions are defined. It is common for all objects based on Java. Programming objects are just like real-life world objects you see in your daily life. Objects in OOPS come under a Class itself. 

    In Conclusion:

    In OOPS or Object-Oriented Programming Concepts, objects are defined as things that first come to your mind while creating a software program using codes and various processes. Each object works as a generic class of object and can also be reused while defining class in their codes. An object can be referred to as anything and everything that runs on a computer.

    See less
      • 0
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
  • 1 Answer
  • 180 Views
Prabhakar Atla
  • 1
Prabhakar Atla
Asked: December 10, 2021In: Technology, Website Development

What Is The Definition of a Static Member?

  • 1

What Does It Mean to Have Static Members? In Java and C++, what do you mean by static members? What are the characteristics and features of a static member?

C++Definitionfeatures of a static memberJavaStatic MemberStatic Member DefinitionStatic Member MeaningWhat Does It Mean to Have Static Members? In Java and C++
  1. Best Answer
    Prabhakar Atla
    Added an answer on December 10, 2021 at 6:37 am

    Static Members Definition: Static members are data members (variables) or methods that belong to the class itself rather than to its objects. Regardless of where and how they are used, static members always remain the same. Because static members are associated with the class, no instance of that clRead more

    Static Members Definition:

    Static members are data members (variables) or methods that belong to the class itself rather than to its objects. Regardless of where and how they are used, static members always remain the same. Because static members are associated with the class, no instance of that class is required to invoke them.

    In languages such as C# and Java, we can invoke static methods with the syntax clsName.Cls Name(args), where month name is the static method name and cls Name is the class name. Static variables can be accessed by using their class name: cls Name.Var Name, where Var Name is the name of the static variable.

    In Java, a static member is a class member that isn’t connected with a class instance. Instead, every single is a class member. As a result, there is no need for a class instance to control the static member. The value of a static field remains constant across all instances of the class.

    C++ data members that are static:

    Static data members are members of a class that has the static keyword expressed. The properties of a static member are unique. These are the given below, have a look:

    • No matter how many objects are produced, only one copy of that member is made for the entire class and shared by all.
    • It’s set up before any of this class’s objects are produced, even before the main starts.
    • It is only visible within the class, but it lasts the entire program.

    There is only a single copy of a static variable in memory because it is connected to a class. All objects in that class share this copy.

    The following are some of the characteristics of static members:

    • All static members of the contained class, including private members, are accessible to a static member.
    • Access control modifiers can be used to declare a static member.
    • Without qualifying its name with the name of the contained class, a static member class can use any other static member.
    • Any of the surrounding classes cannot have the same name as a static member class. Only top-level classes and other static member classes and interfaces can define static member classes and interfaces.
    See less
      • 0
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
  • 1 Answer
  • 166 Views
Prabhakar Atla
  • 0
Prabhakar Atla
Asked: December 8, 2021In: Technology, Website Development

What is the definition of Exception Handling?

  • 0

How can you understand the definition of exception handling? What does exception handling do? Is exception handling an unanticipated event? How many exceptions in Java are there?

Definitiondefinition of Exception Handlingexception handlerException HandlingException Handling MeaningJava
  1. Best Answer
    Prabhakar Atla
    Added an answer on December 8, 2021 at 7:17 am

    Definition of Exception Handling: An exception handler is a piece of code that specifies what a program should do when an unexpected event interrupts the normal flow of its instructions. In the context of computers, an exception is an unanticipated event that occurs during the execution of a programRead more

    Definition of Exception Handling:

    An exception handler is a piece of code that specifies what a program should do when an unexpected event interrupts the normal flow of its instructions. In the context of computers, an exception is an unanticipated event that occurs during the execution of a program and disturbs the flow of its commands.

    There are two sorts of exceptions in Java:

    • Checked exceptions are ones that are examined when the code is developed; for the most part, the program is expected to rebound from them, or exception handlers are inserted into programs to specify what the program should do when certain circumstances are met.
    • Unchecked exceptions are unanticipated events that occur during the execution of a program. These can be managed in certain circumstances, but not in most. One sort of uncontrolled exception is an error. 

    Programs connect with the operating system and other software systems through multiple levels. When a checked exception occurs, the procedure that caused it creates this exception object that contains information such as the type of exception and the state of the program at the time of the occurrence.

    Throwing an exception refers to the creation and subsequent passing of this item. The method sends the object to the runtime system, which examines the exception handler code levels that satisfy the exception object’s specifications. The exception handler is said to catch an exception in this scenario.

    The operating system creates a fatal exception message if an adequate exception handler cannot be identified, which implies the program must close and maybe the computer as well.

    See less
      • 0
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
  • 1 Answer
  • 201 Views
Prabhakar Atla
  • 0
Prabhakar Atla
Asked: December 8, 2021In: Technology, Website Development

What is the JIT Compiler?

  • 0

What can you understand by JIT Compiler? Why does the java application run slow? Can you define what JIT Compiler necessitates? What is the procedure compiled of? How does the JIT Compiler maintain high performance?

DefinitionJavaJIT CompilerJIT Compiler DefinitionJIT Compiler Meaning
  1. Best Answer
    Prabhakar Atla
    Added an answer on December 8, 2021 at 6:55 am

    JIT Compiler Definition: The JIT compiler is a runtime environment component that boosts JavaTM program performance by converting bytecode to native machine code at runtime. Platform-neutral bytecodes are involved in Java classes, which a JVM can stop on a range of computer architectures. The JVM loRead more

    JIT Compiler Definition:

    The JIT compiler is a runtime environment component that boosts JavaTM program performance by converting bytecode to native machine code at runtime.

    Platform-neutral bytecodes are involved in Java classes, which a JVM can stop on a range of computer architectures. The JVM loads the class file assessment at runtime assesses each bytecode’s semantics and performs the required computations.

    A Java application runs slower than a native application due to the increased CPU and memory usage during interpretation. By translating bytecodes into native machine code at runtime, the JIT compiler aids in the performance of Java programs.

    By default, the JIT compiler is on. When a method is compiled, the JVM directly calls the compiled code of that function instead of interpreting it. Compiling every method may theoretically allow the Java program’s speed to approach that of a native application if compilation did not want processing time or memory usage.

    JIT compilation necessitates the use of both the processor and memory. Thousands of methods are invoked when the JVM first starts up. Even if the software eventually achieves extremely good peak performance, compiling all of these functions might greatly impact start-up time.

    The first time a method is invoked, it is not compiled. The JVM keeps track of each method’s invocation count, starting at a specified compilation threshold and decreasing with each call. A just-in-time compilation for the method is triggered when the number of invocations hits zero.

    As a result, frequently used methods are compiled immediately after the JVM starts, but less frequently used methods are produced considerably later, if at all. The JIT compilation threshold enables the JVM to start rapidly while maintaining high performance. The threshold was chosen to achieve the best possible start-up times and long-term performance balance.

    Different techniques can be used to recompile a method to a higher level of optimization. Sampling is one of these mechanisms: the JIT compiler runs a specialized sampling thread that wakes up on a regular basis to detect which Java methods appear at the top of the stack more frequently. Such methods are thought to be more crucial for performance and thus are candidates for re-optimization at the hot, very hot, or scorching levels.

    A procedure can be compiled at multiple optimization levels with the JIT compiler: cold, warm, hot, veryHot, or scorching. Larger optimization levels are supposed to deliver improved speed, but they also come with a higher CPU and memory compilation cost. A method’s initial or default optimization level is warm, but JIT heuristics may lower it to cold to improve start up time.

    See less
      • 0
    • Share
      Share
      • Share on Facebook
      • Share on Twitter
      • Share on LinkedIn
      • Share on WhatsApp
  • 1 Answer
  • 169 Views

Sidebar

Ask A Question
Add A Post
Create A New Group

Categories

Our Figures

  • Questions 1k
  • Answers 1k
  • Posts 1k
  • Comments 92
  • Best Answers 1k
  • Users 13k

Explore

  • Home
  • All Questions
  • Polls
  • Followers
  • FAQs
  • Add A Group
  • Add A Post

Footer

About Us

WhatisWhatis.com is trying to become one of the best question and answer platforms out there, which will help you establish your community and connect with other people.

Our Pages

  • About Us
  • Blog
  • Contact Us
  • Frequently Asked Questions (FAQs)
  • Homepage
  • Privacy Policy
  • Write For Us To Submit A Guest Post Article on Technology, Education, Health, Apps, Gadgets, IoT, AI, Business, Digital Marketing and More!

Subscribe For Us

DMCA.com Protection Status

Our Feeds

Sitemap

RSS Feeds

Follow Us Here

[njwa_button id="80129"]

© 2019 - 2022 All rights reserved By WhatisWhatis.com