Open links in new tab
    • Work Report
    • Email
    • Rewrite
    • Speech
    • Title Generator
    • Smart Reply
    • Poem
    • Essay
    • Joke
    • Instagram Post
    • X Post
    • Facebook Post
    • Story
    • Cover Letter
    • Resume
    • Job Description
    • Recommendation Letter
    • Resignation Letter
    • Invitation Letter
    • Greeting Message
    • Try more templates
  1. 123

    A constructor in Java is a special method used to initialize objects. It is automatically invoked when an object is created using the new keyword. A constructor:

    • Has the same name as the class.

    • Does not have a return type (not even void).

    • Can be overloaded but not overridden.

    1. Default Constructor A constructor with no parameters. If no constructor is defined, Java automatically provides one.

    class Demo {
    Demo() {
    System.out.println("Default constructor");
    }
    public static void main(String[] args) {
    Demo obj = new Demo();
    }
    }
    Copied!

    Output: Default constructor

    2. Parameterized Constructor Accepts parameters to initialize object properties.

    class Demo {
    String name;
    int id;
    Demo(String name, int id) {
    this.name = name;
    this.id = id;
    }
    public static void main(String[] args) {
    Demo obj = new Demo("Alice", 101);
    System.out.println(obj.name + " - " + obj.id);
    }
    }
    Copied!

    Output: Alice - 101

    3. Copy Constructor Initializes a new object by copying data from another object.

    Feedback
  2. W3School
    https://www.w3schools.com › java › java_constructors.asp

    Java Constructors - W3Schools

    Learn how to create and use constructors in Java to initialize objects. Constructors can take parameters, match class names, and have no return type.

    • The W3Schools online code editor allows you to edit code and view the result in …

    • Show AnswerHide Answer Submit Answer » What is an Exercise? To try more JAVA …

    • Java User Input The Scanner class is used to get user input, and it is found in the …

    • The public keyword is an access modifier, meaning that it is used to set the access …

    See results only from w3schools.com
  3. GeeksForGeeks
    https://www.geeksforgeeks.org › java › constructors-in-java

    Java Constructors - GeeksforGeeks

    Mar 26, 2026 · There are four types of constructors in Java. 1. Default Constructor. A default constructor has no parameters. It’s used to assign default values to an object. If no constructor is …

  4. Programiz
    https://www.programiz.com › java-programming › constructors

    Java Constructors (With Examples) - Programiz

    • A Java constructor can also accept one or more parameters. Such constructors are known as parameterized constructors (constructors with parameters).
    See more on programiz.com
    • boolean: false
    • float: 0.0f
    • char: \u0000
    • long: 0L
  5. oracle.com
    https://docs.oracle.com › javase › tutorial › java › ...

    Providing Constructors for Your Classes (The Java™ Tutorials - Oracle

    Learn how to declare and use constructors to create objects from a class blueprint in Java. See examples of constructors with different argument lists, default constructors, and superclass …

  6. TutorialsPoint
    https://www.tutorialspoint.com › java › java_constructors

    Java - Constructors - Online Tutorials Library

    Java constructors are special types of methods that are used to initialize an object when it is created. It has the same name as its class and is syntactically similar …

  7. FreeCodecamp
    https://www.freecodecamp.org › news › how-to-use...

    How to Use Constructors in Java: A Beginner's Guide

    Jul 8, 2025 · Constructors are special types of methods with no return type. They are basically used to initialise the object, to set up its internal state, or to assign …

  8. People also ask
    Unable to load answer

    Feedback
  9. DataCamp
    https://www.datacamp.com › doc › java › constructors

    Java Constructors - DataCamp

    Learn about Java constructors, their types, syntax, and examples. Understand default, no-argument, parameterized, and copy constructors for effective object initialization in Java programming.

  10. Baeldung
    https://www.baeldung.com › java-constructors

    A Guide to Constructors in Java - Baeldung

    Jan 8, 2024 · Learn how to use constructors to initialize and encapsulate the state of objects in Java. See examples of no-argument, parameterized, copy, chained …

  11. javahandson.com
    https://javahandson.com › constructors-in-java

    Constructors in Java - Java-HandsOn

    Apr 20, 2025 · Understand constructors in Java, their types, overloading, rules, and how they differ from static blocks with examples to enhance your Java coding skills.

  12. NxtWave
    https://www.ccbp.in › blog › articles › constructor-in-java

    Constructor in Java: Types, Examples, Overloading & Key ... - NxtWave

    Learn constructor in Java with types, examples, overloading, and differences from methods. Build strong OOP concepts easily.

Content was generated with AI. Learn more