Jan 13, 2022 · What is a default constructor? A default constructor is a constructor created by the compiler if we do not define any constructor (s) for a class. Here is an example: myStudent.firstName = "Ihechikara"; . myStudent.lastName = "Abba"; .

Oct 2, 2015 · Java provides a default constructor which takes no arguments and performs no special actions or initializations, when no explicit constructors are provided. The only action taken by the implicit default constructor is to call the superclass constructor using the super() call.

All classes have constructors by default: if you do not create a class constructor yourself, Java creates one for you. However, then you are not able to set initial values for object attributes. Constructors can also take parameters, which is used to initialize attributes. The following example adds an int y parameter to the constructor.

Mar 27, 2025 · Implicit Default Constructor: If no constructor is defined in a class, the Java compiler automatically provides a default constructor. This constructor doesn’t take any parameters and initializes the object with default values, such as 0 for numbers, null for objects.

Nov 15, 2015 · Generally, if you write a class and do not include any constructor, Java provides automatically for you a default constructor (one without parameters), which initializes all instance variables of the class (if there are any) with some default values (0, null, or false).

Jul 10, 2018 · But unlike C++, default constructor in Java initializes member data variable to default values (numeric values are initialized as 0, booleans are initialized as false and references are initialized as null). For example, output of the below program is. Test t = new Test(); // default constructor is called.

Sep 11, 2022 · If you don’t implement any constructor in your class, the Java compiler inserts default constructor into your code on your behalf. You will not see the default constructor in your source code(the .java file) as it is inserted during compilation and …

Oct 17, 2019 · What is Constructor in java & default constructor java? How to create a Constructor class and use it. Example with different scenarios in Java.

Aug 19, 2024 · In Java, a default constructor is an empty, no-argument constructor automatically inserted by the compiler into the code if no explicit constructor is defined in the class. For example, if we write: public class Student { private String name; }

Sep 6, 2023 · If we do not provide any constructor in the class, JVM provides a default constructor to the class during compile time. In the default constructor, the name of the constructor MUST match the class name, and it should not have any parameters.