Web Reference: 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 explicitly defined, Java provides a default constructor. Note that the constructor name must match the class name, and it cannot have a return type (like void). Also note that the constructor is called when the object is created. All classes have constructors by default: if you do not create a class constructor yourself, Java creates one for you. As with methods, the Java platform differentiates constructors on the basis of the number of arguments in the list and their types. You cannot write two constructors that have the same number and type of arguments for the same class, because the platform would not be able to tell them apart.
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