Java Constructors: Initializing Objects and Differences from Ordinary Methods

A Java constructor is a special method used to initialize objects. It has the following characteristics: it shares the same name as the class, has no return value (no void), is automatically called when an object is created (via new), and cannot be modified with static or other modifiers. Its purpose is to assign initial values to an object's member variables. Constructors are categorized into parameterless (default provided if no other constructors exist) and parameterized (for flexible parameter passing). Differences from ordinary methods: Constructors have no return value, are automatically invoked, and only initialize attributes; ordinary methods have return values, are manually called, and define behaviors. Constructors cannot be inherited, while ordinary methods can be inherited and overridden. Note: The default parameterless constructor only exists if no other constructors are defined. Constructors cannot be called independently but can be overloaded (with different parameters). Mastering constructors ensures correct object initialization and avoids errors such as the disappearance of the default constructor.