The Java language spec lists 10 Java constructor types, including default, no-args, canonical, private parameterized, generic, overloaded and anonymous.

Classes and objects in Java must be initialized before they are used. You’ve previously learned that class fields are initialized to default values when classes are loaded, and that objects are ...

A constructor initializes an object when it is created. It has the same name as its class and is syntactically similar to a method. However, constructors have no explicit return type. Typically, you ...

A default constructor is generated only if a class contains no explicit constructors, so a class can be made noninstantiable by including a private constructor: 译注：原文 noninstantiable 应修改为 ...