Java构造函数和初始化类变量

Question

在 Java 中，类的构造函数是否创建该类的实例？如果是，它是否也初始化该类的变量？

Answer 1

Constructor doesn’t create the instance of the Class.

Instance creation is done using either:

  1.Using Class.forName()

  2.ClassLoader loadClass()

  3.Using clone()

  4.Deserialization

  5.Using reflection

  6.new keyword


Constructor in java is a special type of method that is used to initialize the object.

Java constructor is invoked at the time of object creation. It constructs the values i.e. provides data for the object that is why it is known as constructor.

Rules for creating java constructor

There are basically two rules defined for the constructor.

      1.Constructor name must be same as its class name

      2.Constructor must have no explicit return type

Types of java constructors

 There are two types of constructors:

     1.Default constructor (no-arg constructor)

     2.Parameterized constructor