Java Programming Ideas----constructors

1. What is a constructor

When we create an object, Java always initializes some variables, methods, and calls an initialization function.

And this initialization function can also be written by ourselves.

2. Default constructor

Constructors that do not accept any arguments are called the default constructors.

3, the name of the constructor

The name of the constructor and the names of the classes are the same.

Like what:

Public  class AA {int a;int b; AA () {  a = 2;b = 3; System.out.println ("Hello World");}

4, the constructor is not a return value.

5, the constructor of the initialization function, you can have parameters.

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Java Programming Ideas----constructors