JAVA: For Beginners, In 8 Hours, Learn Coding Fast! Java Programming Language Crash Course, Java Quick Start Guide, A Tutorial Book with Hands-On Projects In Easy Steps! An Ultimate Beginner's Guide! by Ray Yao

Author:Ray Yao
Language: eng
Format: azw3, pdf
Publisher: Rails Excel SharePoint AngularJS Access Lamp ActionScript VBA Photoshop Illustrator ColdFusion Teach Yourself
Published: 2017-08-06T07:00:00+00:00

Example 6.1

class parent_class{ // parent class

// define variable here;

// define method here;

}

class sub_class extends parent_class{ // sub class

// define variable here;

// define method here;

}

Explanation:

“class sub_class extends parent_class” means that a sub class extends a parent class (also called super class).

Sub class can access the variable and method in parent class, but cannot access the private variable and private method in parent class.

“super” keyword

In sub class, “super” is used to call the constructor of parent class.

super ( argument );

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