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This article mainly explains "how to understand java external classes and inner classes". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to understand java external classes and inner classes.

I. Internal class

An inner class defines a class An in class B. the inner class An is called the inner class, and the outer class B is called the outer class.

Member inner class definition format:

Class external class {

Class inner class {

}

}

Class A {class B {}}

In describing a thing, there is another thing that can be used in an inner class.

Access features:

1. Inner classes can directly access members of external classes, including private members.

2. If the external class wants to access the members of the inner class, it must establish the object of the inner class.

Create an inner class format:

External class. Inner class object name = new external type () .new internal type ()

Second, anonymous inner class

It is a simplified way to write an inner class. Its essence is an anonymous subclass object with a concrete implemented parent class or parent interface.

Anonymous inner class:

Format:

External class. Inner class object name = new external class (). Inner class () {method override}

Public class Test13 {public static void main (String [] args) {chide.kfc k = new chide (). New kfc (); / / external class object access internal class object belongs to internal class object creation format (external class. Inner class object name = new external class (). New internal class (); k.jitu (); chide c = new chide (); / / ordinary external class object c.maintiao (); System.out.println (c.money + "meta-true is not expensive"); new chide (). Maintiao (); / anonymous objects can only be used once format new external class (). Method name (); chide.kfc kc = new chide (). New kfc () {/ / Anonymous class format external class. Inner class object name = new external class (). Inner class () {method rewrite}; public void jitu () {System.out.println ("old hamburger");}}; / / because this is an assignment statement with semicolon kc.jitu () on the last large bracket +;}} class chide {/ / external class int money = 100 Public void maintiao () {System.out.println ("noodles-methods of the outer class");} class kfc {/ / inner class public void jitu () {System.out.println ("drumsticks-methods of the inner class") At this point, I believe you have a deeper understanding of "how to understand java external classes and internal classes". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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