Inheritance (full) of Java inner classes _java

Below through the example code to share with you about the Java internal classes of inheritance, specific details are as follows:

The constructor of the Java inner class must be connected to a reference to its Outer class object (the constructed inner class must give it a reference to an external class object). An inner class relies on an external class object, so it is necessary to manually add a call to the base class constructor in the constructor of the exported class when inheriting the inner class.

Because, when you export a class instantiation, there is no outer-class object that allows an instance of the exported class to be connected to it.

So, we need to create a perimeter class and then use a specific syntax to show the relationship between the inner class and the outer class.

In the following example, you need to inheritinner a reference from the outer class of the inner class to the derived class. Ordinary inheritance, you simply add super () to the export class constructor, and the inner class requires a peripheral class object reference. Super ();

Class withinner{
  class inner{}
 } public
 class Inheritinner extends withinner.inner{
  Inheritinner ( Withinner WI) {
     wi.super ();//wi parent class is Object
   } public
   static void Main (string[] args) {
    Withinner WI = new Withinner ();
    Inheritinner II = new Inheritinner (WI);
  }
 

And further, what happens when an inherited inner class has only a Non-default constructor?

Class withinner{
  class inner{public
    Inner (int i) {
      System.out.println (i);
    }
}} public class Inheritinner extends withinner.inner{
  inheritinner (Withinner wi) {
    int i=0;
    Wi.super (i);//As shown in the code, when the inherited constructor requires parameters, pass the parameter to this super function} public
  static void Main (string[] args) {
    Withinner WI = new Withinner ();
    Inheritinner II = new Inheritinner (WI);
  }
    

The above is the Java internal class inheritance detailed, hope to be able to help everybody.