Inner class instance example

In this example we shall show you how to call an inner classe’s instance in a class. To call an inner class instance in a class, we must first create an instance of the outer class, and then create an instance of the inner class, as described in the example:

• We have created a class, InnerClassInstance that has two inner classes, InnerClass1 and InnerClass2.
• InnerClass1 has an int field initialized to a value, and a method int value() that returns its int field.
• InnerClass2 has a String field, a constructor where it initializes its String field to the given String, and a method String readLabel() that returns its String field.
• We create a new instance of InnerClassInstance.
• Then we create a new instance of each one of the inner classes, using the InnerClassInstance object and its inner classe’s constructors,

as described in the code snippet below.  

package com.javacodegeeks.snippets.core;

public class InnerClassInstance {

    class InnerClass1 {


  private int i = 11;


  public int value() {


return i;

  }
    }

    class InnerClass2 {


  private String dest;


  InnerClass2(String whereTo) {


dest = whereTo;

  }


  String readLabel() {


return dest;

  }
    }

    public static void main(String[] args) {

  

  InnerClassInstance p = new InnerClassInstance();

  

  // Must use instance of outer class

  // to create an instances of the inner class:

  InnerClassInstance.InnerClass1 c = p.new InnerClass1();

  InnerClassInstance.InnerClass2 d = p.new InnerClass2("Greece");
    }
}

  
This was an example of how to call an inner classe’s instance in a class in Java.