This is an example of how to make a reference to an inner class. In order to make a reference to an inner class we have created a class with inner classes, as described in the steps below:
- We have created a class,
InnerClass1that has an int field and a methodint value()that returns an int field. - We have also created a class,
InnerClass2that has a String field, and a constructor that initializes its String field to a given String. It has a methodString readLabel()that returns the String field of the class. - Both classes are inner classes of
ReferenceInnerClass. - The class has a method
InnerClass2 to(String s)that returns a newInnerClass2object initialized with the given String field. - It also has a method
InnerClass1 cont()that returns a newInnerClass1object initialized by its default constructor. - Another method of
ReferenceInnerClassisvoid ship(String dest), where it callscont()method to get a newInnerClsas1object and thento(String s)to get a newInnerClass2object and prints the the field ofInnerClass2using itsreadLabel()method. - We create a new instance of
ReferenceInnerClass, and call itsship(String dest)method with a given String. - Then we create a new
ReferenceInnerClassobject, and follow the same steps asship(String dest)method, but calling thecont()andto(String s)methods of the inner classes.
Let’s take a look at the code snippet that follows:
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 | package com.javacodegeeks.snippets.core;public class ReferenceInnerClass { class InnerClass1 { private int i = 11; public int value() {return i; } } class InnerClass2 { private String destination; InnerClass2(String where) {destination = where; } String readLabel() {return destination; } } public InnerClass2 to(String s) { return new InnerClass2(s); } public InnerClass1 cont() { return new InnerClass1(); } public void ship(String dest) { InnerClass1 c = cont(); InnerClass2 d = to(dest); System.out.println(d.readLabel()); } public static void main(String[] args) { ReferenceInnerClass p = new ReferenceInnerClass(); p.ship("Athens"); ReferenceInnerClass q = new ReferenceInnerClass(); // Defining references to inner classes: ReferenceInnerClass.InnerClass1 c = q.cont(); ReferenceInnerClass.InnerClass2 d = q.to("Thessaloniki"); }} |
This was an example of how to make a reference to an inner class in Java.
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