With this example we are going to demonstrate how to make an inner class reference. In short, to make an inner class reference we have followed the above steps:
- We have created a class
InnerClassRef, that contains an inner classCand another inner classD. - Class
Chas a methodvalue()that returns an int value. - Class
Dhas a methodreadLabel()that returns a String value. - Class
InnerClassRefhas two methods,to(String s)that returns aD, andcont()that returns aC. It also has a methodboat(String dest)that creates a newCand a newDinstance, usingcont()andto(String s)methods. - We create a new instance of
InnerClassRefand call itsboat(String s)method with a given String. - Then we define the references to the inner classes of
InnerClassRefusingcont()andto(String s)methods ofInnerClassRef.
Let’s take a look at the code snippet that follows:
package com.javacodegeeks.snippets.core;
public class InnerClassRef {
public static void main(String[] args) {
InnerClassRef inner1 = new InnerClassRef();
inner1.boat("Athens");
InnerClassRef inner2 = new InnerClassRef();
// Defining references to inner classes:
InnerClassRef.C c = inner2.cont();
InnerClassRef.D d = inner2.to("Thessaloniki");
}
class C {
private int i = 11;
public int value() {
return i;
}
}
class D {
private String str;
D(String whereTo) {
str = whereTo;
}
String readLabel() {
return str;
}
}
public D to(String s) {
return new D(s);
}
public C cont() {
return new C();
}
public void boat(String dest) {
C c = cont();
D d = to(dest);
System.out.println(d.readLabel());
}
}
Output:
Athens
This was an example of how to make an inner class reference in Java.
