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,
InnerClassInstancethat has two inner classes,InnerClass1andInnerClass2. InnerClass1has an int field initialized to a value, and a methodint value()that returns its int field.InnerClass2has a String field, a constructor where it initializes its String field to the given String, and a methodString 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
InnerClassInstanceobject 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.
