This is an example of how to use an anonymous inner class. We have set an example following the above steps:
- We have created an abstract class,
Absthat has a constructor and an abstract method. - We have also created another class,
InnerClassConst, that has astaticmethod,getAbs(int i), that returns a newAbs, for a given int value, where it overrides thef()method ofAbsin order to print a message. - When calling a new Abs instance, calling
getAbs(int i)method ofInnerClassConst, it calls the overriden method in theAbsconstructor ofInnerClassConst,
as described in the code snippet below.
package com.javacodegeeks.snippets.core;
abstract class Abs {
public Abs(int i) {
System.out.println("Abs constructor, i = " + i);
}
public abstract void f();
}
public class InnerclassConst {
public static Abs getAbs(int i) {
return new Abs(i) {
{
System.out.println("Inside instance initializer");
}
@Override
public void f() {
System.out.println("In anonymous f()");
}
};
}
public static void main(String[] args) {
Abs a = getAbs(47);
a.f();
}
}
Output:
Abs constructor, i = 47
Inside instance initializer
In anonymous f()
This was an example of an anonymous inner class in Java.
