Anonymous Inner class and lambda functions are not equal. Lambda Expression is not a replacement for Anonymous Inner Class.
package org.wesome.java8;
interface Apple {
void show();
}
class Fuji {
public static void main(String[] args) {
/*-----------------------Anonymous Inner Class-----------------------*/
Apple apple = new Apple() {
@Override
public void show() {
System.out.println("i love Apple");
}
};
apple.show();
/*-----------------------Lambda Expression-----------------------*/
Apple apple1 = () -> System.out.println("i love Apple");
apple1.show();
}
}| Anonymous Inner Class | Lambda Function | ||
|---|---|---|---|
| 1 | Anonymous inner class a class is a class without a name | Lambda expression a function without a name also known as Anonymous Function | |
| 2 | Anonymous inner class can implement an interface, extend the abstract and concrete class | Lambda expression can implement only functional interfaces | |
| 3 | the implemented interface can have any number of methods | Only a functional interface with the Single Abstract Method (SAM) can be implemented | |
| 4 | Anonymous inner class can declare an instance variable inside | Inside lambda expression all declared variables are local. | |
| 5 | Anonymous inner class can be instantiated | lambda functions cannot be instantiated | |
| 6 | Best choice if needs to implement the interface with multiple methods | Lambda expression is the best choice if needs to implement Single Abstract Method (SAM) | |
| 7 | The compiler will generate a separate class file for Anonymous inner class | Lambda expression is an anonymous function, hence no class file is generated | |
| 8 | Memory will be allocated in Heap Memory | Lambda Functions will be stored in the method area |
