Lambda expression in java7 😳

Java is a popular programming language used to develop a wide range of applications. One of the most significant changes in Java 8 was the introduction of lambda expressions, which greatly simplified writing functional code. Lambda expressions provide a concise way to define an anonymous function that can be passed as an argument to a method.

Before Java 8, anonymous inner classes were used to represent the behavior of a function as an object. For example, the following code demonstrates how an interface with a single abstract method (a functional interface) could be implemented using an anonymous inner class:

interface MathOperation {
   int operation(int a, int b);
}

MathOperation addition = new MathOperation() {
   @Override
   public int operation(int a, int b) {
      return a + b;
   }
};

But with the advent of Java 8, the same code can be written as a lambda expression, making it much more concise and readable:

MathOperation addition = (int a, int b) -> a + b;

Lambda expressions can be used wherever functional interfaces are expected and provide a convenient way to pass behavior as an argument to a method. So, next time you’re writing code in Java 8 or later, consider using lambda expressions to make your code cleaner and more expressive! 💻🔥