Lambda expressions are the brand new feature of Java. Lambda expressions are introduced in Java 8 and it is a step towards facilitating functional programming in Java.
Lambda expressions help you to define a method without declaring it. So, you do not need a name for the method, return-type, and so on. Lambda expressions, like anonymous inner classes, provide the way to pass behaviors to functions. Lambda, however, is a much more concise way of writing the code.
For example, the preceding example of an anonymous inner class can be converted to Lambda as follows:
public class MyFilterImpl {
public static void main(String[] args) {
File dir = new File("src/main/java");
dir.list((dirname,name)->name.endsWith("java")); //Lambda Expression
}
} Note that the signature of the Lambda expression is exactly matching the signature of the accept method in the FilenameFilter interface.
