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Lambda expression

• Since Java SE 8
• clear and concise way to represent one method interface using an expression
• easier to iterate through, filter, and extract data from a Collection
• new concurrency features improve performance in multicore environments

Format

Argument List   Arrow Token   Body
(int x, int y)      ->        x + y

Example

public class RunnableTest {
  public static void main(String[] args) {

    // Anonymous Runnable
    Runnable r1 = new Runnable(){
      @Override
      public void run(){
        System.out.println("Hello world one!");
      }
    };

    // Lambda Runnable
    Runnable r2 = () -> System.out.println("Hello world two!");

    r1.run();
    r2.run();

   }
 }

ref

• http://www.oracle.com/webfolder/technetwork/tutorials/obe/java/Lambda-QuickStart/index.html
• Lambda calculus
  • https://en.wikipedia.org/wiki/Lambda_calculus

What Else?

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