Java thread lambda code example

Example 1: java anonymous thread lambda

public class LambdaThreadTest {
   public static void main(String args[]) {
      // Child thread
      new Thread(() -> { // Lambda Expression
         for(int i=1; i <= 5; i++) {
            System.out.println("Child Thread: "+ i);
            try {
               Thread.sleep(500);
            } catch(Exception e) {
               e.printStackTrace();
            }
         }
      }).start();
      // Main Thead
      for(int j=1; j < 5; j++) {
         System.out.println("Main Thread: "+ j);
         try {
            Thread.sleep(500);
         } catch(Exception e) {
            e.printStackTrace();
         }
      }
   }
}

Example 2: lambda expressions in java

A lambda expression is a short block 
of code which takes in parameters
and returns a value. Lambda expressions
are similar to methods, but they do
not need a name and they can be
implemented right in the body of a method.

parameter -> expression

To use more than one parameter, wrap them in parentheses:

(parameter1, parameter2) -> expression

Example
Use a lamba expression in the ArrayList's 
forEach() method to print every item in the list:

import java.util.ArrayList;

public class Main {
  public static void main(String[] args) {
    ArrayList<Integer> numbers = new ArrayList<Integer>();
    numbers.add(5);
    numbers.add(9);
    numbers.add(8);
    numbers.add(1);
    numbers.forEach( (n) -> { System.out.println(n); } );
  }
}