One month with Kotlin: lambda example

lambdaExample.java

// Using Lambdas on Kotlin

val items = ArrayList<String>()
items.sortBy { item -> 
 item.length() 
}
//or more implicity
items.sortBy { it.length() }

//------------------------------------------------------------------------------

// Using the nearest from Lambdas in Java 7

ArrayList<String> items = ArrayList();
Collections.sort(items, new Comparator<String>(){
 @Override
 public int compare(String s1, String s2) {
  return s1.length() - s2.length();
 }
});

// Using the nearest from Lambdas in Java 8 (there were no lambdas in Java 7)
List items = new ArrayList<>();
items.sort(Comparator.comparingInt(String::length));