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Java 8 lambdas

A collection of 3 issues

Distinct elements in Java 8 streams

Finding the distinct elements of a Java stream is easy. We can use the distinct method: List words = Arrays.asList("hello", "Java8", "world!", "hello); List distinctWords = words.stream() .distinct() .collect(Collectors.toList()); // ["hello", "Java8", "world!"] The first part of the code example filters the non-empty strings and counts

Sort a collection with lambda comparator

With Java 8 we can use a lambda expression to implement a Comparator for sorting a collection: class Person { public String name; public int age; } // TODO we should add some persons to this list List persons = new ArrayList<>(); // Using a lambda expression to implement the Comparator Collections.sort(persons,

Java 8 Lambda expressions

Let's create and run some Runnable! With Java 8, instead of using anonymous classes, we can use lambda expressions. The syntax (params) -> statement can be used to create an instance of Runnable by implementing its run method. This is possible only for interfaces that have only one abstract method,