Efficient linked lists in .NET

December 12, 2017 1 Comment

Sometimes you need a collection that’s modified a lot: you insert, update and remove items. A List of T is then inefficient as it needs to constantly rearrange all other items. The LinkedList class might be a better candidate.

A linked list is a doubly-linked list. Each item has a Next and Previous pointer to look at which element comes right before and after a particular object in the list. A linked list is very efficient at inserting and deleting items in particular.

Initialisation:

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Filed under .NET, Generics Tagged with ,

Concatenate strings with the StringJoiner class in Java 8

December 10, 2017 Leave a comment

Java 8 introduces a new object which enables you to join individual strings: the StringJoiner.

The StringJoiner has two overloads. The simpler one accepts a delimiter:

StringJoiner sj = new StringJoiner(" | ");
sj.add("Hello").add("my").add("dear").add("world!");

System.out.println(sj.toString());

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Default interface functions in Java 8

December 9, 2017 Leave a comment

Introduction

A new feature in Java 8 is default function implementations. They are default implementations of methods of an interface. Default methods can help extending an interface without breaking the existing implementations. After all if you add a new method to an interface then all implementing types must handle it otherwise the compiler will complain.

This can be cumbersome if your interface has a large number of consumers. You’ll break their code and they will need to implement the new function – which they might not even need.

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