If you need some convincing of the claim that default was introduced due to lambdas, note that the straw man proposal of Project Lambda, by Mark Reinhold, in 2009, mentions 'Extension methods' as a mandatory feature to be added to support lambdas. Instead, default methods were added to allow more complex interfaces to be used. But given lambdas can only implement a single method they would be limited to interfaces with a single method which would be a pretty severe restriction. One implementation is in C, and the other is in Java. The designers (cleverly, in my view) decided to make lambdas syntax for creating anonymous implementations of an interface. Data Cartridge Developer's Guide Table of Contents Search Download 17 Pipelined Table Functions: Interface Approach Example Two complete implementations of the StockPivot pipelined table function using the interface approach are described. Data Cartridge Developers Guide Table of Contents Search Download 17 Pipelined Table Functions: Interface Approach Example Two complete implementations of the StockPivot pipelined table function using the interface approach are described. Default methods were added to Java 8 primarily to support lambda expressions. In Java, a default method is a method that has a default implementation and can be overridden by a class implementing the interface.
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