インターフェースがdefaultメソッドを持てるようになったことにより，Java 8のCollection APIには多数のメソッドが新たに追加されている。

End your tour of Java's essential language features with Java 8's method references, interface default and static methods, and three lesser known language updates, then preview new features coming ...

You’ll also learn how the interface has evolved in Java 8, with the addition of default and static methods, and in Java 9 with the new private methods.

TLS 1.2をデフォルトで使用する動きはこの1、2年で活発になってきており、Java 8でのデフォルト有効化もこうした流れのひとつといえる。

A public method should never be called by another public method within the same class hierarchy. It should only be called by other classes via the classes' public interface. Class calls might not be ...