interface A default void m() System.out.print("A"); interface B default void m() System.out.print("B"); class C implements A, B // compile error unless C overrides m()
of common Java 8 "gotchas" used in technical tests Top Java 8 Features With Examples - Cogent Infotech ikm java 8 test verified
The code was sleek, readable, and thread-safe. The nightmare of the legacy Iterator was gone, replaced by the declarative elegance of Streams. interface A default void m() System
: Includes generics, collections, exception handling (specifically try-with-resources ), and standard I/O (NIO.2). Strategic Insights for Success interface A default void m() System.out.print("A")
Before Java 8, interfaces could only have abstract methods. Now, they can contain implementation code. The IKM test often features "diamond problem" scenarios where a class implements two interfaces with the same default method signature. 4. Optional Class