java8.md

Refactoring to Java 8

• Annonymous classes

  • lambda expressions

• Multi line lambda expressions

  • separate method calls
  • • readability
  • • better exception handling/readability

• Abstract classes

  • interfaces annotated with @FunctionalInterface
  • !Lambda expressions can only be used with interfaces

• Lambda with Supplier<?> supplies the recepy and not the execution

  • lazy evaluation
  • • performance

• For Loop

  • ForEach
  • AnyMatch (does what it says finds an any match according to a given criteria) * ! worse performance than a simple array iteration -> avoid it by any means!
  • FindFirst * orElse() * ! worse performance

• Collections.removeIf => prettier, more readable, same performance!

Sum up

• Follow and obey the stream flow.
• Multiple streams arguably perform better on big collections (>100000 )
• Arrays.stream() is slower then going native, some benefits may present theirselves when going parallel
• !Basic arrays still outperform anything else
• !Debugging still remains a challange