Summary: Ocp: Oracle Certified Professional Java Se 8 Programmer Ii Study Guide Exam 1Z0-809 | 9781119067900 | Jeanne Boyarsky, et al

Read the summary and the most important questions on OCP: Oracle Certified Professional Java SE 8 Programmer II Study Guide Exam 1Z0-809 | 9781119067900 | Jeanne Boyarsky; Scott Selikoff

• 3 Generics and Collections

• 3.1.1 Array and ArrayList

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• Why is a List returned by Arrays.asList() not resizable?

  Because it is backed by the underlying array

• 3.2.1 Generic Classes

• What are the common letters used as type parameters in generics?

  • E for an element
  • K for a map key
  • V for a map value
  • N for a number
  • T for a generic data type, and
  • S, U, V, and so forth for multiple generic types
    

• What is the name of the process of removing the generics syntax from your code (at compile time)?

  Type erasure

• 3.2.2 Generic Interfaces

• What are the things you cannot do with generics (mostly due to type erasure)?

  • Call the constructore new T()
  • Create an array of that static type
  • Call instanceof
  • Use a primitive type as a generic type parameter
  • Create a static variable as a generic type parameter
    

• 3.2.5 Bounds

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• What are the three ways you can use generic wildcards?

  • Unbounded wildcard
    ?
    List<?> l = new ArrayList<String>();
  • Wildcard with an upper bound
    ? Extends type
    List<? Extends Exception> l = new ArrayList<RuntimeException>();
  • Wildcard with a lower bound
    ? Super type
    List<? Super Exception> l = new ArrayList<Object>();
    

• 3.3 Using Lists, Sets, Maps, Queues

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• Which four main interfaces are there in the Java Collections Framework?

  • List
  • Set
  • Queue
  • Map
    

• 3.6.1 Using Methods References

• Name the four formats for method references

  • Static methods
  • Instance methods on a particular instance
  • Instance methods on an instance to be determined at runtime
  • Constructors
    

• 4 Functional Programming

• 4.1 Using Variables in Lambdas

• Which variables are accessable for lambda expressions?

  • Static variables
  • instance variables
  • effectively final method parameters
  • effectively final local variables
    

• 4.4 Using Streams

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• Which three parts are there to a stream pipeline?

  1. Source
  2. Intermediate operations
  3. Terminal operations
     

• 4.5.1 Creating Primitive Streams

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• Name the three types of primitive streams

  • IntStream
    int, short, byte and char
  • LongStream
    long
  • DoubleStream
    double and float