OCPJP 8 Upgrade from Java 7 Topics

Lambda Expressions

• Describe and develop code that uses Java inner classes, including nested class, static class, local class, and anonymous classes
• Articles: Inner Class
• Quizzes: Inner Class Quiz
• Describe and write functional interfaces
• Articles: Functional Interface
• Quizzes: Functional Interface Quiz
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• Describe a lambda expression; refactor the code that uses an anonymous inner class to use a lambda expression; describe type inference and target typing
• Articles: Lambda Expression
• Quizzes: Lambda Expression Quiz

Using Built-in Lambda Types

• Describe the interfaces of the java.util.function package
• Articles: java.util.function Package
• Quizzes: java.util.function Package Quiz
• Develop code that uses the Function interface
• Articles: Function Interface
• Quizzes: Function Interface Quiz
• Develop code that uses the Consumer interface
• Articles: Consumer Interface
• Quizzes: Consumer Interface Quiz
• Develop code that uses the Supplier interface
• Articles: Supplier Interface
• Quizzes: Supplier Interface Quiz
• Develop code that uses the UnaryOperator interface
• Articles: UnaryOperator Interface
• Quizzes: UnaryOperator Interface Quiz
• Develop code that uses the Predicate interface
• Articles: Predicate Interface
• Quizzes: Predicate Interface Quiz
• Develop code that uses the primitive and binary variations of the base interfaces of the java.util.function package
• Articles: java.util.function Package
• Quizzes: java.util.function Package Quiz
• Develop code that uses a method reference, including refactoring a lambda expression to a method reference
• Articles: Method References
• Quizzes: Method References Quiz

Java Collections and Streams with Lambdas

• Develop code that iterates a collection by using the forEach() method and method chaining
• Describe the Stream interface and pipelines
• Filter a collection by using lambda expressions
• Identify the operations, on stream, that are lazy

Collection Operations with Lambda

• Develop code to extract data from an object by using the map() method
• Search for data by using methods such as findFirst(), findAny(), anyMatch(), allMatch(), and noneMatch()
• Describe the unique characteristics of the Optional class
• Perform calculations by using Java Stream methods, such as count(), max(), min(), average(), and sum()
• Sort a collection by using lambda expressions
• Develop code that uses the Stream.collect() method and Collectors class methods, such as averagingDouble(), groupingBy(), joining(), and partitioningBy()

Parallel Streams

• Develop code that uses parallel streams
• Implement decomposition and reduction in streams

Lambda Cookbook

• Develop code that uses Java SE 8 collection improvements, including Collection.removeIf(), List.replaceAll(), Map.computeIfAbsent(), and Map.computeIfPresent() methods
• Develop code that uses Java SE 8 I/O improvements, including Files.find(), Files.walk(), and lines() methods
• Use flatMap() methods in the Stream API
• Develop code that creates a stream by using the Arrays.stream() and IntStream.range() methods

Method Enhancements

• Add static methods to interfaces
• Define and use a default method of an interface and describe the inheritance rules for the default method

Use Java SE 8 Date/Time API

• Create and manage date- and time-based events, including a combination of date and time in a single object, by using LocalDate, LocalTime, LocalDateTime, Instant, Period, and Duration
• Work with dates and times across time zones and manage changes resulting from daylight savings, including Format date and times values
• Define, create, and manage date- and time-based events using Instant, Period, Duration, and TemporalUnit