1Z0-084

The Oracle 1Z0-084 exam, "Java SE 8 Programmer I," covers the fundamentals of Java programming using Java SE 8. The main points revolve around these key areas:

• Java Fundamentals: This is the bedrock of the exam. You need a strong understanding of:

  • Data Types: Primitive data types (int, float, boolean, etc.), wrapper classes, and their usage.
  • Operators: Arithmetic, logical, bitwise, and assignment operators, and operator precedence.
  • Control Flow Statements: if-else , switch , for , while , do-while loops, and their efficient use.
  • Object-Oriented Programming (OOP) Concepts: Classes, objects, inheritance, polymorphism, encapsulation, and abstraction. You'll need to be able to design and implement classes effectively. Understanding interfaces and abstract classes is crucial.
  • Exception Handling: try-catch-finally blocks, checked and unchecked exceptions, custom exception handling.
  • Arrays and Collections: Working with arrays, ArrayLists, LinkedLists, HashMaps, HashSets, and other core collection classes. Understanding their characteristics and when to use each is key. This includes iterating through collections efficiently.

• Lambda Expressions and Streams (Java 8 Features): A significant portion of the exam focuses on the new features introduced in Java 8. Specifically:

  • Lambda Expressions: Creating and using lambda expressions for concise code. Understanding functional interfaces is essential.
  • Streams: Processing collections using streams for efficient and parallel operations (e.g., filtering, mapping, reducing). This involves understanding stream operations, terminal operations, and intermediate operations.

• Java I/O: Basic file handling using input and output streams. Understanding how to read from and write to files is necessary.

• Generics: Using generics to write type-safe code. You should understand how to define and use generic classes and methods.

• Method Overloading and Overriding: Understanding the differences and how they work within the context of inheritance and polymorphism.

In summary: The exam tests your ability to write, compile, debug, and understand fundamental Java code, with a specific emphasis on the features introduced in Java 8 (lambdas and streams). It's not about complex algorithms or large-scale application design; rather, it's about demonstrating a solid grasp of core Java concepts and their practical application. Focus on hands-on practice and coding exercises to master these areas.