Oracle Certified Java Programmer: java 1z0-808

Prepare for the OCA Java SE 8 Programmer I Exam (1Z0-808)

This resource provides a comprehensive overview of the topics covered in the OCA Java SE 8 Programmer I certification exam. Effective September 1, 2022, the exam (exam number 1Z0-808) consists of 56 multiple-choice and multiple-select questions, designed to validate your understanding of Java SE 8 fundamentals. The exam duration is 120 minutes, and a passing score is 65%. This exam has been validated for Java SE 8.

Key Exam Topics:

• Java Basics:

  • Understand variable scope and declaration.
  • Define the structure of a Java class.
  • Create and execute Java applications using the main method and command-line execution.
  • Manage console output effectively.
  • Import and utilize external Java packages.
  • Compare and contrast core Java features like platform independence, object-oriented principles (encapsulation, inheritance, polymorphism), and more.

• Working With Java Data Types:

  • Declare and initialize variables, including primitive data type casting.
  • Distinguish between object reference variables and primitive variables.
  • Understand how to read and write to object fields.
  • Explain the object lifecycle (creation, dereference by reassignment, and garbage collection).
  • Develop code utilizing wrapper classes (Boolean, Double, Integer, etc.).

• Using Operators and Decision Constructs:

  • Master Java operators and operator precedence using parentheses.
  • Compare strings and other objects for equality using == and equals().
  • Implement conditional logic with if, if/else, and ternary operators.
  • Utilize the switch statement for efficient branching.

• Creating and Using Arrays:

  • Declare, instantiate, and initialize one-dimensional arrays.
  • Declare, instantiate, and initialize multi-dimensional arrays.

• Loop Constructs:

  • Create and use while, for (including enhanced for loop), and do/while loops.
  • Compare the strengths and weaknesses of different loop constructs.
  • Utilize break and continue statements for loop control.

• Working with Methods and Encapsulation:

  • Create methods with arguments and return values, including overloaded methods.
  • Apply the static keyword to methods and fields.
  • Create and overload constructors, differentiating between default and user-defined constructors.
  • Apply access modifiers (public, private, protected, default).
  • Implement encapsulation principles to protect class data.
  • Understand the impact of method calls on object references and primitive values.

• Working with Inheritance:

  • Explain the concept of inheritance and its benefits.
  • Develop code leveraging polymorphism and method overriding.
  • Differentiate between the type of a reference and the type of an object.
  • Understand when casting is necessary and how to perform it safely.
  • Utilize super and this keywords to access objects and constructors.
  • Apply abstract classes and interfaces.

• Handling Exceptions:

  • Differentiate between checked exceptions, unchecked exceptions, and Errors.
  • Implement try-catch blocks to handle exceptions gracefully.
  • Understand the advantages of exception handling.
  • Create and invoke methods that throw exceptions.
  • Recognize common exception classes (NullPointerException, ArithmeticException, ArrayIndexOutOfBoundsException, ClassCastException, etc.).

• Working with Selected Classes from the Java API:

  • Manipulate data efficiently using the StringBuilder class.
  • Create and manipulate strings.
  • Create and manipulate calendar data using classes from java.time (LocalDateTime, LocalDate, LocalTime, DateTimeFormatter, Period).
  • Declare and use ArrayList for dynamic data storage.
  • Write simple Lambda expressions to consume Lambda Predicate expressions.

Disclaimer: These questions are designed to help you evaluate your preparation for the certification exam and are not actual examination questions or dumps.