Oracle Java Certification Exam OCA 1Z0-808 Preparation 2024

Now is the time to get certified for Java!

Oracle Certification Associate Java OCA 1Z0-808.

There are six Practice Tests with preparation questions from all knowledge areas.

Every question has an explanation and a Try-It-Yourself-Code

which you can run to better understand the topic.

You can download the Try-It-Yourself-Code for all questions.

(The download link will be in your welcome message.)

Exam Syllabus

Java Basics

• Define the scope of variables

• Define the structure of a Java class

• Create executable Java applications with a main method; run a Java program from the command line; produce console output

• Import other Java packages to make them accessible in your code

• Compare and contrast the features and components of Java such as: platform independence, object orientation, encapsulation, etc.
  

Working With Java Data Types

• Declare and initialize variables (including casting of primitive data types)

• Differentiate between object reference variables and primitive variables

• Know how to read or write to object fields

• Explain an Object's Lifecycle (creation, "dereference by reassignment" and garbage collection)

• Develop code that uses wrapper classes such as Boolean, Double, and Integer
  

Using Operators and Decision Constructs

• Use Java operators; use parentheses to override operator precedence

• Test equality between Strings and other objects using == and equals ()

• Create if and if/else and ternary constructs

• Use a switch statement
  

Creating and Using Arrays

• Declare, instantiate, initialize and use a one-dimensional array

• Declare, instantiate, initialize and use multi-dimensional arrays
  

Using Loop Constructs

• Create and use while loops

• Create and use for loops including the enhanced for loop

• Create and use do/while loops

• Compare loop constructs

• Use break and continue
  

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; differentiate between default and user defined constructors

• Apply access modifiers

• Apply encapsulation principles to a class

• Determine the effect upon object references and primitive values when they are passed into methods that change the values
  

Working with Inheritance

• Describe inheritance and its benefits

• Develop code that makes use of polymorphism; develop code that overrides methods; differentiate between the type of a reference and the type of an object

• Determine when casting is necessary

• Use super and this to access objects and constructors

• Use abstract classes and interfaces
  

Handling Exceptions

• Differentiate among checked exceptions, unchecked exceptions, and Errors

• Create a try-catch block and determine how exceptions alter normal program flow

• Describe the advantages of Exception handling

• Create and invoke a method that throws an exception

• Recognize common exception classes (such as NullPointerException, ArithmeticException, ArrayIndexOutOfBoundsException, ClassCastException)
  

Working with Selected classes from the Java API

• Manipulate data using the StringBuilder class and its methods

• Create and manipulate Strings

• Create and manipulate calendar data using classes from java.time.LocalDateTime, java.time.LocalDate, java.time.LocalTime, java.time.format.DateTimeFormatter, java.time.Period

• Declare and use an ArrayList of a given type

• Write a simple Lambda expression that consumes a Lambda Predicate expression

Disclaimer:

The Oracle Java OCA 1Z0-808 exam is very tough!!!

You need to program with Java for a couple of years and/or study for about half a year.

This can not be the only resource to prepare for the Oracle Java OCA exam.

You also need books/ebooks, video tutorials (Udemy, Youtube) and other collections of questions (Enthuware).

I wanted to put in as many question as possible.

Udemy only allows six practice tests.

The result is that each practice test is having about 190 questions.

Therefore you can not really test, how fast you are

but you can download the Java code from the questions and really work with it in your IDE.