Overview

Java SE Programmer II exam (1Z0-809) Mock Exams are designed to test your knowledge to pass the official Oracle Certified Professional: Java SE Programmer II exam (1Z0-809) Certification exam. Java is one of the predecessor in IT world. Top class companies in the world utilizing Java to build their enterprise application. So, a lot of job openings are opened in the market for Java professional. Being a certified Java professional is an extra bonus to your careerJava SE Programmer II exam (1Z0-809) is a 68- item exam, with a passing score of 65%. Candidates are given 120 minutes to complete the exam, which includes adequate time to complete the exam for non-native English speakersExam Pattern- Number of Questions: 68- Passing score: 65%- Duration: 120 Minutes- Questions Type: Multiple Choice, Multiple Selection, MatchingJava SE Programmer II exam (1Z0-809) Mock Exams avails you to test your haste and precision to pass official Oracle Certified Professional: Java SE Programmer II exam (1Z0-809) Certification. After you finish the mock exams, you can utilize the explanation section to expand your knowledgeExam Syllabus1. Java Language Fundamentals (18%)Java Classes and ObjectsUnderstanding the structure of a Java class (methods, constructors, variables, etc.)Declaring and using variables (primitive, object references)Creating and using arrays (single and multidimensional)Control Flow StatementsUsing if-else, switch, and ternary operator.Looping with for, while, and do-while loops.Using break and continue in loops.2. Object-Oriented Programming (OOP) (18%)Working with ObjectsCreating and instantiating objects and classes.Using constructors for initialization and chaining constructors.InheritanceUnderstanding inheritance and subclassing in Java.Overriding methods and the super keyword.Inheritance of fields and methods.PolymorphismMethod Overloading and Method Overriding.Dynamic method dispatch and late binding.AbstractionUsing abstract classes and methods.Using interfaces and defining default methods.EncapsulationAccess modifiers (private, public, protected).Creating getters and setters for encapsulation.3. Core Java APIs (24%)Java Collections FrameworkUnderstanding and working with Collection interfaces: List, Set, Queue, and Map.Implementations of Collection classes: ArrayList, HashSet, HashMap, LinkedList.Collection utilities and iterators.Sorting and searching using the Comparator and Comparable interfaces.GenericsWorking with generic types in methods, classes, and interfaces.Using wildcards (?), bounded wildcards, and generic methods.Understanding type erasure and its effects.String HandlingWorking with the String, StringBuilder, and StringBuffer classes.String manipulation (concatenation, substring, etc.).String formatting using String.format() and printf().Date and Time API (java.time)Understanding LocalDate, LocalTime, LocalDateTime, ZonedDateTime.Performing date-time arithmetic (e.g., adding, subtracting days).Using Duration and Period to represent time intervals.4. Lambda Expressions and Functional Programming (12%)Lambda SyntaxUnderstanding the basic syntax of lambda expressions.Using functional interfaces such as Predicate, Consumer, Function, and Supplier.Using Streams APIUsing streams for aggregation operations (map, filter, reduce, etc.).Understanding Collectors, GroupBy, and Collectors.toList().Method ReferencesUsing method references to replace lambda expressions for cleaner code.Working with OptionalUsing Optional to prevent NullPointerException.Operations such as ifPresent(), orElse(), orElseGet(), map(), and flatMap().5. Exception Handling (12%)Try-Catch BlocksUnderstanding try-catch and multi-catch for handling exceptions.Handling specific exceptions and handling multiple exceptions.Throwing ExceptionsThrowing exceptions using the throw keyword.Using throws to declare exceptions in methods.Custom ExceptionsCreating custom exceptions by extending Exception or RuntimeException.Throwing and catching custom exceptions.Checked vs. Unchecked ExceptionsUnderstanding the distinction and when to use each type.6. Java I/O (10%)Reading and Writing FilesUsing FileReader, BufferedReader, FileWriter, and BufferedWriter for file I/O.Handling file paths and directories with Path, Files, and Paths classes.SerializationUsing Serializable to serialize objects.Reading and writing serialized objects with ObjectInputStream and ObjectOutputStream.NIO (New I/O)Using NIO features like Path, File, Files, BufferedReader, BufferedWriter for better file manipulation.Stream I/OWorking with InputStream, OutputStream, Reader, and Writer for basic data I/O.7. Concurrency (10%)Threads and Runnable InterfaceCreating and running threads using Thread class and Runnable interface.Thread SynchronizationSynchronizing methods and blocks using synchronized keyword.Dealing with thread safety and common concurrency issues.Executor FrameworkUsing ExecutorService for managing threads.Submitting tasks using submit() and invokeAll().Concurrency UtilitiesUsing classes from java.util.concurrent (e.g., CountDownLatch, Semaphore, CyclicBarrier, etc.).Callable and FutureUsing Callable for tasks that return results and Future to handle the task results.8. JVM Internals and Performance (6%)Java Memory ModelUnderstanding the heap, stack, and method areas in the JVM memory structure.Memory allocation, object creation, and garbage collection basics.Garbage CollectionBasics of garbage collection (GC) and understanding GC algorithms.Configuring JVM to optimize memory usage and GC performance.JVM PerformanceMonitoring and tuning the JVM for better performance (memory management, CPU usage).9. Miscellaneous (10%)Java 8 FeaturesUnderstanding Java 8's new features such as default methods in interfaces, static methods in interfaces, and the Optional class.AnnotationsUsing built-in annotations (@Override, @SuppressWarnings, etc.) and creating custom annotations.Reflection APIUsing the reflection API to inspect and manipulate classes and objects at runtime.Basic Unit Testing with JUnitWriting unit tests using JUnit for testing Java applications.Exam Preparation Tips:Study the Exam Objectives: Focus on understanding the key topics in depth, with an emphasis on practical application.Hands-on Coding: Write code to reinforce theoretical concepts.Mock Exams: Take practice tests to get familiar with the question format and improve time management during the actual exam.Use Official Study Materials: Oracle's official study guides and courses are highly recommended for preparation.If the sample code doesn't contain any packages or import statements and the question doesn't explicitly mention those missing statements, assume that all the sample code is within the same package or there are import statements that support them.

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