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Oracle Certified Professional: Java SE 21 Developer (1Z0-830) Syllabus

Handling Date, Time, Text, Numeric and Boolean Values

Working with primitives, wrappers, Math, text and the Date-Time API.

10%

Weight

Questions

Marks

Primitives and Expressions

Primitives and wrapper classes
Operator precedence and evaluation
Type conversion and casting
Math API

Text and Date-Time

String and StringBuilder methods
Text blocks
LocalDate, LocalDateTime, ZonedDateTime and Instant
Duration, Period and daylight saving time

Controlling Program Flow

Building decision and loop logic, including switch expressions.

10%

Weight

Questions

Marks

Decisions

if/else statements
switch statements
switch expressions and yield
Pattern matching in switch

Loops

for, enhanced for, while and do/while
break and continue
Labeled statements
Loop variable scope

Using Object-Oriented Concepts in Java

Designing classes, records, interfaces, enums and inheritance hierarchies.

10%

Weight

Questions

Marks

Classes and Objects

Object lifecycle and garbage collection
Fields, constructors and initializers
Nested classes
Overloading and varargs

Encapsulation and Records

Variable scope and encapsulation
Immutable objects
Records
Local variable type inference with var

Inheritance and Polymorphism

Abstract and sealed classes
Overriding including Object methods
Casting and instanceof pattern matching
Interfaces with default, static and private methods
Enums with fields and constructors

Handling Exceptions

Handling and declaring exceptions, including resources and custom exceptions.

10%

Weight

Questions

Marks

Exception Basics

Checked vs. unchecked exceptions
try/catch/finally flow
Multi-catch
Exception hierarchy

Advanced Handling

try-with-resources and AutoCloseable
Suppressed exceptions
Custom exception classes
Overriding and throws clauses

Working with Arrays and Collections

Creating and manipulating arrays and core collections.

10%

Weight

Questions

Marks

Arrays

Declaring and initializing arrays
Multidimensional arrays
Arrays utility methods
Sorting and searching

Collections and Generics

List, Set, Map and Deque
Sequenced collections
Comparable and Comparator
Generics and wildcards

Working with Streams and Lambda Expressions

Processing data with streams and lambdas.

10%

Weight

Questions

Marks

Lambdas and Functional Interfaces

Lambda syntax
Built-in functional interfaces
Method references
Primitive functional interfaces

Stream Operations

Creating object and primitive streams
Filter, map and sort
Reduction and Collectors
Grouping and partitioning
Sequential vs. parallel streams

Packaging and Deploying Java Code

Defining modules and packaging modular and non-modular applications.

10%

Weight

Questions

Marks

Java Platform Module System

module-info.java directives
exports, requires and opens
Services, providers and consumers
Reflection access to modules

Building and Migrating

Compiling and running modular code
Modular and non-modular JARs
Runtime images with jlink
Unnamed and automatic modules

Managing Concurrent Code Execution

Creating threads and writing thread-safe concurrent code.

10%

Weight

Questions

Marks

Threads

Platform and virtual threads
Runnable and Callable
Thread lifecycle
ExecutorService and Future

Thread Safety

synchronized and locks
Atomic classes
Concurrent collections
Parallel streams and concurrency issues

Using Java I/O API

Reading and writing data with I/O streams and NIO.2.

10%

Weight

Questions

Marks

I/O Streams

Console input and output
Byte and character streams
Buffered readers and writers
Serialization and deserialization

NIO.2 Files and Paths

Path creation and resolution
Files class read and write methods
Traversing directories
File attributes

Implementing Localization

Localizing applications with locales, resource bundles and formatters.

10%

Weight

Questions

Marks

Locales and Resource Bundles

Locale class
Resource bundle lookup order
Properties-based bundles
Default locale categories

Formatting

NumberFormat including currency and percent
Compact number formatting
Date and time formatting
MessageFormat

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Smart Flash Cards

AI-generated flash cards that adapt to your learning progress

Spaced repetition system
Progress tracking

Timed Exams

Simulate real exam conditions with timed practice tests

Exam-like environment
Time management skills

Practice Tests

Comprehensive question bank with detailed explanations

Latest exam patterns
Detailed solutions

Mind Maps

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Interactive diagrams
Topic relationships

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Topic-wise performance analysis
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Learning Progress

Handling Date, Time, Text, Numeric and Boolean Values 85%

Controlling Program Flow 92%

Practice Test Scores

95%

Latest Score

Above passing threshold

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