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12 Topics to Crack Java SE 21 Certification 1Z0–830 Exam in 2025?

Published at

12/29/2024

12 Topics to Master for 1Z0–830 (Java SE 21 Certification)

Here are the key topics for Java SE 21 Certification (1Z0--830):

1. Handling Date, Time, Text, Numeric, and Boolean Values

Use primitives and wrapper classes to evaluate arithmetic and boolean expressions.
Apply Math API functions, precedence rules, type conversions, and casting.
Manipulate text using String and StringBuilder classes, including text blocks.
Work with date, time, duration, period, instant, and time-zone objects, considering daylight saving time, using the Date-Time API.

2. Controlling Program Flow

Implement program flow control constructs:
if/else
switch statements and expressions
Loops (for, while, do-while)
Break and continue statements.

3. Using Object-Oriented Concepts in Java

Classes and Objects:
Declare and instantiate Java objects, including nested classes.
Explain the object life-cycle: creation, reassigning references, and garbage collection.
Class Features:
Define and use instance and static fields, methods, constructors, and initializers.
Implement overloaded methods, including var-arg methods.
Encapsulation and Immutability:
Understand variable scopes.
Apply encapsulation and create immutable objects.
Use local variable type inference.
Inheritance and Polymorphism:
Implement inheritance with abstract, sealed, and record classes.
Override methods, including Object class methods.
Understand polymorphism and differentiate between object and reference types.
Use reference type casting, instanceof operator, and pattern matching.
Interfaces:
Create and use interfaces, including functional interfaces.
Utilize private, static, and default interface methods.
Enums:
Define and use enum types with fields, methods, and constructors.

4. Handling Exceptions

Handle exceptions using:
try/catch/finally blocks.
try-with-resources.
Multi-catch blocks.
Create and manage custom exceptions.

5. Working with Arrays and Collections

Create and manage arrays and collections (List, Set, Map, Deque).
Add, remove, update, retrieve, and sort collection elements.

6. Working with Streams and Lambda Expressions

Use Java object and primitive streams to:
Create, filter, transform, process, and sort data.
Perform operations like decomposition, concatenation, reduction, grouping, and partitioning on sequential and parallel streams.
Implement lambda expressions with functional interfaces.

7. Packaging and Deploying Java Code

Define modules, expose module content (including via reflection), and declare dependencies.
Create modular and non-modular JARs, runtime images, and migrate to modules using unnamed and automatic modules.
Define services, providers, and consumers.

8. Managing Concurrent Code Execution

Create platform and virtual threads.
Use Runnable and Callable objects, manage thread lifecycles, and utilize Executor services.
Develop thread-safe code using locking mechanisms and concurrent APIs.
Process Java collections concurrently and utilize parallel streams.

9. Using Java I/O API

Read and write data using console and file I/O streams.
Serialize and deserialize Java objects.
Manage paths and file properties using the java.nio.file API.

10. Implementing Localization

Use locales and resource bundles for localization.
Parse and format messages, dates, times, numbers, currency, and percentage values.

11. Understanding Java Code Environment Assumptions

Recognize missing package and import statements.
Assume file and directory structures for correct code execution.
Handle unintended line breaks in code fragments.
Trust descriptive comments and assume necessary supporting code exists.

12. Additional Expected Knowledge

Understand the basics of Java Logging API.
Use annotations:
@Override
@FunctionalInterface
@Deprecated
@SuppressWarnings
@SafeVarargs
Work with generics, including wildcards.

This structured breakdown provides a clear and detailed path for mastering the required topics for the 1Z0--830 certification and if you want to practice you can also check my course 1Z0-830 Practice Test

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