Oracle Java SE 21 Developer Professional: 1Z0-830



Preparation for Oracle Certification (Java Certification) Java SE 21 1Z0-830 with examples, quizes and home tasks


What you will learn

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Master handling primitives, wrapper classes, and type conversions in Java

Evaluate and apply arithmetic and boolean expressions with precedence rules

Effectively manipulate text using String, StringBuilder, and text blocks

Work with Java Date-Time API to handle date, time, period, and timezone objects

Create and manage control flow constructs like if/else, switch, and loops

Implement advanced object-oriented concepts, including encapsulation and inheritance

Create classes, records, and instantiate fields, methods, and constructors

Apply polymorphism, method overriding, and the instanceof operator with pattern matching

Work with Java interfaces, functional methods, and enums effectively

Handle exceptions using try/catch/finally, try-with-resources, and multi-catch blocks

Create and manipulate arrays and Java Collections like List, Set, Map, and Deque

Process data using Streams and lambda expressions for filtering, transforming, and sorting

Perform advanced operations on Streams like decomposition, reduction, and grouping

Understand modular Java, compile code, and create modular/non-modular JARs

Manage concurrent code execution with threads, ExecutorService, and parallel streams

Develop thread-safe code with locking mechanisms and concurrent APIs

Use Java I/O API for reading/writing files and serializing/deserializing objects

Implement localization using resource bundles and locale-specific parsing/formatting

Understand additional Java features, including annotations and the Java Logging API

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