Oracle Java Certification in Nagpur Prepare for Java SE 25, Oracle’s newest Java exam.

• Primitive types, wrapper classes and autoboxing
• Operators and precedence, casting and type conversion, and the Math API
• String and StringBuilder, and text blocks Java 15
• The Date-Time API: dates, times, durations, periods, instants and time zones, including daylight saving time

• if/else and the conditional operator
• switch statements, and switch expressions with yield Java 14
• Pattern matching in switch Java 21
• for, enhanced for, while and do/while loops
• break and continue, including labels

• Classes and objects, nested and inner classes, and the object life cycle and garbage collection
• Fields, methods, constructors and initializers, including flexible constructor bodies Java 25
• Records Java 16, enums with fields, methods and constructors, and immutable objects
• Overloading and var-args, scope and encapsulation, var Java 10 and unnamed variables Java 22
• Inheritance, abstract classes, and sealed classes and interfaces Java 17
• Overriding, including the methods of Object; polymorphism, object type versus reference type, and instanceof patterns Java 16
• Interfaces with default, static and private methods, and functional interfaces

Flexible constructor bodies are new in Java 25: a constructor can run statements before it calls super(…) or this(…).

• try, catch and finally
• Multi-catch, and try-with-resources
• Checked and unchecked exceptions, and the exception hierarchy
• Writing your own exceptions

• Arrays: declaring, initialising, copying and sorting
• List, Set, Map and Deque, and the classes that implement them
• Sequenced collections Java 21: first and last elements, and reversed views
• Sorting with Comparable and Comparator
• Generics in collection code

• Lambda expressions, method references and the java.util.function interfaces
• Object and primitive streams: creating, filtering, transforming and sorting data
• Reduction, concatenation, grouping and partitioning
• Stream gatherers Java 24: your own intermediate operations
• Optional, and sequential versus parallel streams

• Modules: module-info.java, exports and requires, services with providers and consumers, and access by reflection
• Module import declarations Java 25
• Compact source files and instance main methods Java 25, and launching multi-file source-code programs Java 22
• Modular and non-modular JARs, and custom runtime images with jlink
• Migrating to modules with unnamed and automatic modules

Compact source files let a first program be just void main() { … }, with no class declared around it.

• Platform threads and virtual threads Java 21
• Runnable and Callable, and the thread life cycle
• Executor services and the concurrency API
• Thread-safe code: locks, atomic variables and concurrent collections
• Scoped values Java 25 for sharing immutable context
• Processing collections concurrently, and parallel streams

• Reading and writing console and file data with I/O streams
• Serializing and deserializing objects
• NIO.2: Path objects and the Files class, walking directories, and file attributes

• Locales and resource bundles
• Formatting and parsing messages, dates, times and numbers, including currency and percentages