Java for Interview Preparation

Master essential Java concepts and features critical for technical interviews. Understanding these core principles will help you solve problems efficiently and write clean, maintainable code.

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Core Java Fundamentals

Master the basics of Java syntax, data types, and control structures.

Key Topics:

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Object-Oriented Programming

Understanding classes, objects, inheritance, polymorphism, and encapsulation.

Key Topics:

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Collections Framework

Work with Java's powerful collection interfaces and implementations.

Key Topics:

  • •List
  • •Set
  • •Map
  • •Queue
  • •Iterators
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Exception Handling

Handle errors gracefully with try-catch blocks and custom exceptions.

Key Topics:

  • •Try-Catch
  • •Throw & Throws
  • •Custom Exceptions
  • •Finally Block
  • •Exception Hierarchy
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Strings & StringBuilder

Master string manipulation, immutability, and performance optimization.

Key Topics:

  • •String Methods
  • •Immutability
  • •StringBuilder
  • •StringBuffer
  • •String Pool
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Generics

Write type-safe and reusable code with generic classes and methods.

Key Topics:

  • •Generic Classes
  • •Generic Methods
  • •Bounded Types
  • •Wildcards
  • •Type Erasure
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Multithreading & Concurrency

Create and manage threads for concurrent program execution.

Key Topics:

  • •Thread Creation
  • •Synchronization
  • •Locks
  • •Executors
  • •Concurrent Collections
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Java 8+ Features

Leverage modern Java features like streams, lambdas, and functional interfaces.

Key Topics:

  • •Lambda Expressions
  • •Streams API
  • •Optional
  • •Method References
  • •Functional Interfaces
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JVM & Memory Management

Understand how Java manages memory and the JVM architecture.

Key Topics:

  • •Heap vs Stack
  • •Garbage Collection
  • •JVM Architecture
  • •Memory Leaks
  • •Class Loading
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Input/Output (I/O)

Read from and write to files, streams, and network connections.

Key Topics:

  • •File I/O
  • •Streams
  • •Readers & Writers
  • •Serialization
  • •NIO
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Design Patterns in Java

Implement common design patterns using Java best practices.

Key Topics:

  • •Singleton
  • •Factory
  • •Builder
  • •Observer
  • •Strategy
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Common Interview Topics

Frequently asked Java concepts in technical interviews.

Key Topics:

  • •equals() & hashCode()
  • •Comparator vs Comparable
  • •Abstract vs Interface
  • •Final Keyword
  • •Static Keyword