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Important Topics for Java Technical Interview

Problem Solving Skill
  • Ask more clarifying question and be receptive to hints provided by the interviewers. 
  • Articulate and express thoughts clearly & crisp. 
  • Make the interviewing experience more interactive.
  • Should be able to deal with ambiguity
Java Programming Language
  • you should be able to write syntactically correct Java code with pen and paper.
  • Familiarize yourself with key concepts like memory management, collections other key libraries.
Coding
- the code you write should be
  1. Logical
  2. Syntax - syntactically correct
  3. Modular & Maintainable - 
    1. function declarations 
    2. function returns
    3. initialization
    4. scope of variables
    5.  recursion
  4. Executable
  5. Testable - very well tested and should have checks 
    1. provide checks to prevent bad input
    2. validate corner/edges cases.
    3. validate null cases
    4. should take care of happy cases
  6. Optimized
    1. pointer manipulation
    2. Space and Time complexity
Data Structures
- Get thorough understanding of Data Structures -
  1. Trees, 
  2. Binary Trees, 
  3. Hash map, 
  4. Set, 
  5. Hash tables, 
  6. Arrays, 
  7. Queues, 
  8. Stacks, 
  9. Linked Lists, 
  10. Tree Traversals 
  11. BFS and DFS.

- Use Google & Wikipedia for brushing up on data structures.

References:

Algorithms
- Traversals, divide and conquer. breadth first search, and depth first search.
- Sorting
- Merging
- Search Algorithms

Object Oriented Design
extensible, long lived code, bug free.
OOPS
  1. Overloading vs. Overriding.
  2. Encapsulation and inheritance.
  3. Inheritance and polymorphism
  4. HLD (Component wise segregation)
  5. LLD (Class & sequence diagram)
  6. Design patterns. Design tool if you’ve worked on any.

Low Level & High Level Design
- Design patterns

Databases
- relational and non-relational databases

Distributed Computing
- scaling
- distributed computing concepts
- service oriented architecture
- map-reduce
- distributed caching
- load balancing

Operating Systems
- memory management
- processes,
- threads / multi-threading
- synchronization,
- paging


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