Cheatsheets

Quick reference material for Java and software development concepts you use during interview preparation.

Core Java

Use concise references for OOP, collections, exception handling, strings, generics, multithreading, Java 8 features, and modern Java concepts.

Collections

Review the differences between List, Set, Map, HashMap, ConcurrentHashMap, TreeMap, HashSet, and other commonly discussed collection types.

Streams and Functional Programming

Refresh map, filter, flatMap, reduce, groupingBy, Optional, functional interfaces, and common Stream API patterns.

Interview Reminder

Use cheatsheets for revision, but make sure you understand the concepts and can explain them with examples.