Oracle Certified Professional: Java SE Programmer Exam Survival Guide

Window: Global | Core Java fundamentals

Must-do topics

• OOP: classes, objects, inheritance, polymorphism, encapsulation
• Java basics: syntax, data types, operators, control flow
• Collections: List, Set, Map; generics
• Concurrency: threads, synchronization, executors
• Exceptions: checked vs unchecked, try-catch-finally
• Streams, lambdas, functional interfaces
• File I/O, JDBC basics

Top traps (avoid)

• Forgetting difference: == vs equals(), hashCode contract
• Mixing checked vs unchecked exceptions
• Misusing generics (raw types)
• Forgetting default values of uninitialized vars
• Overcomplicating concurrency Qs

Time split

• ~70 Q, 150 min → ~2 min/Q
• Flag long code snippet Qs, return later

Last-48h checklist

• Revise OCA/OCP objectives
• Practice 50 Q timed mock
• Code snippets: loops, inheritance, streams

Quick facts

• String is immutable; StringBuilder is mutable
• Interface vars = public static final by default
• switch supports String, enums, int (Java 7+)
• try-with-resources auto-closes

Speed tactics

• Compile small snippets mentally → track output
• Eliminate answers violating Java syntax rules
• Look for trick Qs with uninitialized vars or hidden exceptions

Day-of mini-plan

• Warm-up: 10 code snippet Qs
• Read Q carefully → focus on what’s being asked (compile/run/output)
• Keep time buffer: 20 min for review