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Java Academy · Lesson

Common Pitfalls & Debugging Messages

Recognize common mistakes in if/else code, read compiler/runtime errors, and use print-based debugging effectively.

Why Debugging

Why debugging? Bugs happen. Learn to read messages, locate the cause, and verify the fix. Simple println checks often beat guessing.

Compiler Errors

Common compiler errors

  • cannot find symbol: wrong name or missing import
  • incompatible types: assigning the wrong type
  • missing ;: semicolon/brace issues
  • unclosed string literal: quote mismatch
int x = 5
System.out.println("Hi")

All lessons in this course

  1. If Statements – Basics
  2. If Statements – Practice & Nested
  3. Common Pitfalls & Debugging Messages
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