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Java Developers, Stop Making These Mistakes! (And How to Fix Them)🚨

Rasathurai Karan
Javarevisited
Published in
3 min readFeb 14, 2025

Java is a powerhouse in the programming world, but even the best developers can fall into traps that lead to bugs, sluggish performance, and headaches. If you’re ready to level up your Java game, it’s time to tackle these 7 deadly mistakes head-on — and learn how to fix them like a pro! 🚀

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🚨 1. Forgetting to Close Resources (Memory Leaks Alert!)

The Mistake:

Opening resources like database connections, file readers, or network sockets without closing them is like leaving the faucet running — it wastes memory and slows everything down.

🚫 Bad Code:

FileReader fr = new FileReader("file.txt");  
BufferedReader br = new BufferedReader(fr);
String line = br.readLine();

✅ The Fix:
Use try-with-resources to automatically close resources and save yourself the trouble:

try (BufferedReader br = new BufferedReader(new FileReader("file.txt"))) {  
String line = br.readLine();
}

🚨 2. Using == Instead of .equals() for String Comparison

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