Java Best Practices
Writing good Java code goes beyond making it compile — it means writing readable, maintainable, and efficient code following established conventions used across the industry and expected in interviews.
Good habits include meaningful naming, proper use of access modifiers, avoiding code duplication, and following the SOLID principles of OOP design as your programs grow.
// Good habits, not new syntaxCode style and structure
Follow Java naming conventions (PascalCase classes, camelCase methods/variables), keep methods short and focused, and favor composition and interfaces over deep inheritance chains.
Robustness and safety
Encapsulate fields as private with getters/setters, handle exceptions meaningfully instead of swallowing them, close resources with try-with-resources, and write unit tests for critical logic.
public class BankAccount {
private double balance;
public void deposit(double amount) {
if (amount > 0) balance += amount;
}
public double getBalance() {
return balance;
}
}
public class Main {
public static void main(String[] args) {
BankAccount acc = new BankAccount();
acc.deposit(100);
System.out.println(acc.getBalance());
}
}100.0balance is private and validated in deposit(), demonstrating encapsulation and input validation.
Key points
- Encapsulate fields as private, expose behavior via methods.
- Follow Java naming conventions consistently.
- Avoid catching and ignoring exceptions silently.
- Use try-with-resources to safely manage resources like files.