Prevention Strategies
1. Type Checking
graph TD
A[User Input] --> B{Type Validation}
B -->|Valid Type| C[Process Input]
B -->|Invalid Type| D[Reject Input]
Example of Type Validation
public class TypeValidationDemo {
public static boolean isValidInteger(String input) {
try {
Integer.parseInt(input);
return true;
} catch (NumberFormatException e) {
return false;
}
}
public static void main(String[] args) {
String userInput = "123";
if (isValidInteger(userInput)) {
int number = Integer.parseInt(userInput);
System.out.println("Valid integer: " + number);
} else {
System.out.println("Invalid input");
}
}
}
2. Range Validation
Validation Type |
Description |
Example |
Minimum Value |
Check lower bound |
Age > 0 |
Maximum Value |
Check upper bound |
Score âĪ 100 |
Range Constraint |
Check within specific range |
18 âĪ Age âĪ 65 |
Range Validation Example
public class RangeValidationDemo {
public static boolean isValidAge(int age) {
return age >= 18 && age <= 65;
}
public static void main(String[] args) {
int userAge = 30;
if (isValidAge(userAge)) {
System.out.println("Age is valid");
} else {
System.out.println("Invalid age");
}
}
}
3. Regular Expression Validation
public class RegexValidationDemo {
public static boolean isValidEmail(String email) {
String regex = "^[A-Za-z0-9+_.-]+@(.+)$";
return email.matches(regex);
}
public static void main(String[] args) {
String email = "[email protected]";
if (isValidEmail(email)) {
System.out.println("Valid email address");
} else {
System.out.println("Invalid email address");
}
}
}
Best Practices
- Always validate user input
- Use try-catch blocks
- Provide clear error messages
- Implement multiple validation layers
LabEx Recommendation
At LabEx, we recommend implementing comprehensive input validation strategies to enhance application reliability and security. Combining multiple validation techniques provides the most robust protection against input errors.
Comprehensive Validation Strategy
graph TD
A[Input Received] --> B{Type Validation}
B --> |Valid| C{Range Validation}
B --> |Invalid| D[Reject Input]
C --> |Valid| E{Regex Validation}
C --> |Invalid| F[Reject Input]
E --> |Valid| G[Process Input]
E --> |Invalid| H[Reject Input]