Java Exception Handling
Exception handling in Java is an essential mechanism for managing runtime errors and maintaining the normal flow of an application. Some common examples of exceptions are ClassNotFoundException, IOException, SQLException, RemoteException, and ArithmeticException. By controlling these exceptions, developers can create robust and fault-tolerant applications.
Simple example of ArithmeticException or division by zero
import java.io.*;
class Geeks {
public static void main(String[] args) {
int n = 10;
int m = 0;
int ans = n / m; // causes ArithmeticException
// execution does not reach these lines if the exception is not handled
}
}
Note
When an exception occurs and is not handled, the program terminates abruptly and the code that follows is never executed.
Example with try catch finally handling ArithmeticException
import java.io.*;
class Geeks {
public static void main(String[] args) {
int n = 10;
int m = 0;
try {
int ans = n / m; // may throw ArithmeticException
// the answer would have been printed here if there were no exception
} catch (ArithmeticException e) {
// exception handling: division by zero not allowed
} finally {
// the program continues after handling the exception
}
}
}
Expected output when the exception is handled
Error Division by zero is not allowed!
Program continues after handling the exception.
Exception hierarchy in Java
In Java, all exceptions and errors are subclasses of the Throwable class. From there, two main branches branch out
Exception
Error
Exceptions are problems that the application can attempt to handle, while errors are usually outside the programmer's control and should generally not be caught.
Main reasons why exceptions occur
Invalid user input
Device failure
Network connection loss
Physical limitations such as lack of disk space
Code errors
Out-of-bounds access
Null reference
Type incompatibility
Opening an unavailable file
Database errors
Arithmetic errors
Examples of nested try catch
public class NestedTryExample {
public static void main(String[] args) {
try {
System.out.println(Outer try block);
try {
int a = 10 / 0; // causes ArithmeticException
} catch (ArithmeticException e) {
System.out.println(Inner catch e);
}
String str = null;
System.out.println(str.length()); // causes NullPointerException
} catch (NullPointerException e) {
System.out.println(Outer catch e);
}
}
}
Best practices
Catching specific exceptions instead of intercepting general exceptions allows for more precise management. Using finally blocks or try-with-resources ensures resource cleanup. Log exception information and provide useful messages for debugging without exposing sensitive information.
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