Java · Theory

Exception Handling with Method Overriding

Theory

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Exception Handling with Method Overriding

Exception Handling with Method Overriding sits inside exception handling. try holds risky code. catch runs backup code. finally runs cleanup (close file / connection) whether error happened or not.

throw sends an exception. throws declares a checked exception on the method. Empty catch blocks hide bugs — print or log the message.

Checked exceptions must be handled or declared. Unchecked (RuntimeException family) usually are not declared. Catch specific types first, then broader ones.

Let's take this on the board with one tiny Main class — no extra files. Exception Handling with Method Overriding — output: Cannot divide by zero. 10/0 throws ArithmeticException; catch prints the message. x is never printed. Start from main, go line by line, and stop at each print. That output is the proof for Exception Handling with Method Overriding.

Diagram

try { risky }
        │ throws
        ▼
  catch → message
        │
        ▼
  finally → cleanup

Exam tip

Say checked vs unchecked in one line if asked.

Example

// try-catch demo
public class Main {
  public static void main(String[] args) {
    try {
      int x = 10 / 0;
      System.out.println(x);
    } catch (ArithmeticException e) {
      System.out.println("Cannot divide by zero");
    }
  }
}

Exception Handling with Method Overriding — output: Cannot divide by zero. 10/0 throws ArithmeticException; catch prints the message. x is never printed.

Short notes

Deftry = risky code. catch = backup. finally = cleanup always.
Rulethrow = do it. throws = declare it on the method.
Diffchecked = handle or declare. unchecked = RuntimeException family.
TrapEmpty catch hides the real bug.

// try-catch demo public class Main { public static void main(String[] args) { try { int x = 10 / 0; System.out.println(x); } catch (ArithmeticException e) { System.out.println("Cannot divide by zero"); } } }

Exception Handling with Method Overriding

Example

Short notes

Questions

Exception Handling with Method Overriding

Example

Short notes

Questions