Exceptions Throw करना और Custom Exceptions

public class Main {
  static void checkAge(int age) {
    if (age < 18) {
      throw new IllegalArgumentException("Must be 18 or older");
    }
    System.out.println("Access granted");
  }
  public static void main(String[] args) {
    try {
      checkAge(15);
    } catch (IllegalArgumentException e) {
      System.out.println("Caught: " + e.getMessage());
    }
  }
}

public class Main {
  // Custom checked exception
  static class InvalidAgeException extends Exception {
    InvalidAgeException(String msg) { super(msg); }
  }
  static void validate(int age) throws InvalidAgeException {
    if (age < 18) throw new InvalidAgeException("Too young!");
  }
  public static void main(String[] args) {
    try {
      validate(15);
    } catch (InvalidAgeException e) {
      System.out.println("Caught custom: " + e.getMessage());
    }
  }
}

public class Main {
  // Custom unchecked exception
  static class FatalError extends RuntimeException {
    FatalError(String msg) { super(msg); }
  }
  public static void main(String[] args) {
    try {
      throw new FatalError("Something bad happened");
    } catch (FatalError e) {
      System.out.println("Caught runtime: " + e.getMessage());
    }
  }
}