Excepciones comprobadas y no comprobadas

Introducción

Excepciones comprobadas

Código: IOException comprobada

public class Main {
  public static void main(String[] args) {
    try {
      java.io.FileReader fr = new java.io.FileReader("missing.txt"); // checked exception
      fr.read();
      fr.close();
    } catch (java.io.IOException e) {
      System.out.println("Handled IOException: " + e.getMessage());
    }
  }
}

Excepciones no comprobadas

Código: NPE no comprobada

public class Main {
  public static void main(String[] args) {
    String s = null;
    try {
      System.out.println(s.length()); // unchecked exception
    } catch (NullPointerException e) {
      System.out.println("Caught NullPointerException");
    }
  }
}

Código: declaración throws

public class Main {
  static void risky() throws java.io.IOException {
    throw new java.io.IOException("I/O problem");
  }
  public static void main(String[] args) {
    try {
      risky();
    } catch (java.io.IOException e) {
      System.out.println("Handled in main: " + e.getMessage());
    }
  }
}

Comprobación: comprobadas frente a no comprobadas

Repaso