// Design the code to throw NullPointerException at runtime.

// The code should be compiled successfully as there is no checked exception.

// NullPointerException should be thrown from getAnimalOwner and caught in

// invokeGetAnimalOwner.

public class UncheckedExceptionTest {

private static Person getAnimalOwner(Animal animal) {

try {

return animal.getOwner();

} finally {

System.out.println("getAnimalOwner clean up");

// Don't include 'return' in finally! Otherwise the uncaught execption will be lost!

//return null;

}

}

// Comment the try-catch block out if you want to see the propagation of execption

private static Person invokeGetAnimalOwner(Animal animal) {

try {

Person owner = getAnimalOwner(animal);

System.out.println("This should never be executed!");

return owner;

} catch (Exception e) {

e.printStackTrace();

System.out.println("Caught runtime exception!");

return null;

}

}

private static String testAfterFinally() {

String str = "";

try {

throw new RuntimeException("Throwed an exception inside try!");

} finally {

System.out.println("Statements inside finally");

str = "Finally";

}

/* This part won't be reached! It's a compilation error if you uncomment it.

System.out.println("Statements after finally!");

return str;

*/

}

public static void main(String[] args) {

Animal animal = null;

try {

Person owner = invokeGetAnimalOwner(animal);

} catch (Exception e) {

e.printStackTrace();

System.out.println("This statement should only be executed when " +

"invokeGetAnimalOwner doesn't caught the execption");

}

String testStr = testAfterFinally();

System.out.println("testStr = " + testStr);

}

}