Try the following code to see a NullPointerException (if you don’t see the exception because of the autograding, you can copy it into the pencil icon scratch area to run it without the grader). Since s is null, trying to access indexOf on s throws an NullPointerException. Comment out the first if statement and run the program again. The second if statement avoids the error with shortcircuit evaluation. Because s != null is false, the rest of the Boolean expression is not evaluated. Now, change s to set it to "apple" instead of null in the first line and run the code again to see that the if statements can print out that “apple contains an a”. Original - 1 of 1
