Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Android Build a Simple Android App with Java Basic Android Programming Using the Random Class

Can some one look at the code? I am getting the error Bummer: java.lang.ArrayIndexOutOfBoundsException: -1442945365 ().

String[] facts = { "Ants stretch when they wake up in the morning.", "Ostriches can run faster than horses.", "Olympic gold medals are actually made mostly of silver.", "You are born with 300 bones; by the time you are an adult you will have 206.", "It takes about 8 minutes for light from the Sun to reach Earth.", "Some bamboo plants can grow almost a meter in just one day.", "The state of Florida is bigger than England.", "Some penguins can leap 2-3 meters out of the water.", "On average, it takes 66 days to form a new habit.", "Mammoths still walked the earth when the Great Pyramid was being built.", }; // The button was clicked, update fact TextView // Randomly select a fact

          Random randomGenerator = new Random();
          int randomNumber = randomGenerator.nextInt(facts.length);
          String intAsString = facts[randomNumber];
RandomTest.java
String[] facts = {
                                            "Ants stretch when they wake up in the morning.",
                      "Ostriches can run faster than horses.",
                      "Olympic gold medals are actually made mostly of silver.",
                      "You are born with 300 bones; by the time you are an adult you will have 206.",
                      "It takes about 8 minutes for light from the Sun to reach Earth.",
                      "Some bamboo plants can grow almost a meter in just one day.",
                      "The state of Florida is bigger than England.",
                      "Some penguins can leap 2-3 meters out of the water.",
                      "On average, it takes 66 days to form a new habit.",
                      "Mammoths still walked the earth when the Great Pyramid was being built."
                                    };

Random randomGenerator = new Random();
int randomNumber = randomGenerator.nextInt(facts.length);
String intAsString = facts[randomNumber];

1 Answer

Judah Devasahayam
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
Judah Devasahayam
Full Stack JavaScript Techdegree Graduate 22,609 Points

The reason you're getting an ArrayIndexOutOfBoundsException is because facts.length() is 10 (counted from 1 - 10) whereas an index of an array starts from 0, in your case 9 is the limit. So, this code of yours facts[randomNumber] is basically telling that there are 10 indices in the facts array when there are only 9. This is how your code should look like:

Random randomGenerator = new Random();
int randomNumber = randomGenerator.nextInt(facts.length);
String intAsString = randomNumber + "";