Question

I'm getting a nullpointer exception at line 33.

Answer 1

getContentPane().setLayout(null);

This looks wrong. A setLayout() function ususally wants a type of layout as an argument, and I wouldn't be surprised if passing it null is causing the exception.

Answer 2

You initialize speed:
```
JSlider speed; //Speed of ball
```
So at this point it is null. Later on you call:
```
speed.setBounds(1, 1, 50, 50);
```
You are calling a method for a null value, which isn't possible. You need speed to be initialized. For example you would need something along the lines of `speed = new JSlider()` to ensure that it's a non-null object. Then you can call methods on it.