It's working alright here! 
Remember you can always use <CTRL+T> to format/cleanup your source code!
Also, you need to instantiate (create a new object) a class before using it!
Check it out:

class MyOtherClass {

  MyOtherClass(int i) {
    println(i);
  }
}

class MyClass extends MyOtherClass {

  MyClass(int i) {
    super(i);
  }
}

void setup() {
  // Instantiate MyClass:
  new MyClass(10);

  exit();
}