[Ben Wolsieffer]

This is how I used interrupt handlers in a gyro driver. The really wierd part about it is that the interruptFired() method is package private, so any class that uses it needs to be in the edu.wpi.first.wpilibj package. I think this was an oversight on the part of the authors of WPILib.

DigitalInput interrupt = new DigitalInput(0);

// Register an interrupt handler
interrupt.requestInterrupts(new InterruptHandlerFunction<Object>() {

     @Override
     public void interruptFired(int interruptAssertedMask, Object param) {
          // Do stuff
     }
});
// Listen for a falling edge
interrupt.setUpSourceEdge(false, true);
// Enable digital interrupt pin
interrupt.enableInterrupts();