When it's time to hang Christmas lights, you may notice a few dead bulbs. Repairing these lights won't be easy, but with a little determination and know-how, it can be done.

Here are a few to try. Find the bad bulb If you plug in a string of lights and nothing turns on, Scalisi says that it might be caused by one—yes, one —burnt-out bulb.

This process lets you build a string until you need to display it to the user or store it for future use. You must first create a variable for the string, then build the string in the Java code.