在eclipse中运行示例MySQL代码时出现ClassNotFoundException

I'm trying to compile and run the sample code shown below, but it gives me a ClassNotFoundException. I was wondering what the best way to resolve this issue in eclipse would be, as I'm new to the software. I've read many answers on the site about this exception and what may cause it, but I cannot understand alot of the solutions, so I would greatly appreciate if someone could give me a simple explanation for what's causing the problem. Thank you. I'm trying to compile and run the sample code s