This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
You obviously know how to create arrays, so what problem are you having ?
Having said that though, rather than having four arrays to handle the different elements of a cache entry, you should create a new class called CacheEntry which contains fields to represent each of the elements. Your Cache class will then contain a one dimensional array of CacheEntry objects.
Have a go at implementing that and if you have any problems, come back with your code and we'll try and help.