Saving Data Using Java

So I'm still learning how to save data using Java. I know that saving data is extremely important when it comes to creating video games.

What I have here is this simple program.

Java Code:

import java.util.*;
import java.io.*;
import java.lang.*;
public class Character
{
private Formatter x;
private int roomNum;
private boolean[] visited = new boolean[10];

[Code]...

I'm trying to make sure that after I exit the program, joe starts in room 4, not room 1, and that he has visited rooms 1, 2, 3, 4, and 10. I have the save data created, but how do I save an array of boolean values?