import java.util.Vector;

public class Verifier
{
    private static final String EXAMPLE1_FILE = "example1.txt";
    private static final int EXAMPLE1_STEPS = 8;
    private static final String EXAMPLE2_FILE = "example2.txt";
    private static final int EXAMPLE2_STEPS = 86;
    private static final String EXAMPLE3_FILE = "example3.txt";
    private static final int EXAMPLE3_STEPS = 132;
    private static final String EXAMPLE4_FILE = "example4.txt";
    private static final int EXAMPLE4_STEPS = 136;
    private static final String EXAMPLE5_FILE = "example5.txt";
    private static final int EXAMPLE5_STEPS = 81;

    public Verifier (boolean debug)
    {
        _debug = debug;
    }

    public boolean verify ()
    {
        Vector<String> input = Util.readMap(EXAMPLE1_FILE);
        Map theMap = new Map(input, _debug);

        System.out.println(theMap);

        Explorer exp = new Explorer(theMap, _debug);

        System.out.println("Number of keys and doors: "+theMap.numberOfKeys()+", "+theMap.numberOfDoors());

        System.out.println("\nTraversing map ...");
        
        int steps = exp.findAllKeys();

        if (steps != EXAMPLE1_STEPS)
        {
            System.out.println("Error for "+EXAMPLE1_FILE+" - number of steps: "+steps);

            return false;
        }

        System.out.println("Verified. Number of steps to find all keys: "+steps);

        input = Util.readMap(EXAMPLE2_FILE);

        theMap = new Map(input, _debug);

        System.out.println("\n"+theMap);

        exp = new Explorer(theMap, _debug);

        System.out.println("Number of keys and doors: "+theMap.numberOfKeys()+", "+theMap.numberOfDoors());

        System.out.println("\nTraversing map ...");

        steps = exp.findAllKeys();

        if (steps != EXAMPLE2_STEPS)
        {
            System.out.println("Error for "+EXAMPLE2_FILE+" - number of steps: "+steps);

            return false;
        }

        System.out.println("Verified. Number of steps to find all keys: "+steps);
        
        input = Util.readMap(EXAMPLE3_FILE);

        theMap = new Map(input, _debug);

        System.out.println("\n"+theMap);

        exp = new Explorer(theMap, _debug);

        System.out.println("Number of keys and doors: "+theMap.numberOfKeys()+", "+theMap.numberOfDoors());

        System.out.println("\nTraversing map ...");

        steps = exp.findAllKeys();

        if (steps != EXAMPLE3_STEPS)
        {
            System.out.println("Error for "+EXAMPLE3_FILE+" - number of steps: "+steps);

            return false;
        }

        System.out.println("Verified. Number of steps to find all keys: "+steps);

        return true;
    }

    private boolean _debug;
}
@@ -2647,32 +2647,405 @@
 eys: %22+steps);%0A%0A
+        input = Util.readMap(EXAMPLE4_FILE);%0A%0A        theMap = new Map(input, _debug);%0A%0A        System.out.println(%22%5Cn%22+theMap);%0A%0A        exp = new Explorer(theMap, _debug);%0A%0A        System.out.println(%22Number of keys and doors: %22+theMap.numberOfKeys()+%22, %22+theMap.numberOfDoors());%0A%0A        System.out.println(%22%5CnTraversing map ...%22);%0A%0A        steps = exp.findAllKeys();%0A%0A
         return t

Update Verifier.java