fix bug + finished Robber class

Robber.java

 import java.util.*;
 
 public class Robber {
-    private int x, y, moveNum;
+    private int x;
+    private int y;
+    private int moveNum;
 
     public void setY(int y) {
         this.y = y;
@@ -15,6 +17,7 @@ public class Robber {
         this.moveNum = moveNum;
     }
 
+
     public int getY() {
         return y;
     }
@@ -27,37 +30,37 @@ public class Robber {
         return moveNum;
     }
 
-    public void moveRandomly(int length, int width) {
+    public void moveRandomly(int m, int n) {
         Random randomGenerator = new Random();
         moveNum++;
 
-        if (x != 0 && x != length - 1 && y != 0 && y != width - 1) {
+        if (x != 0 && x != m - 1 && y != 0 && y != n - 1) {
             int rx = randomGenerator.nextInt(3) - 1;
             int ry = randomGenerator.nextInt(3) - 1;
             x = x + rx;
             y = y + ry;
         }
 
-        if (x == 0 && y != 0 && y != width - 1) {
+        if (x == 0 && y != 0 && y != n - 1) {
             int rx = randomGenerator.nextInt(2);
             int ry = randomGenerator.nextInt(3) - 1;
             x = x + rx;
             y = y + ry;
         }
-        if (y == 0 && x != 0 && x != length - 1) {
+        if (y == 0 && x != 0 && x != m - 1) {
             int rx = randomGenerator.nextInt(3) - 1;
             int ry = randomGenerator.nextInt(2);
             x = x + rx;
             y = y + ry;
 
         }
-        if (x == length - 1 && y != 0 && y != width - 1) {
+        if (x == m - 1 && y != 0 && y != n - 1) {
             int rx = randomGenerator.nextInt(2) - 1;
             int ry = randomGenerator.nextInt(3) - 1;
             x = x + rx;
             y = y + ry;
         }
-        if (y == width - 1 && x != 0 && x != length - 1) {
+        if (y == n - 1 && x != 0 && x != m - 1) {
             int rx = randomGenerator.nextInt(3) - 1;
             int ry = randomGenerator.nextInt(2) - 1;
             x = x + rx;
@@ -69,19 +72,19 @@ public class Robber {
             x = x + rx;
             y = y + ry;
         }
-        if (x == length - 1 && y == 0) {
+        if (x == m - 1 && y == 0) {
             int rx = randomGenerator.nextInt(2) - 1;
             int ry = randomGenerator.nextInt(2);
             x = x + rx;
             y = y + ry;
         }
-        if (x == 0 && y == width - 1) {
+        if (x == 0 && y == n - 1) {
             int rx = randomGenerator.nextInt(2);
             int ry = randomGenerator.nextInt(2) - 1;
             x = x + rx;
             y = y + ry;
         }
-        if (x == length - 1 && y == width - 1) {
+        if (x == m - 1 && y == n - 1) {
             int rx = randomGenerator.nextInt(2) - 1;
             int ry = randomGenerator.nextInt(2) - 1;
             x = x + rx;