set First place of robber added

Field.java

@@ -61,4 +61,26 @@ public class Field {
             }
         }
     }
+
+    public void setFirstPlaceOfRobber(){
+        int tmpX, tmpY, cnt = 0;
+
+        while (true){
+            Random randomGenerator = new Random();
+            tmpX = randomGenerator.nextInt(m);
+            tmpY = randomGenerator.nextInt(n);
+            for (Police police : polices) {
+                if (police.getX() == tmpX && police.getY() == tmpY) {
+                    cnt++;
+                    break;
+                }
+            }
+            if (cnt == 0){
+                Robber robber = new Robber();
+                fieldShape[tmpX][tmpY] = "-";
+                return;
+            }
+        }
+    }
+
 }