Question

Need Help ASAP!! Below is my code and i am getting error in (public interface stack) and in StackImplementation class. Please help me fix it. Please provide a solution so i can fix the error.

thank you....

package mazeGame;
import java.io.*;
import java.util.*;
public class mazeGame {
   static String[][]maze;
   public static void main(String[] args)
   {
   maze=new String[30][30];
   maze=fillArray("mazefile.txt");
   }
   public static String[][]fillArray(String file)
   {
   maze = new String[30][30];
  
   try{
   Scanner sc = new Scanner(new File(file));
  
   for(int row = 0; row < 30; row++)
   {
   for(int col = 0; col < 30; col++)
   {
   maze[row][col] = sc.next();
   }
   sc.nextLine();
   }
   printArray();
   }
   catch(FileNotFoundException fe)
   {
   System.out.println("Error: file mazefile.txt not found!");
   }
   return maze;
   }
   public static void printArray()
   {
   System.out.println();
   for(int row=0;row<30;row++)
   {
   for(int col=0;col<30;col++)
   {
   System.out.print(maze[row][col]+" ");
   }
   System.out.println();
   }

   }

   public void location()
   {

   System.out.println("Please enter from the Matrix location S.");
   Scanner StartingPoint = new Scanner(System.in);
   String index = StartingPoint.nextLine();
   String[] indices = index.split(" ");
   }
   public String getByte( String arrayValue, int index)
   throws IllegalArgumentException, ArrayIndexOutOfBoundsException
   {
  
   //return arrayValue;
   //placing this statement at the end because they are not reachable because of this

   String x = arrayValue;
   switch (x.charAt(0)) {
   case '0':
   //push();//dfine this method to use
   //S = StartingPoint; // they both are not declared any where
   System.out.println("S");
   break;
   case '1':
   //Move();//define this method to use
   System.out.println("Help, I am trapped");
   break;
   case 'E':
   //Exit();
   System.out.println("I am free");
   break;

   default:
   //doSomethingElse();
   }
   return arrayValue;
   }
   }
public interface Stack
   {
   public void push(Object X);
   public void pop();
   public void top();
   Object move();
   boolean isEmpty();

  
   }

public interface Stack public void push(Object X); public void pop(); public void top); Object move(); boolean isEmpty();

Answer 1

The code seems to be incomplete. I can't understand what you are trying to achieve. I'll point out the errors that I found.

You need to understand the basic concepts of Java.

1. Make sure Stack interface is created within a separate file. You should not append it with another class in the same file. The error in Stack interface can be corrected by this.

2. In StackImplementation class, you need to implement all the methods from Stack interface. You have not implemented move() and isEmpty() methods in StackImplementation.

3. There is no such Exception in java called UnderflowException. You must define the custom exception UnderflowException in a separate class if you need so. Or just use Exception itself instead of UnderflowException.

4. fillArray() is defined in class mazeGame as static. You should call this static method as mazeGame.fillArray().

(i.e: className.methodName())

5. You need to pass a String object to the method fillArray() since you have declared it with public static String[][] fillArray(String file) in mazeGame.

6. Variable maze in class mazeGame is static. So you should call the variable as mazeGame.maze.

7. Variables topofStack and theArray are not declared in class StackImplementation.

8. top() is defined wih return type void, but you are returning a variable from it. Make sure you have given the proper return type in method top().

9. In method push(Object X) consider using String instead of Object. You seem to be using String to read value in mazeGame. String is a subtype of Object and not vice versa. You might get compile time error saying incompatible type. You can only pass same type or subtype of the parameter in the method.