I have to use constructors in my assignment so i decided to create two mazes (using arrays) and save them in two separate classes (maze1 and maze2). Then i called the array and save the reference to another array named mazeChoice (Line 23) . After, i try to print out the maze by calling the output method (line 24). However when i does this a nullpointerException error pops up.
Any Ideas? Thanks in advance
import java.io.*;
public class MazeAssignment {
public final String FINISH = "X ";
public final String GO = ". ";
public int MAXCOL = 12;
public int MAXROW = 8;
public boolean success = false;
public static void main (String args[]) throws IOException {
Maze1 mazeOne = new Maze1();
String mazeChoice [][]=new String[8][12];
Maze2 mazeTwo = new Maze2();
MazeAssignment SA = new MazeAssignment();
int x, y, userInput;
System.out.println("Maze One");
mazeChoice = mazeOne.structure;
System.out.println();
System.out.println("Maze Two");
mazeChoice = mazeTwo.structure;
System.out.println();
System.out.println("Press 1 to solve Maze One, or press 2 to solve Maze 2");
userInput = SA.userInput();
if(userInput == 1){
mazeChoice = mazeOne.structure;
SA.output(mazeChoice);
}
else{
mazeChoice = mazeTwo.structure;
SA.output(mazeChoice);
}
System.out.println("Enter X Coordinate(Points 2 - 6)");
x = SA.userInput();
System.out.println("Enter Y Coordinate(Points 2 - 10)");
y = SA.userInput();
SA.output(mazeChoice);
mazeChoice = SA.solveMaze(x, y, mazeChoice);
mazeChoice = SA.cover(mazeChoice);
System.out.println();
SA.output(mazeChoice);
}
public void output(String mazeChoice[][]){
for (int count1 = 0; count1 < 8; count1++){
for (int count2 = 0; count2 < 12; count2++){
System.out.print(mazeChoice[count1][count2]);
}System.out.println();
}
}
public int userInput () throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
return Integer.parseInt(br.readLine());
}
class Maze1 {
String structure[][];
Maze1(){
String structure [][] = {
{" ", "1 ", "2 ", "3 ", "4 ", "5 ", "6 ", "7 ", "8 ", "9 ", "10 ", "11 "},
{"1 ", "B ", "B ", "B ", "B ", "B ", "B ", "B ", "B ", "B ", "B ", "B "},
{"2 ", "B ", ". ", ". ", ". ", "B ", ". ", "B ", ". ", ". ", ". ", "B "},
{"3 ", "B ", ". ", "B ", ". ", "B ", ". ", "B ", ". ", "B ", "B ", "B "},
{"4 ", "B ", ". ", "B ", ". ", ". ", ". ", ". ", ". ", ". ", ". ", "B "},
{"5 ", "B ", ". ", "B ", "B ", "B ", "B ", ". ", "B ", "B ", ". ", "B "},
{"6 ", "B ", ". ", "B ", ". ", ". ", ". ", ". ", ". ", "B ", ". ", "B "},
{"7 ", "B ", "B ", "B ", "B ", "B ", "B ", "B ", "X ", "B ", "B ", "B "},
};
}
}
class Maze2{
String structure[][];
Maze2(){
String structure [][] = {
{" ", "1 ", "2 ", "3 ", "4 ", "5 ", "6 ", "7 ", "8 ", "9 ", "10 ", "11 "},
{"1 ", "B ", "B ", "B ", "B ", "B ", "B ", "B ", "B ", "B ", "B ", "B "},
{"2 ", "B ", ". ", "B ", ". ", "B ", ". ", "B ", ". ", ". ", ". ", "B "},
{"3 ", "B ", ". ", "B ", ". ", "B ", ". ", "B ", ". ", "B ", "B ", "B "},
{"4 ", "B ", ". ", ". ", ". ", "B ", ". ", ". ", ". ", ". ", ". ", "B "},
{"5 ", "B ", ". ", "B ", ". ", "B ", ". ", "B ", "B ", "B ", ". ", "B "},
{"6 ", "B ", ". ", "B ", ". ", ". ", ". ", ". ", ". ", "B ", "X ", "B "},
{"7 ", "B ", "B ", "B ", "B ", "B ", "B ", "B ", "B ", "B ", "B ", "B "},
};
}
}
