ifステートメント内の同じクラス内の別のメソッドからメソッドを呼び出す方法

Question

booleanメソッドのifステートメントでstep（）メソッドの方向を呼び出そうとしていますが、可変方向。誰も私がこれを正しく行う方法を理解するのを助けることができますか？

public class SelfAvoidingRandomWalk 
{ 
    private char[][] board ; 
    private char symbol ; 
    private int lengthOfWalk, currRow, currColumn ; 

    public SelfAvoidingRandomWalk(int numRows, int numColumns, 
           int startRow, int startColumn) 
    { 
     board = new char[numRows][numColumns] ; 
     lengthOfWalk = 0 ; 
     symbol = '$' ; 
     board[startRow][startColumn] = symbol ; 
     currRow = startRow ; 
     currColumn = startColumn ; 
    } 

    private final static int NORTH = 8 ; 
    private final static int SOUTH = 2 ; 
    private final static int WEST = 4 ; 
    private final static int EAST = 6 ; 

    public void step(int direction) 
    { 
     if (direction == NORTH) 
     { 
      if (currRow == 0) 
      { 
       currRow = board.length ; 
      } 
      currRow-- ; 
      symbol = 'N' ; 
     } 
     else if (direction == SOUTH) 
     { 
      currRow = (currRow + 1) % board.length ; 
      symbol = 'S' ; 
     } 
     else if (direction == EAST) 
     { 
      currColumn = (currColumn + 1) % board[0].length ; 
      symbol = 'E' ; 
     } 
     else if (direction == WEST) 
     { 
      if (currColumn == 0) 
      { 
       currColumn = board[0].length ; 
      } 
      currColumn-- ; 
      symbol = 'W' ; 
     } 
     board[currRow][currColumn] = symbol ; 
    } 

    public boolean canTakeStep() 
    { 
     boolean stepOk = true ; 

     if (board[currRow + 1][currColumn] == symbol) 
     { 
      if (step(2) == SOUTH) 
      { 
       stepOk = false ; 
      } 
     } 

     if (board[currRow - 1][currColumn] == symbol) 
     { 
      if (step(8) == NORTH) 
      { 
       stepOk = false ; 
      } 
     } 

     if (board[currRow][currColumn + 1] == symbol) 
     { 
      if (step(6) == EAST) 
      { 
       stepOk = false ; 
      } 
     } 

     if (board[currRow][currColumn - 1] == symbol) 
     { 
      if (step(4) == WEST) 
      { 
       stepOk = false ; 
      } 
     } 

     return stepOk ; 
    } 

    public int length() 
    {   
     if (canTakeStep() == true) 
     { 
      lengthOfWalk++ ; 
     } 
     else 
     { 
      System.out.println("The length of your walk was: " + lengthOfWalk) ; 
     } 

     return lengthOfWalk ; 
    } 

    public void print() 
    { 
     printTopBottom() ; 

     for (int r = 0; r < board.length; r++) 
     { 
      System.out.print("|") ; 

      for (int c = 0; c < board[r].length; c++) 
      { 
       if (symbol == '$' || symbol == 'N' || symbol == 'S' || symbol == 'W' || symbol == 'E') 
       { 
        if (board[r][c] != symbol) 
        { 
         System.out.print(" ") ; 
        } 

        else 
        { 
         System.out.print(symbol) ; 
        } 
       } 
      } 

      System.out.println("|") ; 
     } 

     printTopBottom() ; 
    } 

    private void printTopBottom() 
    { 
     System.out.print("+") ; 

     for (int c = 0; c < board[0].length; c++) 
     { 
      System.out.print("-") ; 
     } 

     System.out.println("+") ; 
    } 
} 

そしてここで、ドライバクラスがメインメソッドである：

import java.util.Scanner ; 

public class Lab2 
{ 
    public static void main(String args[]) 
    { 
     Scanner input = new Scanner(System.in) ; 

     System.out.print("Enter number of rows: ") ; 
     int numRows = input.nextInt() ; 
     System.out.print("Enter number of columns: ") ; 
     int numColumns = input.nextInt() ; 
     System.out.print("Enter start row: ") ; 
     int startRow = input.nextInt() ; 
     System.out.print("Enter start column: ") ; 
     int startColumn = input.nextInt() ; 

     System.out.println() ; 

     SelfAvoidingRandomWalk selfAvoidingRandomWalk = new SelfAvoidingRandomWalk(numRows, numColumns, 
      startRow, startColumn) ; 

     selfAvoidingRandomWalk.print() ; 

     while (selfAvoidingRandomWalk.canTakeStep() == true) 
     { 
      System.out.print("Enter the direction you'd like to go: ") ; 
      int theMove = input.nextInt() ; 

      selfAvoidingRandomWalk.step(theMove) ; 
      selfAvoidingRandomWalk.print() ; 
     } 

     selfAvoidingRandomWalk.length() ; 
    } 
} 

Answer 1

あなたのステップの方法は、int型の方向パラメータを受け取り、あなたのcanTakeStep方法がありません。ステップメソッドで行っているのと同じ方法で変数を渡してください：

public boolean canTakeStep(int direction) 
{ 

}