读取2D数组文本文件java

Question

我正在尝试开发一个基于GUI的程序来从文本文件中读取矩阵的条目。 第一个数字是行数; 第二个数字是列数。 其余数字是逐行排序的1到9之间的整数。 扫描矩阵，突出显示（以不同颜色显示条目）所有细胞，这些细胞形成一组五个细胞，水平，垂直或对角具有相同的值。

我的下面的程序是没有正确读取文件我不认为因为每次我点击我的菜单中的处理，我得到一个0的矩阵。 请帮忙。

类：

 // GUI-related imports

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Scanner;

// File-related imports

import java.io.FileReader;   // both needed
import java.io.BufferedReader;  // for line input

import java.io.IOException;


public class FiveInARow
{

 byte[][] tag = new byte[100][100];
 int[][] matrix = new int[100][100];
 int row;
 int col;
 String filePath, fileName;

 // Constructor
 public FiveInARow()
 {
  row = 0;
  col = 0;
 }

 public void ReadFile()
 {
  // Initialize TAG(s) to 0
  for(int i =0; i< tag.length; i++)
    for(int j =0; i< tag.length; j++)
       tag[i][j] = 0;

  //Place open dialogue here
  String filePath = null;
  String fileName = null;

      JFileChooser chooser = new JFileChooser();
      chooser.setDialogType(JFileChooser.OPEN_DIALOG );
      chooser.setDialogTitle("Open Data File");

         int returnVal = chooser.showOpenDialog(null);
         if( returnVal == JFileChooser.APPROVE_OPTION) 
          {
             filePath = chooser.getSelectedFile().getPath();
             fileName = chooser.getSelectedFile().getName();
           }


  // Define & Instantiate File
  Scanner inputStream = new Scanner(filePath);
  row  = inputStream.nextInt();
  col  = inputStream.nextInt();

  for(int i =0; i< row; i++)    // rows
  {
   for(int j = 0; j < col; j++)   //columns
   {
     matrix[i][j] = inputStream.nextInt();
   }

  }

 } // End of ReadFile method



 public void Process()
 {

  // Go through the matrix
  for(int i = 0; i < row; i++)
  {
    for(int j = 0; j < col; j++)
    {
      // Checking the matrix horizantally
      if(j <= col-5)  // Checks the boundaries of horizantal elements

        if (matrix[i][j] == matrix[i][j+1]
            &&(matrix[i][j+1] == matrix[i][j+2])
            &&(matrix[i][j+2] == matrix[i][j+3])
            &&(matrix[i][j+3] == matrix[i][j+4]))

        tag[i][j] = 1;

        // Checking the matrix vertically
       if(i <= row-5)  // Checks the boundaries of vertical elements

        if (matrix[i][j] == matrix[i+1][j]
            &&(matrix[i+1][j] == matrix[i+2][j])
            &&(matrix[i+2][j] == matrix[i+3][j])
            &&(matrix[i+3][j] == matrix[i+4][j]))

        tag[i][j] = 2;

       // Checking the matrix's right diagnol CHANGEEEEE
       if (matrix[i][j] == matrix[i+1][j]
            &&(matrix[i+1][j] == matrix[i+2][j])
            &&(matrix[i+2][j] == matrix[i+3][j])
            &&(matrix[i+3][j] == matrix[i+4][j]))

        tag[i][j] = 3;

       // Checking the matrix's left diagnol   CHANGEEE
       if (matrix[i][j] == matrix[i+1][j]
            &&(matrix[i+1][j] == matrix[i+2][j])
            &&(matrix[i+2][j] == matrix[i+3][j])
            &&(matrix[i+3][j] == matrix[i+4][j]))

        tag[i][j] = 4;
    }
  }


 } // End of Process method





}

司机：

    // GUI-related imports

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.Scanner;

// File-related imports
import java.io.FileReader;   // both needed
import java.io.IOException;

public class  Project3Main extends Frame implements ActionListener
{
 // File Parameters
 FiveInARow f = new FiveInARow();
 String dataFilePath = null;
 String dataFileName = null;
 int[][] Data = new int[100][100];
 int[][] Tag = new int [100][100];
 int row = 0;
 int column = 0;

 // Retrieved command code
 String command = "";

 public static void main(String[] args)
 {
  Frame frame = new  Project3Main();

  frame.setResizable(true);
  frame.setSize(1000,700);
  frame.setVisible(true);

 }

 public  Project3Main()
 {
  setTitle("2D Arrays");

  // Create Menu Bar
  MenuBar mb = new MenuBar();
  setMenuBar(mb);

  // Create Menu Group Labeled "File"
  Menu fileMenu = new Menu("File");

  // Add it to Menu Bar
  mb.add(fileMenu);

  // Create Menu Items
  // Add action Listener 
  // Add to "File" Menu Group
   MenuItem miReadData = new MenuItem("Read Data");
   miReadData.addActionListener(this);
   fileMenu.add(miReadData);

   MenuItem miProcess = new MenuItem("Process");
   miProcess.addActionListener(this);
   fileMenu.add(miProcess);

   MenuItem miExit = new MenuItem("Exit");
   miExit.addActionListener(this);
   fileMenu.add(miExit);

  // End program when window is closed
  WindowListener l = new WindowAdapter()
  {

   public void windowClosing(WindowEvent ev)
   {
    System.exit(0);
   }

   public void windowActivated(WindowEvent ev)
   {
    repaint();
   }

   public void windowStateChanged(WindowEvent ev)
   {
    repaint();
   }

  };

  ComponentListener k = new ComponentAdapter()
  {
   public void componentResized(ComponentEvent e) 
   {
          repaint();           
      }
  };

  // register listeners
  this.addWindowListener(l);
  this.addComponentListener(k);

 }

//******************************************************************************
//  called by windows manager whenever the application window performs an action
//  (select a menu item, close, resize, ....
//******************************************************************************

 public void actionPerformed (ActionEvent ev)
  {
   // figure out which command was issued  
   command = ev.getActionCommand();

   // take action accordingly 
   if("Read Data".equals(command))
   {

///////////////////////////////////////////////////////////////// call readfile method in your class to do this
f.ReadFile();



                                dataFilePath = null;
    dataFileName = null;

      JFileChooser chooser = new JFileChooser();
      chooser.setDialogType(JFileChooser.OPEN_DIALOG );
      chooser.setDialogTitle("Open Data File");

         int returnVal = chooser.showOpenDialog(null);
         if( returnVal == JFileChooser.APPROVE_OPTION) 
          {
             dataFilePath = chooser.getSelectedFile().getPath();
             dataFileName = chooser.getSelectedFile().getName();
           }
         try 
     {   


           /*
       * Scan the file and place it's contents into an array of Integers.
       */
       Scanner inputStream  = new Scanner(new FileReader(dataFilePath));
       int intLine;
       row = inputStream.nextInt();
       column = inputStream.nextInt();
        for (int i=0; i < row; i++)
        {
          for (int j = 0 ; j < column; j++)
          {

            intLine = inputStream.nextInt();
          } 
        }
     }

     catch(IOException ioe)
     {
      System.exit(0);
     }
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
    repaint();
   }
   else
    if("Process".equals(command))
    {
     // call process method in your class 
     f.Process();
     // determine if cells form a 5-cell same-valued block, mark them true in Tags array



     repaint();
    }
   else
    if("Exit".equals(command))
    {
     System.exit(0);
    }

  }
//********************************************************
// called by repaint() to redraw the screen
//********************************************************

  public void paint(Graphics g)
  {

   int ww = (int)this.getWidth();
   int wh = (int)this.getHeight() -40;

   if("Read Data".equals(command))
   {
    // Acknowledge that file was opened
    if (dataFileName != null)
    {
     g.drawString("File --  "+dataFileName+"  -- was successfully opened", ww/2-150, wh/2);
    }
    else
    {
     g.drawString("NO File is Open", 400, 400);
    }

    return; 
   }
   else
   if("Process".equals(command))
   {


    // Display the results
    int x = (ww-column*20)/2;
    int y = (wh-row*20)/2;

    for (int i=0; i<row; i++)
    {
     for (int j=0; j<column; j++)
     {
      g.setColor(Color.BLACK);
      if (Tag[i][j] == 1)
       g.setColor(Color.RED);
      //******* set color for the other directions

      g.drawString( ((Integer)Data[i][j]).toString(), x, y);
      x=x+20;
     }
    x = (ww-column*20)/2;
    y=y+20;
    }
    return; 
   }

  }

}

Answer 1

问题是这一行：

Scanner inputStream = new Scanner(filePath);

filePath是一个String。 Scanner在其构造函数中接受String，但随后它将String视为源。 它永远不会加载文件。

您需要像在Driver中那样传递InputStream或File或其他内容。

Answer 2

您的文件选择器会为您提供一个文件，您可以直接使用您的扫描仪：

File chosenFile = null;
int returnVal = chooser.showOpenDialog(null);
if( returnVal == JFileChooser.APPROVE_OPTION) 
{
    chosenFile =  chooser.getSelectedFile();
}

Scanner inputStream;
// Define & Instantiate File
if (chosenFile != null) {
    inputStream = new Scanner(chosenFile);
} 
else {
    // handle appropriately
}

Answer 3

将您对扫描仪的使用更改为：

Scanner inputStream  = = new Scanner(new File("filename"));;
String line = scanner.nextLine();
String[] numbers = line.split(" "); 
for(String str : numbers){
  int nunber = Interger.parseInt(str);
}

这将一次读取文件的一行，将其拆分为空格（自己获取数字），然后将它们从字符串更改为int。 我认为它获取字符串因此nextInt（）没有值并且获取默认值。