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。
我的程序下面没有正确读取文件我不会想，因为每次我点击菜单中的处理，我都会得到一个0的矩阵。请帮助。
CLASS：
// 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
}
DRIVER：
// 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;
}
}
}
答案 0 :(得分：1)
问题在于这一行：
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中一样传递InputStream或File或其他内容。
答案 1 :(得分：1)
您的文件选择器会为您提供一个文件，您可以直接使用扫描仪：
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
}
答案 2 :(得分：0)
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。