java - 如何覆盖TreeMap中的值？

Question

因此，我尝试通过另一个文件扫描多个文件，以查看某个单词出现的次数，“其他文件”被获取并放置在树形图中，每次扫描文件中的下一个单词等于映射中的 key 应该将其值增加 1。无论出于何种原因，它都无法正确替换值。我几乎肯定错误就在这个区域

while(fileArrayScan.hasNext())
{ 
                        try
                        {
                            String nextWord = fileArrayScan.next();
                            for(String key : tagsCount.keySet())
                            {
                                String currentKey = key;

                                if (currentKey.equals(nextWord));
                                {
                                    int value = tagsCount.get(key);
                                    tagsCount.put(key, value + 1);
                                }
                            }
                        }
                        catch(NoSuchElementException ex)
                        {
                            //if there is a random empty line it catches it
                        }
}

这就是全部内容

import javax.swing.JFrame;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author hurtks
 */
public class TagCloudGeneratorRunner {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) 
    {
        JFrame frame = new TagCloudGeneratorFrame();
        frame.setTitle("Kyle's Tag Cloud Generator");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

}

它被分成2个src文件(所有system.out.prints用于测试)

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Scanner;
import java.util.TreeMap;
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author hurtks
 */

public class TagCloudGeneratorFrame extends JFrame
{

public TagCloudGeneratorFrame()
{

//set the arraylist
final ArrayList<File> fileArray = new ArrayList();

//set the height and width of the frame
final int HEIGHT = 600;
final int WIDTH = 500;
Toolkit kit = Toolkit.getDefaultToolkit();
Dimension screenSize = kit.getScreenSize();
int screenHeight = screenSize.height;
int screenWidth = screenSize.width;
this.setLocation(screenWidth / 4, screenHeight / 4);

//set the panels that are going to be used
final JPanel mainPnl, chooserPnl, filePnl, controlPnl;

//set the buttons that are going to be used
final JButton chooseFileBtn, submitBtn, quitBtn;

//ser the file chooser
final JFileChooser chooser, tagChooser;
chooser = new JFileChooser();
tagChooser = new JFileChooser();


//set the textarea and scrollpane that are going to be used
final int AREA_ROWS = 10;
final int AREA_COLUMNS = 25;
//final int value = 0;

final JTextArea fileNameArea;
fileNameArea = new JTextArea(AREA_ROWS, AREA_COLUMNS);
fileNameArea.setEditable(false);
JScrollPane scrollPane = new JScrollPane(fileNameArea);
fileNameArea.setText("");

//create the panels and add them to the frame
mainPnl = new JPanel();
mainPnl.setLayout(new BorderLayout());
chooserPnl = new JPanel();
filePnl = new JPanel();
controlPnl = new JPanel();
mainPnl.add(chooserPnl, BorderLayout.NORTH);
mainPnl.add(filePnl, BorderLayout.CENTER);
mainPnl.add(controlPnl, BorderLayout.SOUTH);

add(mainPnl);
setSize(HEIGHT, WIDTH);

//create the components
chooseFileBtn = new JButton("New File");
submitBtn = new JButton("Submit");
quitBtn = new JButton("Quit");


//add the components to the GUI
chooserPnl.add(chooseFileBtn);
filePnl.add(scrollPane);
controlPnl.add(submitBtn);
controlPnl.add(quitBtn);

//add the listener to the quitBtn
class QuitButtonListener implements ActionListener
{
    public void actionPerformed(ActionEvent evt)
    {
        System.exit(0);
    }
}
ActionListener quitListener = new QuitButtonListener();
quitBtn.addActionListener(quitListener);

//add the listener to the chooseFileBtn
class chooseFileButtonListener implements ActionListener
{
    //set the arraylist
    //ArrayList<File> fileArray = new ArrayList<>();
    public void actionPerformed(ActionEvent evt)
    {
        if(chooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION)
        {
            File selectedFile = chooser.getSelectedFile();
            fileArray.add(selectedFile);
            fileNameArea.append("" + selectedFile + "\n");
            //return fileArray;

        }
    }
}
ActionListener chooseListener = new chooseFileButtonListener();
chooseFileBtn.addActionListener(chooseListener);

//add the listener to the submitBtn
class submitButtonListener implements ActionListener
{
    Map<String, Integer> tagsCount = new TreeMap();
    Scanner tagScanner;
    //JFileChooser tagChooser;
    //tagChooser = new JFileChooser();
    //PrintWriter output = new PrintWriter("htmlFile.txt");
    public void actionPerformed(ActionEvent evt)
    {

        try
        {
            JOptionPane.showMessageDialog(null, "Please Choose the file of Tags to scan for.");
            if(tagChooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION)
            {
            File tagFile = tagChooser.getSelectedFile(); 
            String fileDir = tagFile.getParent();
            File outputFile = new File(fileDir, "htmlFile.txt");
            PrintWriter output = new PrintWriter(outputFile);
            //File tagFile = tagChooser.getSelectedFile();
            tagScanner = new Scanner(tagFile); 
            while(tagScanner.hasNext())
            {
                tagsCount.put(tagScanner.next().toLowerCase(), 0);
            }
            for (int j = 0; j < fileArray.size(); j++)
            {
                File thisFile = fileArray.get(j);
                //Scanner for File Array
                Scanner fileArrayScan = new Scanner(thisFile);
                while(fileArrayScan.hasNext())
                { 
                    try
                    {
                        String nextWord = fileArrayScan.next();
                        System.out.println(nextWord + " next word in file");
                        for(String key : tagsCount.keySet())
                        {
                            String currentKey = key;
                            System.out.println(currentKey + " Current Key");

                            if (currentKey.equals(nextWord));
                            {
                                System.out.println(currentKey + " Current Key in if loop");
                                int value = tagsCount.get(key);
                                System.out.println(value + " value for key map");
                                tagsCount.put(key, value + 1);
                            }
                        }
                    }
                    catch(NoSuchElementException ex)
                    {
                        //if there is a random empty line it catches it
                    }
                }
                //System.out.println(thisFile);

            }
            output.println(tagsCount);
            System.out.println(tagsCount);
            JOptionPane.showMessageDialog(null, "The File was saved as 'htmlFile.html'");

            output.flush();
            output.close();         
        }
        }
        catch(FileNotFoundException ex)
        {
                    fileNameArea.append("The File could not be found, Try Again!");
        }
    }
}
ActionListener submitListener = new submitButtonListener();
submitBtn.addActionListener(submitListener);
}

}

Answer 1

删除此行中的分号:

if (currentKey.equals(nextWord));

它充当if的主体，并且它下面的大括号中的 block 总是被执行。将其更改为

if (currentKey.equals(nextWord))