Question

Java新手 - 我正在尝试导入包含整数的.txt文件。最后我想将整数导入到一个arraylist中，然后创建一个频率分布并计算平均值。

目前我正在努力使用文件对话框，这是我的最终目标。我可以使用显示的代码中的文件路径导入.txt。如果有人可以帮我解决如何使用对话框的问题，我们将不胜感激！

import java.io.*;
import java.util.*;

public class Distribution {

    public static void main(String[] args) {

        Scanner input = new Scanner (System.in);

        System.out.println("Enter a complete file path to file you would like to open:");
        String fileName = input.nextLine();

        File inFile = new File(fileName);

        FileReader ins = null;

        try {
            ins = new FileReader(inFile);
            int ch;
            while ((ch = ins.read()) != -1) {
                System.out.print((char) ch);
            }
        } 
        catch (Exception e) {
            System.out.println(e);
        } 
        finally {
            try {
                ins.close();
            } 
            catch (Exception e) {
            }
        }

    } // main end
}

Answer 1

嗯，这很简单。

import java.io.File;
import java.io.FileReader;
import java.util.Scanner;

import javax.swing.JFileChooser;
import javax.swing.filechooser.FileNameExtensionFilter;

class DistributionUI {

    public static void main(String[] args) {
        System.out.println("Enter a complete file path to file you would like to open:");

        final JFileChooser fchooser = new JFileChooser() {

            private static final long serialVersionUID = 1L;

            public void approveSelection() {
                File inFile = getSelectedFile();

                if (inFile.exists() ) {
                    FileReader ins = null;

                    try {
                        ins = new FileReader(inFile);
                        int ch;
                        while ((ch = ins.read()) != -1) {
                            System.out.print((char) ch);
                        }
                    } catch (Exception e) {
                        System.out.println(e);
                    } finally {
                        try {
                            ins.close();
                        } catch (Exception e) {
                        }
                    }
                }
                super.approveSelection();
            }
        };
        fchooser.setCurrentDirectory(new File("."));
        fchooser.setAcceptAllFileFilterUsed(false);
        FileNameExtensionFilter filter = new FileNameExtensionFilter("my file", "txt");
        fchooser.addChoosableFileFilter(filter);
        fchooser.showOpenDialog(null);


    } // main end
}

使用文件对话框而不是FilePath Java

1 个答案: