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基本上我在这里所做的是将文本文件的内容导入用户输入字段（其中有 7 个。我运行一个循环来遍历它们以获取命令 [i]。代码在控制台中运行良好，但它不适用于 GUI，因为它只输入每个字段的最后一行。你知道问题是什么吗？这是 UI：

http://imageshack.us/f/692/21778853.jpg

如您所见，它可以很好地打印到控制台中，但是当我通过单击 GUI 上的导入来导入数据时，它只会放置 txt 文件的最后一个命令

我的代码是： 

    final JTextField Command[];//Create one dimensional array 
    Command = new JTextField[8];//Declare Command as a JTextField 
    for (int i = 1; i < 8; i++)//Run the loop through each selection 
    { 
        Command[i] = new JTextField(i);//Read through each text field
    }
    //Add user input fields including their absolute position on the panel
    Command[1].setText("Please enter the commands...");//Starting text
    Command[1].setBounds(121, 13, 236, 25);//Set the position of the text field
    getContentPane().add(Command[1]);//Add this text field to the content
            Command[2].setBounds(121, 47, 236, 25);/fsdfsdf
    getContentPane().add(Command[2]);

    Command[3].setBounds(121, 83, 236, 25);/fasdfasd
    getContentPane().add(Command[3]);

    Command[4].setBounds(121, 119, 236, 25);/fsfasdasdf
    getContentPane().add(Command[4]);

    Command[5].setBounds(121, 155, 236, 25);
    getContentPane().add(Command[5]);

    Command[6].setBounds(121, 191, 236, 25);
    getContentPane().add(Command[6]);

    Command[7].setBounds(121, 227, 236, 25);
    getContentPane().add(Command[7]);  

            //IMPORT FILE   
    JMenuItem Import = new JMenuItem("Import");
    File.add(Import);
    Import.addActionListener(new ActionListener() {//Call up ActionListener function
        public void actionPerformed(ActionEvent arg0) {//Event handler
            try {
                //use buffering, reading one line at a time
                //FileReader always assumes default encoding is OK!
                BufferedReader input = new BufferedReader(new FileReader("W:\\EclipsePortable\\Data\\workspace2\\" +
                                        "RobotController\\src\\RobotController\\Import commands.txt"));
                try {
                    String line = null; //not declared within while loop
                    while (( line = input.readLine()) != null) {
                        System.out.println(line);//Print the lines
                        for(int i = 1; i < 8; i++) {
                        Command[i].setText(line);
                    }
                }}
                finally {
                    input.close();
                }
            }
            catch (IOException ex){
                ex.printStackTrace();
            }
    }});`
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1 回答 1

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因此，在您的文件导入代码中，您正在执行此操作...

for(int i = 1; i < 8; i++) {
    Command[i].setText(line);

它将当前文本行应用于所有字段（所有字段的同一行文本），这意味着当您完成读取文件时，您只得到文件的最后一行。

相反，我会保留对字段索引的引用并在读取的每一行中递增

添加示例

                String line = null; //not declared within while loop
                int fieldIndex = 0;
                while (( line = input.readLine()) != null) {
                    System.out.println(line);//Print 
                    Command[fieldIndex].setText(line);
                    fieldIndex++
                    if (fieldIndex > 7) {
                        break;
                    }
于 2013-02-03T20:04:01.830 回答