设置UI内容只添加最后一行

Question

基本上，我在这里所做的是将文本文件的内容导入到用户输入字段中（共有7个。我为命令[I]运行一个循环来遍历它们。代码在控制台中运行良好，但对GUI不起作用，因为它只为每个字段输入最后一行。你知道问题是什么吗？下面是UI:

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

正如您所看到的，它可以很好地打印到控制台中，但当我通过在GUI上单击导入来导入数据时，它只会放入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();
            }
    }});`

Answer 1

因此，在文件导入代码中，您正在执行以下操作。。。

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

这是将当前的文本行应用于所有字段（所有字段都是同一行文本），这意味着当你完成读取文件时，你只得到了文件的最后一行。

相反，我会在读取的每一行中保留字段索引和增量的参考

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;
                    }