Java 设置UI内容只会添加最后一行

基本上，我在这里做的是将文本文件的内容导入到用户输入字段中（共有7个字段）。我对命令[I]运行了一个循环来遍历这些字段。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。您知道问题出在哪里吗？以下是UI：

    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();
            }
    }});`

    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();
            }
    }});`

如您所见，它可以很好地打印到控制台中，但是当我通过在GUI上单击import导入数据时，它只会放入txt文件的最后一个命令

    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();
            }
    }});`

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();
            }
    }});`

final JTextField命令[]；//创建一维数组
Command=newjtextfield[8]；//将命令声明为JTextField
for（int i=1；i<8；i++）//在每个选择中运行循环
{ 
Command[i]=newjtextfield（i）；//通读每个文本字段
}
//添加用户输入字段，包括其在面板上的绝对位置
命令[1].setText（“请输入命令…”）；//开始文本
命令[1]。setBounds（121、13、236、25）；//设置文本字段的位置
getContentPane（）.add（命令[1]）；//将此文本字段添加到内容
命令[2].setBounds（121,47,236,25）；/fsdfsdf
getContentPane（）.add（命令[2]）；
命令[3].setBounds（121,83,236,25）；/fasdfasd
getContentPane（）.add（命令[3]）；
命令[4].setBounds（121、119、236、25）；/fsfasdasdf
getContentPane（）.add（命令[4]）；
命令[5]。设置边界（121、155、236、25）；
getContentPane（）.add（命令[5]）；
命令[6].setBounds（12119123625）；
getContentPane（）.add（命令[6]）；
命令[7]。设置边界（121、227、236、25）；
getContentPane（）.add（命令[7]）；
//导入文件
JMenuItem导入=新的JMenuItem（“导入”）；
添加（导入）；
Import.addActionListener（新ActionListener（）{//调用ActionListener函数
public void actionPerformed（ActionEvent arg0）{//事件处理程序
试一试{
//使用缓冲，一次读取一行
//FileReader始终假定默认编码是正确的！
BufferedReader输入=新的BufferedReader（新文件读取器（“W:\\EclipsePortable\\Data\\workspace2\\”+
“RobotController\\src\\RobotController\\Import commands.txt”）；
试一试{
String line=null；//未在while循环中声明
而（（line=input.readLine（））！=null）{
System.out.println（行）；//打印行
对于（int i=1；i<8；i++）{
命令[i].setText（行）；
}
}}
最后{
input.close（）；
}
}
捕获（IOEX异常）{
例如printStackTrace（）；
}
}});`

因此，在文件导入代码中，您正在执行以下操作

    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();
            }
    }});`

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

---

你想要什么行为？你想要第一个输入包含第一行，第二个输入-第二行ant等？也请以小写字母开始变量名。在Java中用大写字母很难阅读。非常感谢！这对我来说非常有效，尽管我必须输入fieldIndex=fieldIndex+1，而不是fieldIndex++，因为它不起作用出于某种原因；再次感谢：）这很奇怪，fieldIndex++是fieldIndex=fieldIndex+1或fieldIndex+=1的简写。。我认为这与我使用的软件有关