在java swing中向JTextfield添加列

【问题标题】：Adding columns to JTextfield in java swing在java swing中向JTextfield添加列
【发布时间】：2015-11-05 22:42:36
【问题描述】：

我必须创建一个 Jtextfield，用户将在其中输入大约 30 个字符。我创建了 15 个单独的 Jtextfield，并让用户在每个 Jtextfield 中只输入 2 个字符。当用户在第一个字段中输入两个字符时，它会自动跳转到下一个字段并继续进行，直到达到 30 个字符。

我的问题是，有没有更好的方法来创建 Jtextfield。我们可以创建一个 Jtextfield 并将其划分为 15 个分区，并为输入字符提供相同的流程，而不是创建单独的 15 个 Jtextfield。 如果这不是一个好的解决方案，请帮助我找到更好的解决方案。 提前致谢

我的代码

    cmd1=new JLabel("Command");
    cmd1.setBounds(20, 76, 70, 30);
    cmd1.setFont(new Font("serif",Font.BOLD,13));
    commandpanel.add(cmd1);

    cmdtext1=new JTextField();
    cmdtext1.setBounds(80, 80,70,25);
    commandpanel.add(cmdtext1);

    examplelabel=new JLabel("Enter HexaDecimal values (For example : 45,1E) ");
    examplelabel.setBounds(260, 50, 250,25);
    examplelabel.setFont(new Font("serif",Font.PLAIN,12));
    commandpanel.add(examplelabel);


    delete1=new JButton("Delete");
    delete1.setBounds(606, 80, 70, 25);
    commandpanel.add(delete1);


    command11=new JTextField(2);
    command11.setBounds(155,80,25,25);      
    command11.setDocument(new JTextFieldLimit(2));
    command11.addKeyListener(new KeyListener()
    {

        @Override
        public void keyTyped(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }

        @Override
        public void keyReleased(KeyEvent e)
        {
            // TODO Auto-generated method stub
            if(command11.getText().length() == 2)
            {
                command12.requestFocus();
            }

        }

        @Override
        public void keyPressed(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }
    });
    commandpanel.add(command11);

    command12=new JTextField();
    command12.setBounds(180,80,25,25);
    command12.setDocument(new JTextFieldLimit(2));
    command12.addKeyListener(new KeyListener()
    {

        @Override
        public void keyTyped(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }

        @Override
        public void keyReleased(KeyEvent e)
        {
            // TODO Auto-generated method stub
            if(command12.getText().length() == 2)
            {
                command13.requestFocus();
            }
        }

        @Override
        public void keyPressed(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }
    });
    commandpanel.add(command12);

    command13=new JTextField();
    command13.setBounds(205,80,25,25);
    command13.setDocument(new JTextFieldLimit(2));
    command13.addKeyListener(new KeyListener()
    {

        @Override
        public void keyTyped(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }

        @Override
        public void keyReleased(KeyEvent e)
        {
            // TODO Auto-generated method stub
            if(command13.getText().length() == 2)
            {
                command14.requestFocus();
            }
        }

        @Override
        public void keyPressed(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }
    });
    commandpanel.add(command13);

    command14=new JTextField();
    command14.setBounds(230,80,25,25);
    command14.setDocument(new JTextFieldLimit(2));
    command14.addKeyListener(new KeyListener()
    {

        @Override
        public void keyTyped(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }

        @Override
        public void keyReleased(KeyEvent e)
        {
            // TODO Auto-generated method stub
            if(command14.getText().length() == 2)
            {
                command15.requestFocus();
            }
        }

        @Override
        public void keyPressed(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }
    });
    commandpanel.add(command14);

    command15=new JTextField();
    command15.setBounds(255,80,25,25);
    command15.setDocument(new JTextFieldLimit(2));
    command15.addKeyListener(new KeyListener()
    {

        @Override
        public void keyTyped(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }

        @Override
        public void keyReleased(KeyEvent e)
        {
            // TODO Auto-generated method stub
            if(command15.getText().length() == 2)
            {
                command16.requestFocus();
            }
        }

        @Override
        public void keyPressed(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }
    });
    commandpanel.add(command15);

    command16=new JTextField();
    command16.setBounds(280,80,25,25);
    command16.setDocument(new JTextFieldLimit(2));
    command16.addKeyListener(new KeyListener()
    {

        @Override
        public void keyTyped(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }

        @Override
        public void keyReleased(KeyEvent e)
        {
            // TODO Auto-generated method stub
            if(command16.getText().length() == 2)
            {
                command17.requestFocus();
            }
        }

        @Override
        public void keyPressed(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }
    });
    commandpanel.add(command16);

    command17=new JTextField();
    command17.setBounds(305,80,25,25);
    command17.setDocument(new JTextFieldLimit(2));
    command17.addKeyListener(new KeyListener()
    {

        @Override
        public void keyTyped(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }

        @Override
        public void keyReleased(KeyEvent e)
        {
            // TODO Auto-generated method stub
            if(command17.getText().length() == 2)
            {
                command18.requestFocus();
            }
        }

        @Override
        public void keyPressed(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }
    });
    commandpanel.add(command17);

    command18=new JTextField();
    command18.setBounds(330,80,25,25);
    command18.setDocument(new JTextFieldLimit(2));
    command18.addKeyListener(new KeyListener()
    {

        @Override
        public void keyTyped(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }

        @Override
        public void keyReleased(KeyEvent e)
        {
            // TODO Auto-generated method stub
            if(command18.getText().length() == 2)
            {
                command19.requestFocus();
            }
        }

        @Override
        public void keyPressed(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }
    });
    commandpanel.add(command18);

    command19=new JTextField();
    command19.setBounds(355,80,25,25);
    command19.setDocument(new JTextFieldLimit(2));
    command19.addKeyListener(new KeyListener()
    {

        @Override
        public void keyTyped(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }

        @Override
        public void keyReleased(KeyEvent e)
        {
            // TODO Auto-generated method stub
            if(command19.getText().length() == 2)
            {
                command110.requestFocus();
            }
        }

        @Override
        public void keyPressed(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }
    });
    commandpanel.add(command19);

    command110=new JTextField();
    command110.setBounds(380,80,25,25);
    command110.setDocument(new JTextFieldLimit(2));
    command110.addKeyListener(new KeyListener()
    {

        @Override
        public void keyTyped(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }

        @Override
        public void keyReleased(KeyEvent e)
        {
            // TODO Auto-generated method stub
            if(command110.getText().length() == 2)
            {
                command111.requestFocus();
            }
        }

        @Override
        public void keyPressed(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }
    });
    commandpanel.add(command110);

    command111=new JTextField();
    command111.setBounds(405,80,25,25);
    command111.setDocument(new JTextFieldLimit(2));
    command111.addKeyListener(new KeyListener()
    {

        @Override
        public void keyTyped(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }

        @Override
        public void keyReleased(KeyEvent e)
        {
            // TODO Auto-generated method stub
            if(command111.getText().length() == 2)
            {
                command112.requestFocus();
            }
        }

        @Override
        public void keyPressed(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }
    });
    commandpanel.add(command111);

    command112=new JTextField();
    command112.setBounds(430,80,25,25);
    command112.setDocument(new JTextFieldLimit(2));
    command112.addKeyListener(new KeyListener()
    {

        @Override
        public void keyTyped(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }

        @Override
        public void keyReleased(KeyEvent e)
        {
            // TODO Auto-generated method stub
            if(command112.getText().length() == 2)
            {
                command113.requestFocus();
            }
        }

        @Override
        public void keyPressed(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }
    });
    commandpanel.add(command112);

    command113=new JTextField();
    command113.setBounds(455,80,25,25);
    command113.setDocument(new JTextFieldLimit(2));
    command113.addKeyListener(new KeyListener()
    {

        @Override
        public void keyTyped(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }

        @Override
        public void keyReleased(KeyEvent e)
        {
            // TODO Auto-generated method stub
            if(command113.getText().length() == 2)
            {
                command114.requestFocus();
            }
        }

        @Override
        public void keyPressed(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }
    });
    commandpanel.add(command113);

    command114=new JTextField();
    command114.setBounds(480,80,25,25);
    command114.setDocument(new JTextFieldLimit(2));
    command114.addKeyListener(new KeyListener()
    {

        @Override
        public void keyTyped(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }

        @Override
        public void keyReleased(KeyEvent e)
        {
            // TODO Auto-generated method stub
            if(command114.getText().length() == 2)
            {
                command115.requestFocus();
            }
        }

        @Override
        public void keyPressed(KeyEvent e) 
        {
            // TODO Auto-generated method stub

        }
    });
    commandpanel.add(command114);

    command115=new JTextField();
    command115.setBounds(505,80,25,25);       
    command115.setDocument(new JTextFieldLimit(2));
    commandpanel.add(command115);

    add1=new JButton("Add");
    add1.setBounds(547, 80,56,25);
    add1.addActionListener(new ActionListener()
    {

        @Override
        public void actionPerformed(ActionEvent e)
        {
            // TODO Auto-generated method stub
         add1();

        }

    });
    commandpanel.add(add1);

【问题讨论】：

  • 只需使用 for 循环。如果不发布代码，将很难获得任何帮助！
  • 是不是不能把Jtextfield分成15个分区。
  • 由于声誉较低，我无法发布图片
  • 在KeyListener 上使用DocumentFilter，有关详细信息，请参阅Implementing a Document Filter 和DocumentFilter Examples
  • 我不久前根据相同的概念创建了一个时间字段，看看this example 和this example 了解您可能面临的一些复杂性

标签： java swing jtextfield jformattedtextfield


【解决方案1】：

我认为这就是您要寻找的。没写完，但你明白了！

import java.util.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

public class JComponentLayout extends JFrame implements KeyListener{
    JLabel cmd1;
    JButton add1;
    JTextField cmdtext1;
    JButton delete1;
    JLabel examplelabel;


    Vector<Component> fields = new Vector<Component>(15);
    JPanel commandpanel = new JPanel(new FlowLayout());
   public static void main(String [] args){
       new JComponentLayout();
   }
   public JComponentLayout(){
  cmd1=new JLabel("Command");
    cmd1.setBounds(20, 76, 70, 30);
    cmd1.setFont(new Font("serif",Font.BOLD,13));
    commandpanel.add(cmd1);

    cmdtext1=new JTextField();
    cmdtext1.setBounds(80, 80,70,25);
    commandpanel.add(cmdtext1);

    examplelabel=new JLabel("Enter HexaDecimal values (For example : 45,1E) ");
    examplelabel.setBounds(260, 50, 250,25);
    examplelabel.setFont(new Font("serif",Font.PLAIN,12));
    commandpanel.add(examplelabel);


    for(int e = 0;  e < 15; ++e){
        JTextField command = new JTextField(2);
        command.addKeyListener(this);
        commandpanel.add(command);
        fields.add(command);
    }


    delete1=new JButton("Delete");
    delete1.setBounds(606, 80, 70, 25);
    commandpanel.add(delete1);


    add1=new JButton("Add");
    add1.setBounds(547, 80,56,25);
    add1.addActionListener(new ActionListener()
    {

        @Override
        public void actionPerformed(ActionEvent e){
            // TODO Auto-generated method stub
        }

    });

    commandpanel.add(add1);
    this.add(commandpanel);
    this.setVisible(true);
   }



    @Override
    public void keyTyped(KeyEvent e) 
    {
        // TODO Auto-generated method stub

    }

    @Override
    public void keyReleased(KeyEvent e){
        JTextField source = (JTextField)e.getSource();

        // TODO Auto-generated method stub
        if(source.getText().length() == 2){
            fields.get((1 + fields.indexOf(source)) 
            % fields.size()).requestFocus();
        }       
    }

    @Override
    public void keyPressed(KeyEvent e) 
    {
        // TODO Auto-generated method stub

    }
}

【讨论】：

  • 我理解关键监听器，但我只想创建一个 jtextfield。我尝试使用 JFormattedtextfield 但如果我输入 5 个字符且格式为 30 个字符，则不会显示该值
  • 如何从 jformattedtextfield 中检索值并打印
  • 对不起，我没有得到你想要完成的任务！
  • 我将 Jtextfield 更改为 Jformattedtextfield 并将格式添加为 (##-##-##-##-##)。如果我在该字段中仅输入两个值，则将输出显示为 - - - -。如果我输入所有 5 个值，则将输出显示为 55-55-55-55-55。输入时如何打印值 55-55
  • 你能建议我如何为文本字段设置值
【解决方案2】：

输入时如何打印值55-55

默认情况下，格式化文本字段只会以有效格式保存数据。要强制它保存您需要的不完整数据：

MaskFormatter format = new MaskFormatter("##-##-##-##-##");
JFormattedTextField textField = new JFormattedTextField( format );
textField.setFocusLostBehavior( JFormattedTextField.COMMIT );

【讨论】：

  • 你能建议我如何在此处为文本字段设置值
  • 我试过 textfield.setValue(value) 但没有用。如何用相同的 maskformatter 显示
  • thankyou . it worked - 然而 4 天后你不接受答案？所以您认为使用 5 个文本字段比使用一个格式化文本字段更好？how to set a value to textfield here - 您是否在字符串中包含掩码字符？ - setValue("12-34-56-78-90");
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