java 在循环中动态创建 JTextField

Create JTextField dynamically in a loop

提问by saidozcan

I am beginner on Java GUI. I am writing a program that calculates the inverse of the given matrix. To do this, first i have to scan matrix. I decided to scan matrix by this way:

我是 Java GUI 的初学者。我正在编写一个程序来计算给定矩阵的逆。为此，首先我必须扫描矩阵。我决定通过这种方式扫描矩阵：

First i am asking user the count of row or column of square matrix. When user enters a number and clicks Tamambutton i want to create little NxN JTextField's.

首先，我问用户方阵的行数或列数。当用户输入一个数字并点击Tamam按钮时，我想创建小 NxNJTextField的。

So user will be able to enter each element of matrix easily. What i want to ask is this: I am unable to create NxN JTextField's. My code:

因此用户将能够轻松输入矩阵的每个元素。我想问的是：我无法创建 NxN JTextField。我的代码：

private void jButtonRowCntMouseClicked(java.awt.event.MouseEvent evt) {                                           
        int i,j;
        if(jTextFieldRowCnt.getText() != null){
            String cnt = jTextFieldRowCnt.getText();
            Integer rowCnt = Integer.parseInt(cnt);                      
            for(i=0;i<rowCnt;i++){
                for(j=0;j<rowCnt;j++){
                      JTextField textField = new JTextField();
                      this.add(textField);
                      pack();
                }
            }
        }
    } 

But unfortunately, I could not make it. Where am I going wrong?

但不幸的是，我无法做到。我哪里错了？

My another question is that, how can I set locations of NxN JTextFields?

我的另一个问题是，如何设置 NxNJTextField的位置？

回答by Sanjaya Liyanage

import java.awt.Dimension;
    import java.awt.GridBagConstraints;
    import java.awt.GridBagLayout;
    import java.awt.Insets;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.util.ArrayList;
    import java.util.List;
    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    import javax.swing.JPanel;
    import javax.swing.JTextField;
    import javax.swing.border.LineBorder;

    public class Test 
    {
        // Field members
        static JPanel panel = new JPanel();
        static Integer indexer = 1;
        static List<JTextField> listOfTextFields = new ArrayList<JTextField>();

        public static void main(String[] args)
        {       
            // Construct frame
            JFrame frame = new JFrame();
            frame.setLayout(new GridBagLayout());
            frame.setPreferredSize(new Dimension(990, 990));
            frame.setTitle("My Example");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

            // Frame constraints
            GridBagConstraints frameConstraints = new GridBagConstraints();

            // Construct button
            JButton addButton = new JButton("test");
            addButton.addActionListener(new ButtonListener());

            // Add button to frame
            frameConstraints.gridx = 0;
            frameConstraints.gridy = 0;
            frame.add(addButton, frameConstraints);

            // Construct panel
            panel.setPreferredSize(new Dimension(600, 600));
            panel.setLayout(new GridBagLayout());
            panel.setBorder(LineBorder.createBlackLineBorder());

            // Add panel to frame
            frameConstraints.gridx = 0;
            frameConstraints.gridy = 1;
            frameConstraints.weighty = 1;
            frame.add(panel, frameConstraints);

            // Pack frame
            frame.pack();

            // Make frame visible
            frame.setVisible(true);
        }

        static class ButtonListener implements ActionListener
        {
            @Override
            public void actionPerformed(ActionEvent arg0) 
            {       

                panel.removeAll();
                GridBagConstraints textFieldConstraints = new GridBagConstraints();

                int rowCnt=4,i,j;

                for(i=0;i<rowCnt;i++){
                    for(j=0;j<rowCnt;j++){
                        JTextField g=new JTextField();
                        g.setText("7");
                        textFieldConstraints.gridx = i;
                        textFieldConstraints.fill = GridBagConstraints.HORIZONTAL;
                        textFieldConstraints.weightx = 0.5;
                        textFieldConstraints.insets = new Insets(10, 10, 10, 10);
                        textFieldConstraints.gridy = j;
                        panel.add(g, textFieldConstraints);
                    }
                }

                panel.updateUI();
            }


        }
    }

try this and get what you want

试试这个，得到你想要的

回答by polypiel

What is the concrete problem? What is class of the object? It seems a problem with the layout of the container component.

具体问题是什么？什么是对象的类？好像是容器组件的布局有问题。

I'd recommend you to add the matrix text fields into a dedicated JPanelwith a GridLayout.

我建议您将矩阵文本字段添加到JPanel带有GridLayout.

Example:

例子：

    // ...
    matrixPanel.setLayout(new GridLayout(rowCnt, rowCnt)); // matrixPanel is the dedicated JPanel
    for(i=0;i<rowCnt;i++){
        for(j=0;j<rowCnt;j++){
              JTextField textField = new JTextField();
              matrixPanel.add(textField); // add the fields into the panel
              //pack(); I think it wouldn't be needed
        }
    }

More information about GridPanel in http://docs.oracle.com/javase/tutorial/uiswing/layout/grid.html

有关 GridPanel 的更多信息，请访问http://docs.oracle.com/javase/tutorial/uiswing/layout/grid.html