如何在此代码中为每个文本字段和标签命名？ JAVA

Question

below I have pasted my java code which I need a bit help with. How would I refer to each individual textbox and label? eg I have created a code that loops through the array list and create appropriate amount of labels and textfields in my case below it creates 3 of each. The problem I am having is, how would I refer to each of these components? for example, if i want to get the value of my second textbox how would I do that? is there any way to give each textbox and textfield a name. eg say first label name is label1, second is label2 and so on and first textbox name is field1, second box name is field2 and so on.

Answer 1

Retrieve them from the Map with their associated key.

String textOfFirst = fieldMap.get("Text1").getText();
fieldMap.get("Text2").setEnabled(false);

But as my opinion, it seems like with this kind of group creation you should have it set up so you don't need to refer to them individually.

Answer 2

Here's an example you can run. I used a Map as you were trying to do. There may be a lot of code, but what your interested in is this

Map<String, JTextField> fields;
....
JTextField field = new JTextField(15);
fields.put(fieldName, field);
....
public class ButtonListener implements ActionListener {
    @Override
    public void actionPerformed(ActionEvent e) {
        JButton button = (JButton)e.getSource();
        String fieldName = button.getText();
        JTextField field = fields.get(fieldName);
        System.out.println(field.getText());
    }
}

I just put the JTextField in a Map . When I want to access it, I just use JTextField field = fields.get("textfield name");

In the example below, just type in something to the field, then click the button next to it. You will see that the button has the same name as the text field key in the map, so I just use that to print the value in the text field

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.HashMap;
import java.util.Map;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class Test2 {

    Map<String, JTextField> fields;
    Map<String, JLabel> labels;

    public Test2() {
        fields = new HashMap<>();
        labels = new HashMap<>();

        JPanel mainPanel = new JPanel(new GridLayout(10, 1));
        for (int i = 1; i <= 10; i++) {
            JPanel panel = createPanel("Text Field " + i);
            mainPanel.add(panel);
        }

        JFrame frame = new JFrame("Test");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(mainPanel);
        frame.pack();
        frame.setVisible(true);

    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable(){
            public void run() {
                new Test2();
            }
        });
    }

    private JPanel createPanel(String fieldName) {
        JPanel panel = new JPanel();
        JTextField field = new JTextField(15);
        field.addActionListener(new FieldListener());
        fields.put(fieldName, field);

        JLabel label = new JLabel(fieldName);
        label.addMouseListener(new MouseHandler());
        labels.put(fieldName, label);

        JButton button = new JButton(fieldName);
        button.addActionListener(new ButtonListener());

        panel.add(label);
        panel.add(field);
        panel.add(button);

        return panel;
    }

    public class ButtonListener implements ActionListener {
        @Override
        public void actionPerformed(ActionEvent e) {
            JButton button = (JButton)e.getSource();
            String fieldName = button.getText();
            JTextField field = fields.get(fieldName);
            System.out.println(field.getText());
        }
    }

    public class FieldListener implements ActionListener {
        @Override
        public void actionPerformed(ActionEvent e) {
            JTextField field = (JTextField)e.getSource();
            System.out.println(field.getText());
        }
    }

    public class MouseHandler extends MouseAdapter {
        @Override
        public void mouseClicked(MouseEvent e) {
            JLabel label = (JLabel)e.getSource();
            System.out.println(label.getText());
        }
    }
}