Question

我想在点击按钮时动态添加文本字段但是要获取的值和按钮在一个类中，我想要添加文本框和滑块的面板位于不同的类中。代码是 -

public class TipSplitting extends JPanel 

JLabel lblNoOfGuests = new JLabel("No. Of guests");
    lblNoOfGuests.setBounds(10, 26, 95, 14);
    add(lblNoOfGuests);

private JTextField noofguests = new JTextField();
    noofguests.setBounds(179, 23, 86, 20);
    add(noofguests);
    noofguests.setColumns(10);
JButton btnTiptailoring = new JButton("TipTailoring");
    btnTiptailoring.setBounds(117, 286, 89, 23);
    add(btnTiptailoring);

public class TipTailoring extends JPanel {}

在这个课程中，我需要根据编号动态创建文本字段。进入。在变量noofguests中，单击上一个类中的按钮。

Answer 1

我无法真正看到问题所在，但这里有一些您所描述的简单演示代码。

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class TestDynamicallyAddedTextFields {

    private void initUI() {
        JFrame frame = new JFrame(TestDynamicallyAddedTextFields.class.getSimpleName());
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        final JPanel textfieldContainerPanel = new JPanel();
        textfieldContainerPanel.setLayout(new GridBagLayout());
        JLabel nrOfGuests = new JLabel("Nr. of guests");
        final JFormattedTextField textfield = new JFormattedTextField();
        textfield.setValue(Integer.valueOf(1));
        textfield.setColumns(10);
        JButton add = new JButton("Add");
        add.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                if (textfield.getValue() != null) {
                    addTextFieldsToPanel((Integer) textfield.getValue(), textfieldContainerPanel);
                }
            }
        });
        JPanel panel = new JPanel(new FlowLayout(FlowLayout.LEADING));
        panel.add(nrOfGuests);
        panel.add(textfield);
        panel.add(add);
        frame.add(panel, BorderLayout.NORTH);
        frame.add(new JScrollPane(textfieldContainerPanel));
        frame.setSize(300, 600);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }

    protected void addTextFieldsToPanel(Integer value, JPanel textfieldContainerPanel) {
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridwidth = GridBagConstraints.REMAINDER;
        gbc.gridheight = 1;
        for (int i = 0; i < value; i++) {
            textfieldContainerPanel.add(new JTextField(20), gbc);
        }
        textfieldContainerPanel.revalidate();
        textfieldContainerPanel.repaint();
    }

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

            @Override
            public void run() {
                new TestDynamicallyAddedTextFields().initUI();
            }
        });
    }

}

结果：

Result image

从其他类动态添加文本框和JSlider

1 个答案: