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如何在Java Swing中创建带有复选框的列表?

在Java Swing中创建带有复选框的列表,可以使用DefaultListModelJList组件。以下是一个简单的示例:

代码语言:java
复制
import javax.swing.*;
import java.awt.*;

public class CheckboxList {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> createAndShowGUI());
    }

    private static void createAndShowGUI() {
        JFrame frame = new JFrame("Checkbox List");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(new Dimension(300, 200));

        DefaultListModel<String> listModel = new DefaultListModel<>();
        listModel.addElement("Item 1");
        listModel.addElement("Item 2");
        listModel.addElement("Item 3");

        JList<String> list = new JList<>(listModel);
        list.setCellRenderer(new CheckboxListCellRenderer());
        list.addMouseListener(new CheckboxListMouseAdapter(list));

        JScrollPane scrollPane = new JScrollPane(list);
        frame.add(scrollPane);

        frame.setVisible(true);
    }
}

class CheckboxListCellRenderer extends JCheckBox implements ListCellRenderer<String> {
    public CheckboxListCellRenderer() {
        setComponentOrientation(ComponentOrientation.LEFT_TO_RIGHT);
    }

    @Override
    public Component getListCellRendererComponent(JList<? extends String> list, String value, int index, boolean isSelected, boolean cellHasFocus) {
        setComponentOrientation(list.getComponentOrientation());
        setFont(list.getFont());
        setBackground(list.getBackground());
        setForeground(list.getForeground());
        setSelected(isSelected);
        setEnabled(list.isEnabled());
        setText(value);
        return this;
    }
}

class CheckboxListMouseAdapter extends MouseAdapter {
    private final JList<String> list;

    public CheckboxListMouseAdapter(JList<String> list) {
        this.list = list;
    }

    @Override
    public void mouseClicked(MouseEvent e) {
        int index = list.locationToIndex(e.getPoint());

        if (index != -1) {
            boolean isSelected = list.isSelectedIndex(index);
            list.setSelectionInterval(index, index);
            list.removeSelectionInterval(index, index);
            list.ensureIndexIsVisible(index);
        }
    }
}

在这个示例中,我们创建了一个带有复选框的列表,并添加了一些示例项目。当用户点击列表项时,复选框将被选中或取消选中。这个示例使用了CheckboxListCellRendererCheckboxListMouseAdapter来实现复选框的功能。

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