java复选框三级联动怎么写？

Java复选框三级联动可以通过监听器和递归实现。以下是一个简单的示例代码，供参考：

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

public class CheckboxTest extends JFrame {

    private JCheckBox[] provinceCheckbox = { new JCheckBox("江苏"), new JCheckBox("浙江"), new JCheckBox("上海") };
    private JCheckBox[][] cityCheckbox = {
            { new JCheckBox("南京"), new JCheckBox("苏州"), new JCheckBox("无锡") },
            { new JCheckBox("杭州"), new JCheckBox("宁波"), new JCheckBox("温州") },
            { new JCheckBox("上海市") }
    };
    private JCheckBox[][][] districtCheckbox = {
            {
                { new JCheckBox("玄武区"), new JCheckBox("秦淮区"), new JCheckBox("建邺区") },
                { new JCheckBox("常熟市"), new JCheckBox("张家港市"), new JCheckBox("昆山市") },
                { new JCheckBox("惠山区"), new JCheckBox("锡山区"), new JCheckBox("滨湖区") }
            },
            {
                { new JCheckBox("西湖区"), new JCheckBox("江干区"), new JCheckBox("下城区") },
                { new JCheckBox("江北区"), new JCheckBox("海曙区"), new JCheckBox("鄞州区") },
                { new JCheckBox("鹿城区"), new JCheckBox("龙湾区"), new JCheckBox("瓯海区") }
            },
            {
                { new JCheckBox("黄浦区"), new JCheckBox("徐汇区"), new JCheckBox("长宁区") }
            }
    };

    public CheckboxTest() {
        JPanel panel = new JPanel(new GridLayout(0, 2));
        for (JCheckBox checkBox : provinceCheckbox) {
            panel.add(checkBox);
            checkBox.addItemListener(new CheckboxListener(cityCheckbox[getIndex(provinceCheckbox, checkBox)]));
        }
        add(panel);
        setSize(400, 150);
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    private int getIndex(Object[] array, Object object) {
        for (int i = 0; i < array.length; i++) {
            if (array[i] == object) {
                return i;
            }
        }
        return -1;
    }

    private class CheckboxListener implements ItemListener {

        private JCheckBox[] cityCheckbox;

        public CheckboxListener(JCheckBox[] cityCheckbox) {
            this.cityCheckbox = cityCheckbox;
        }

        @Override
        public void itemStateChanged(ItemEvent e) {
            if (e.getStateChange() == ItemEvent.SELECTED) {
                JPanel panel = (JPanel) getContentPane().getComponent(0);
                for (JCheckBox checkBox : cityCheckbox) {
                    panel.add(checkBox);
                    checkBox.addItemListener(new CheckboxListener2(districtCheckbox[getIndex(provinceCheckbox, e.getItem())][getIndex(cityCheckbox, checkBox)]));
                }
                revalidate();
                repaint();
            } else {
                JPanel panel = (JPanel) getContentPane().getComponent(0);
                for (JCheckBox checkBox : cityCheckbox) {
                    panel.remove(checkBox);
                }
                revalidate();
                repaint();
            }
        }
    }

    private class CheckboxListener2 implements ItemListener {

        private JCheckBox[] districtCheckbox;

        public CheckboxListener2(JCheckBox[] districtCheckbox) {
            this.districtCheckbox = districtCheckbox;
        }

        @Override
        public void itemStateChanged(ItemEvent e) {
            if (e.getStateChange() == ItemEvent.SELECTED) {
                JPanel panel = (JPanel) getContentPane().getComponent(0);
                for (JCheckBox checkBox : districtCheckbox) {
                    panel.add(checkBox);
                }
                revalidate();
                repaint();
            } else {
                JPanel panel = (JPanel) getContentPane().getComponent(0);
                for (JCheckBox checkBox : districtCheckbox) {
                    panel.remove(checkBox);
                }
                revalidate();
                repaint();
            }
        }
    }

    public static void main(String[] args) {
        new CheckboxTest();
    }
}

在这个示例中，我们创建了三个省份复选框，每个省份下面有若干个城市复选框，每个城市下面有若干个区县复选框。当选择一个省份时，该省份下面的城市复选框会出现，当选择一个城市时，该城市下面的区县复选框会出现。整个过程是通过监听器实现的，当复选框状态改变时，监听器会相应地增加或删除与之关联的复选框。