【问题标题】:Use one JComboBox to control another Jcombo Box使用一个 JComboBox 控制另一个 Jcombobox
【发布时间】:2017-04-25 06:08:45
【问题描述】:

我希望一个JComboBox 的值根据另一个JComboBox 的值而改变。在一个JComboBox 中,我显示了我从数据库中检索到的医生名称。根据该名称,我想在另一个 JComboBox 中显示医生的姓名。所有信息都存储在医生表中。

【问题讨论】:

    标签: java sqlite jcombobox populate


    【解决方案1】:

    ActionListener 添加到第一个组合框。在侦听器中,您需要根据所选项目重置第二个组合框的ComboBoxModel

    类似:

    import java.awt.*;
    import java.awt.event.*;
    import java.util.*;
    import javax.swing.*;
    import javax.swing.plaf.basic.*;
    
    public class ComboBoxTwo extends JPanel implements ActionListener
    {
        private JComboBox<String> mainComboBox;
        private JComboBox<String> subComboBox;
        private Hashtable<String, String[]> subItems = new Hashtable<String, String[]>();
    
        public ComboBoxTwo()
        {
            String[] items = { "Select Item", "Color", "Shape", "Fruit" };
            mainComboBox = new JComboBox<String>( items );
            mainComboBox.addActionListener( this );
    
            //  prevent action events from being fired when the up/down arrow keys are used
            mainComboBox.putClientProperty("JComboBox.isTableCellEditor", Boolean.TRUE);
            add( mainComboBox );
    
            //  Create sub combo box with multiple models
    
            subComboBox = new JComboBox<String>();
            subComboBox.setPrototypeDisplayValue("XXXXXXXXXX"); // JDK1.4
            add( subComboBox );
    
            JButton arrow = SwingUtils.getDescendantOfType(JButton.class, subComboBox, "Text", "");
            Dimension d = arrow.getPreferredSize();
            System.out.println(arrow.getClass());
            System.out.println(d);
            d.width = 100;
            arrow.setPreferredSize(d);
    
            String[] subItems1 = { "Select Color", "Red", "Blue", "Green" };
            subItems.put(items[1], subItems1);
    
            String[] subItems2 = { "Select Shape", "Circle", "Square", "Triangle" };
            subItems.put(items[2], subItems2);
    
            String[] subItems3 = { "Select Fruit", "Apple", "Orange", "Banana" };
            subItems.put(items[3], subItems3);
        }
    
        public void actionPerformed(ActionEvent e)
        {
            String item = (String)mainComboBox.getSelectedItem();
            Object o = subItems.get( item );
    
            if (o == null)
            {
                subComboBox.setModel( new DefaultComboBoxModel() );
            }
            else
            {
                subComboBox.setModel( new DefaultComboBoxModel( (String[])o ) );
            }
        }
    
        private static void createAndShowUI()
        {
            try
            {
    //          UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
            }
            catch (Exception e) { }
            JFrame frame = new JFrame("SSCCE");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.add( new ComboBoxTwo() );
            frame.setLocationByPlatform( true );
            frame.pack();
            frame.setVisible( true );
        }
    
        public static void main(String[] args)
        {
            EventQueue.invokeLater(new Runnable()
            {
                public void run()
                {
                    createAndShowUI();
                }
            });
        }
    }
    

    【讨论】:

      【解决方案2】:

      您需要为一个 jcombobox1 构建侦听器,然后您需要处理 jcombobox2。

      【讨论】:

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