java - 通过将参数作为组件名称返回 JTable 的函数

Question

public JTable getTable(String Component_name)
    {
        JTable table=new JTable();
    //in this function i want to search all the JTables that have been created on runtime! 
    //and then i want to return one JTable by the name "Component_Name"//

        return table;
    }

这就是我想要的功能；我想出了一个解决方案，即创建一个具有私有(private) JTable 表和私有(private)字符串名称的新组件类，但在按名称搜索 JTables 时仍然出现问题。

Answer 1

结合@Alican Ozgoren、@mKorbel 和 answer 的建议, 你可以构造一个 Map<String, NamedModel>快速访问 TableModel按名字。

public TableModel getTable(String name) {
    return map.get(name);
}

下面的例子替换了单个 JTable的模型, 而另一个 example显示多个表。

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.HashMap;
import java.util.Map;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableModel;

/**
 * @see https://stackoverflow.com/a/16611982/230513
 * @see https://stackoverflow.com/a/10623134/230513
 */
public class Test {

    private static final int N = 25;
    private DefaultComboBoxModel dcbm = new DefaultComboBoxModel();
    private JComboBox combo = new JComboBox(dcbm);
    private JTable table = new JTable(1, 1);
    private Map<String, NamedModel> map = new HashMap<String, NamedModel>();

    public TableModel getTable(String name) {
        return map.get(name);
    }

    private void display() {
        JFrame f = new JFrame("Test");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        for (int i = 0; i < N; i++) {
            String name = "Table " + String.valueOf(i);
            NamedModel model = new NamedModel(name);
            map.put(name, model);
            dcbm.addElement(model);
        }
        combo.setSelectedIndex(-1);
        combo.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                TableModel model = (TableModel) combo.getSelectedItem();
                table.setModel(model);
            }
        });
        f.add(combo, BorderLayout.NORTH);
        f.add(table);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    private static class NamedModel extends DefaultTableModel {

        private String name;

        public NamedModel(String name) {
            super(1, 1);
            this.name = name;
        }

        @Override
        public Object getValueAt(int row, int col) {
            return name + ", " + row + ", " + col;
        }

        @Override
        public String toString() {
            return name;
        }
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                new Test().display();
            }
        });
    }
}