Main.java Source code

Introduction

Here is the source code for Main.java

Source

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Vector;

import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.plaf.basic.BasicComboBoxRenderer;

public class Main extends JFrame implements ActionListener {
    public Main() {
        Vector model = new Vector();
        model.addElement(new Item(1, "A"));
        model.addElement(new Item(2, "B"));
        model.addElement(new Item(3, "C"));
        model.addElement(new Item(4, "D"));

        JComboBox comboBox = new JComboBox(model);
        comboBox.addActionListener(this);
        comboBox.putClientProperty("JComboBox.isTableCellEditor", Boolean.TRUE);
        getContentPane().add(comboBox, BorderLayout.NORTH);

        comboBox = new JComboBox(model);
        comboBox.setRenderer(new ItemRenderer());
        comboBox.addActionListener(this);
        getContentPane().add(comboBox, BorderLayout.SOUTH);
    }

    public void actionPerformed(ActionEvent e) {
        JComboBox comboBox = (JComboBox) e.getSource();
        Item item = (Item) comboBox.getSelectedItem();
        System.out.println(item.getId() + " : " + item.getDescription());
    }

    public static void main(String[] args) {
        JFrame frame = new Main();
        frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
    }

}

class ItemRenderer extends BasicComboBoxRenderer {
    public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected,
            boolean cellHasFocus) {
        super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);

        if (value != null) {
            Item item = (Item) value;
            setText(item.getDescription().toUpperCase());
        }

        if (index == -1) {
            Item item = (Item) value;
            setText("" + item.getId());
        }

        return this;
    }
}

class Item {
    private int id;
    private String description;

    public Item(int id, String description) {
        this.id = id;
        this.description = description;
    }

    public int getId() {
        return id;
    }

    public String getDescription() {
        return description;
    }

    public String toString() {
        return description;
    }
}