JComboBox, Action 이벤트를 이용한 콤보박스 활용

JComboBox 연습 코드

import javax.swing.*; // JFrame
import java.awt.*; // Container
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.util.Vector;
import java.awt.*;

public class ComboBoxEx extends JFrame{

	private String[] fruits= {"apple","banana","kiwi","mango","pear",
			"peach","berry","strawberry","blackberry"};
	private String[] names= {"kitae","jaemoon","hyosoo","namyun"};
	
	ComboBoxEx(){
		setTitle("11장 연습");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Container c = getContentPane();
		c.setLayout(new FlowLayout());
	
		JComboBox<String> strCombo=new JComboBox<String>(fruits);
		
		c.add(strCombo);
		
		JComboBox<String> nameCombo = new JComboBox<String>();
		for(int i=0;i<names.length;i++) {
			nameCombo.addItem(names[i]);
		}
		
		c.add(nameCombo);
		
		setSize(300, 300); // 프레임 크기 300x300
		setVisible(true); // 프레임 출력
		
		c.setFocusable(true);
		c.requestFocus();
	}
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		new ComboBoxEx();
	}

}

 

Action 이벤트를 이용한 콤보박스 활용 예

import javax.swing.*; // JFrame
import java.awt.*; // Container
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.util.Vector;
import java.awt.*;

public class ComboBoxEx extends JFrame{

	private String[] fruits= {"apple","bear","cherry"};
	private ImageIcon[] images= {
			new ImageIcon("C:\\Temp/apple.jpg"),
			new ImageIcon("C:\\Temp/bear.jpg"),
			new ImageIcon("C:\\Temp/cherry.png")
	};
	private JLabel imgLabel = new JLabel(images[0]);
	private JComboBox<String> strCombo=new JComboBox<String>(fruits);
	
	ComboBoxEx(){
		setTitle("11장 연습");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Container c = getContentPane();
		c.setLayout(new FlowLayout());
	
		c.add(strCombo);
		c.add(imgLabel);
		
		strCombo.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				JComboBox<String> cb=(JComboBox<String>)e.getSource();
				int index=cb.getSelectedIndex();
				imgLabel.setIcon(images[index]);
			}
		});
		
		setSize(300, 300); // 프레임 크기 300x300
		setVisible(true); // 프레임 출력
		
		c.setFocusable(true);
		c.requestFocus();
	}
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		new ComboBoxEx();
	}

}