KeyListener

package Package;

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

public class MykeyListener extends JFrame implements KeyListener{
	private JPanel panel1;
	private JTextField field;
	private JTextArea area;
	
	public MykeyListener() {
		panel1 = new JPanel(new GridLayout(0, 2));
		panel1.add(new JLabel("문자를 입력하시오."));
		field = new JTextField(10);
		panel1.add(field);
		area = new JTextArea(3, 30);
		
		this.add(panel1, BorderLayout.NORTH);
		this.add(area, BorderLayout.CENTER);
		field.addKeyListener(this);
		this.getDefaultCloseOperation();
		this.setTitle("KeyEvent");
		this.setSize(400, 200);
		this.setVisible(true);
	}
	public static void main(String[] args) {
		new MykeyListener();

	}

	private void display(KeyEvent e, String s) {
		char c = e.getKeyChar();
		int KeyCode = e.getKeyCode();
		String modifiers = "Alt: " + e.isAltDown() +
				"Ctrl: " + e.isControlDown() + "Shift: " +
				e.isShiftDown();
		
		area.append("" + s + "문자 " + c + "(코드: " + KeyCode +
				") " + modifiers + "\n");
		
	}
	@Override
	public void keyPressed(KeyEvent e) {
		// Key를 눌러졌을 때. // 대개 이것만 사용한다.
		display(e, "Key keyPressed     ");
		
	}

	@Override
	public void keyReleased(KeyEvent e) {
		// Key에서 손을 떼었을 때.
		display(e, "Key keyReleased     ");
		
	}

	@Override
	public void keyTyped(KeyEvent e) {
		// 사용자가 글자를 입력하였을 때.
		display(e, "Key keyTyped       ");
		
		
	}

}