[Java] 실습 (event)

package swing.listener;

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

public class KeyListenerExam extends JFrame {
	JPanel contentPane = new JPanel();
	JLabel[] keyMessage;
	
	KeyListenerExam() {
		setTitle("KeyListener Example");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		setContentPane(contentPane);
		contentPane.addKeyListener(new MyKeyListener());
		
		keyMessage		= new JLabel[3];
		keyMessage[0]	= new JLabel(" getKeyCode() ");
		keyMessage[1]	= new JLabel(" getKeyChar() ");
		keyMessage[2]	= new JLabel(" getKeyText() ");
		
		for(int i = 0; i < keyMessage.length; i++) {
			contentPane.add(keyMessage[i]);
			keyMessage[i].setOpaque(true);	// Opaque의 값을 미리 true로 설정해 주어야 배경색이 적용된다.
			keyMessage[i].setBackground(Color.CYAN);
		}
		
		setSize(300, 150);
		setVisible(true);
		contentPane.requestFocus();
	}
	
	class MyKeyListener extends KeyAdapter {
		public void keyPressed(KeyEvent e) {
			int		keyCode	= e.getKeyCode();
			char	keyChar	= e.getKeyChar();
			keyMessage[0].setText(Integer.toString(keyCode));
			keyMessage[1].setText(Character.toString(keyChar));
			keyMessage[2].setText(e.getKeyText(keyCode));
		}
	}
	public static void main(String[] args) {
		new KeyListenerExam();

	}

}

실행 결과

package swing.listener;

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

public class ListenerMouseExam extends JFrame {
	ListenerMouseExam() {
		setTitle("버튼에 마우스 이벤트 리스너를 작성해보자.");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setLayout(new FlowLayout());
		
		JButton btn = new JButton("Mouse Event Example Button");
		btn.setBackground(Color.YELLOW);
		
		MyMouseListener listener = new MyMouseListener();
		btn.addMouseListener(listener);
		add(btn);
		
		setSize(300, 200);
		setVisible(true);
	}
	
	public static void main(String[] args) {
		new ListenerMouseExam();

	}

}

class MyMouseListener implements MouseListener {
	public void mouseEntered(MouseEvent e) 	{
		JButton btn = (JButton)e.getSource();
		btn.setBackground(Color.RED);
	}
	public void mouseExited(MouseEvent e) 	{
		JButton btn = (JButton)e.getSource();
		btn.setBackground(Color.YELLOW);
	}
	public void mousePressed(MouseEvent e) 	{}
	public void mouseReleased(MouseEvent e) {}
	public void mouseClicked(MouseEvent e) 	{}
}

실행 결과

package swing.listener;

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

public class MouseListenerExam extends JFrame {
JLabel la;
	
	MouseListenerExam() {
		setTitle("Mouse Event 연습");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		JPanel contentPane = new JPanel();
		setContentPane(contentPane);
		setLayout(null);
		
		contentPane.addMouseListener(new MyMouseListener());
		
		la = new JLabel("Hello");
		la.setSize(50, 20);
		la.setLocation(20, 20);
		contentPane.add(la);
		
		setSize(800, 600);
		setVisible(true);
	}
	
	class MyMouseListener extends MouseAdapter {
		public void mousePressed(MouseEvent e) {
			int x = e.getX();	// 마우스를 누른 곳의 좌표값을 가져온다.
			int y = e.getY();
			
			la.setLocation(x, y);	// 라벨을 이동시킨다.
		}
	}
	/*
	class MyMouseListener implements MouseListener {
		public void mousePressed(MouseEvent e) {
			int x = e.getX();	// 마우스를 누른 곳의 좌표값을 가져온다.
			int y = e.getY();
			
			la.setLocation(x, y);	// 라벨을 이동시킨다.
		}
		public void mouseReleased(MouseEvent e)	{}
		public void mouseClicked(MouseEvent e) 	{}
		public void mouseEntered(MouseEvent e) 	{}
		public void mouseExited(MouseEvent e) 	{}
	}
	*/
	public static void main(String[] args) {
		new MouseListenerExam();

	}

}

실행 결과