# 52 - 람다식

package ja_0816;

import java.awt.Color;
import java.awt.Graphics;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class Ball_1 extends JPanel {

	static final int BOARD_WIDTH = 600;
	static final int BOARD_HEIGHT = 300;

	private Ball ball = new Ball();
	private Ball2 ball2 = new Ball2();

	public Ball_1() {

		this.setBackground(Color.yellow);
		Runnable task = () -> {
			while (true) {
				ball.update();
				ball2.update();

//				람다식을 이용하여서 Runnable 객체를 생성한다
//				무한루프를 돌면서 공의 위치를 변경하고 화면에 다시 그린다. 
//				50밀리초 동안 쉰다.

				repaint();
				try {
					Thread.sleep(50);
				} catch (InterruptedException ignore) {

				}

			}

		};

		new Thread(task).start();

	}

	public void paintComponent(Graphics g) {
		super.paintComponent(g);
		ball.draw(g);
		ball2.draw(g);
	}

	public static void main(String[] args) {
		JFrame frame = new JFrame();
		frame.setSize(Ball_1.BOARD_WIDTH, Ball_1.BOARD_HEIGHT);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
		frame.add(new Ball_1());

	}

}

class Ball {

	// 공의 속성은 위치, 크기, 속도 이다.
	private int x = 100;
	private int y = 100;
	private int size = 30;
	private int xSpeed = 10;
	private int ySpeed = 10;

	public void draw(Graphics g) {
		g.setColor(Color.red);
		g.fillOval(x, y, size, size);
	}

	public void update() {
		x += xSpeed;
		y += ySpeed;

		if ((x + size) > Ball_1.BOARD_WIDTH - size || x < 0) {
			xSpeed = -xSpeed;
		}

		if ((y + size) > Ball_1.BOARD_HEIGHT - (size + 15) || y < 0) {
			ySpeed = -ySpeed;
		}

	}

}

class Ball2 {

	private int x = 250;
	private int y = 170;
	private int size = 20;
	private int xSpeed = 15;
	private int ySpeed = 8;

	// 공을 화면에 그려주는 메소드

	public void draw(Graphics g) {
		g.setColor(Color.green);
		g.fillOval(x, y, size, size);
	}

	public void update() {
		x += xSpeed;
		y += ySpeed;

		if ((x + size) > Ball_1.BOARD_WIDTH - size || x < 0) {
			xSpeed = -xSpeed;
		}

		if ((y + size) > Ball_1.BOARD_HEIGHT - (size + 10) || y < 0) { //+원의 반지름 해줌
			ySpeed = -ySpeed;
		}

	}

}

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

package ja_0816;

import java.awt.Color;

import javax.swing.BorderFactory;
import javax.swing.JColorChooser;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

public class ColorChoose_1 extends JFrame implements ChangeListener {

	protected JColorChooser color;

	public ColorChoose_1() {
		setTitle("색상선택 테스트");
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		color = new JColorChooser(); // 생성자 호출
		color.getSelectionModel().addChangeListener(this);
		color.setBorder(BorderFactory.createTitledBorder("색상 선택"));

		JPanel panel = new JPanel();

		panel.add(color);
		add(panel);

		pack();
		this.setVisible(true);

	}

	@Override
	public void stateChanged(ChangeEvent e) {
		Color newColor = color.getColor();
		System.out.println(newColor);

	}

	public static void main(String[] args) {
		new ColorChoose_1();
	}

}