[Java] 생산자-소비자 문제 : wait(), notify()를 이용한 바 채우기

아무거나 빨리 눌러 바 채우기

 

import javax.swing.*;
import javax.swing.GroupLayout.Alignment;

import java.awt.*;
import java.awt.event.*;


class MyLabel extends JLabel{
	int barSize = 0; //바의 크기
	int maxBarSize;
	
	MyLabel(int maxBarSize){
		this.maxBarSize = maxBarSize;
	}
	
	public void paintComponent(Graphics g) {
		super.paintComponent(g);
		g.setColor(Color.MAGENTA);
		int width = (int)(((double)(this.getWidth()))
				/maxBarSize*barSize);
		if(width==0) {return;}
		g.fillRect(0, 0, width, this.getHeight());
		g.setColor(Color.black);
//		g.setFont(new Font("궁서", Font.BOLD, 12));
		int TextWidth = 290;
		
		if (barSize >= 10) {
			TextWidth = 285;
		} else {
			TextWidth = 290;
		}
		if (barSize == 100) {
			TextWidth = 280;
		}
		g.drawString(Integer.toString(barSize), TextWidth, 15);
	}
	
	synchronized void fill() {
		if(barSize == maxBarSize) {
			try {
				wait();
			} catch (InterruptedException e) {
				return;
			}
		}
		barSize ++;
		repaint(); //바 다시 그리기
		notify();
	}
	
	synchronized void consume() {
		if(barSize == 0) {
			try {
				wait();
			} catch (InterruptedException e) {
				return;
			}
		}
		barSize --;
		
		repaint(); //바 다시 그리기
		notify();
	}
}

class ConsumerThread extends Thread {
	MyLabel bar;
	
	ConsumerThread(MyLabel bar) {
		this.bar = bar;
	}
	public void run(){
		while(true) {
			try {
				sleep(500);
				bar.consume();
			} catch (InterruptedException e) {
				return;
			}
		}
	}
}
public class TabAndThreadEx extends JFrame {

	MyLabel bar = new MyLabel(100); 
	
	TabAndThreadEx(String title) {
		super(title);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Container c = getContentPane();
		c.setLayout(null);
		bar.setBackground(Color.ORANGE);
		bar.setOpaque(true);
		bar.setLocation(20, 50);
		bar.setSize(300, 20); 
		c.add(bar);
		
		c.addKeyListener(new KeyAdapter() {
			public void keyPressed(KeyEvent e) {
				bar.fill(); 
			}
		});
		setSize(350,200);
		setVisible(true);
		ConsumerThread th = new ConsumerThread(bar); 
		th.start(); // 스레드 시작
		c.requestFocus(); 
	}
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		new TabAndThreadEx("아무키나 빨리 눌러 바 채우기");
	}

}