명품자바 programming 13장 실습문제

2번 3번 스레드가 동작을 안 해서 디버깅 돌리고 난리를 쳤는데

스레드 run() 안에 while문을 안 넣어줬던 거였다....

Aㅏ

1.

import java.util.Scanner;
 
public class Ex01 {
	
	public Ex01() {
		Scanner scanner = new Scanner(System.in);
		System.out.print("아무거나 입력");
		scanner.nextLine();
		scanner.close();
		
		Thread th = new Thread(new PrintThread());
		th.start();
	}
	
	class PrintThread implements Runnable{
		@Override
		public void run() {
			for (int i=0; i<10; i++) {
				System.out.print(i+1 + " ");
			}
			System.out.println("\n스레드 종료");
		}
	}
	
	public static void main(String[] args) {
		new Ex01();
	}
 
}

 

2.

import java.awt.Color;
import java.awt.Component;
import java.awt.Container;
import java.awt.Graphics;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
 
import javax.swing.JFrame;
import javax.swing.JPanel;
 
public class Ex02 extends JFrame{
	
	private MyPanel panel = new MyPanel();
	
	public Ex02() {
		super("원을 0.5초 간격으로 이동");
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setContentPane(panel);
		setSize(300,300);
		setVisible(true);
		
		Container c = getContentPane();
		
		MyThread th = new MyThread(panel);
		
		c.addMouseListener(new MouseAdapter() {
			public void mouseClicked(MouseEvent e) {
				th.start();
			}
		});
		
		setFocusable(true);
		requestFocus();
	}
	
	class MyPanel extends JPanel{
		@Override
		public void paintComponent(Graphics g) {
			super.paintComponent(g);
			g.setColor(Color.MAGENTA);
			int x = (int)(Math.random()*300);
			int y = (int)(Math.random()*300);
			g.drawOval(x, y, 50, 50);
		}
	}
	
	class MyThread extends Thread{
		private MyPanel panel;
		
		public MyThread(MyPanel panel) {
			this.panel = panel;
		}
		
		@Override
		public void run() {
			while(true) {
				panel.repaint();
				try {
					sleep(400);
				} catch (InterruptedException e) {
					return;
				}
			}
		}
		
	}
 
	public static void main(String[] args) {
		new Ex02();
	}
 
}

 

3.

import java.awt.Container;
import java.awt.Font;
import java.util.Calendar;
 
import javax.swing.JFrame;
import javax.swing.JLabel;
 
public class Ex03 extends JFrame {
	private JLabel label = new JLabel("");
	
	public Ex03() {
		super("디지털 시계 만들기");
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		
		Container c = getContentPane();
		
		label.setFont(new Font("Gothic", Font.ITALIC, 100));
		c.add(label);
		
		TimerThread th = new TimerThread(label);
		th.start();
		
		setSize(400,200);
		setVisible(true);
	}
	
	class TimerThread extends Thread{
		
		private JLabel label = null;
		
		public TimerThread(JLabel label) {
			this.label = label;
		}
		
		public String getNowTime() {
			Calendar c = Calendar.getInstance();
			int hour = c.get(Calendar.HOUR_OF_DAY);
			int min = c.get(Calendar.MINUTE);
			int second = c.get(Calendar.SECOND);
			
			String ClockText = Integer.toString(hour);
			ClockText = ClockText.concat(":");
			ClockText = ClockText.concat(Integer.toString(min));
			ClockText = ClockText.concat(":");
			ClockText = ClockText.concat(Integer.toString(second));
			
			return ClockText;
		}
		
		@Override
		public void run() {
			while(true) {
				label.setText(getNowTime());
				try {
					sleep(1000);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
			}
		}
	}
 
	public static void main(String[] args) {
		new Ex03();
	}
 
}

 

4.(1)

import java.awt.Color;
import java.awt.Container;
import java.awt.Font;
 
import javax.swing.JFrame;
import javax.swing.JLabel;
 
public class Ex04 extends JFrame {
	
	public Ex04() {
		super("진동하는 프레임 만들기");
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		
		VibThread th = new VibThread(this);
		th.start();
		
		setSize(500,500);
		setVisible(true);
	}
	
	class VibThread extends Thread{
		private JFrame f = null;
		private int x = 500;
		public VibThread(JFrame f){
			this.f = f;
		}
		
		@Override
		public void run() {
			while(true) {			
				if (x == 500) x += 5;
				else x -= 5;
				
				f.setLocation(x,x);
			}
		}
	}
	
	public static void main(String[] args) {
		new Ex04();
	}
 
}

 

4.(2)

import java.awt.Color;
import java.awt.Container;
import java.awt.Font;
 
import javax.swing.JFrame;
import javax.swing.JLabel;
 
public class Ex04 extends JFrame {
	
	public Ex04() {
		super("진동하는 프레임 만들기");
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		
		Container c = getContentPane();
		
		JLabel label = new JLabel("진동 레이블");
		label.setFont(new Font("Gothic", Font.ITALIC, 50));
		c.add(label);
		label.setLocation(50,50);
		
		VibThread th = new VibThread(label);
		th.start();
		
		setSize(500,500);
		setVisible(true);
	}
	
	class VibThread extends Thread{
		private JLabel label = null;
		
		public VibThread(JLabel label){
			this.label = label;
		}
		
		@Override
		public void run() {
			while(true) {			
				int x = label.getX();
				
				if (x == 50) x += 5;
				else x -= 5;
				
				label.setLocation(x,x);
			}
		}
	}
	
	public static void main(String[] args) {
		new Ex04();
	}
 
}