20110701 Java練習小記

import java.applet.Applet;
import java.awt.Graphics;
import java.awt.Color;
import java.awt.Font;


public class Chapter16Homework1 extends Applet
{
public void paint(Graphics g)
{
g.setColor(Color.blue);
g.setFont(new Font("serif", Font.BOLD, 20));
g.drawString("Hello", 20,20);
}

}

import java.applet.Applet;

import java.awt.Graphics;

public class Chapter16Homework2 extends Applet

{

public void paint(Graphics g)

{

g.fillRect(10, 10, 100, 100);

}

}

import java.applet.Applet;

import java.awt.Graphics;

import java.awt.Image;

import java.awt.event.MouseListener;

import java.awt.event.MouseEvent;

public class Chapter16Homework3 extends Applet implements MouseListener

{

Image img;

int x = 10;

int y = 10;

public void init()

{

addMouseListener(this);

img = getImage(getDocumentBase(), "Image.gif");

}

public void mouseClicked(MouseEvent e){}

public void mouseEntered(MouseEvent e){}

public void mouseExited(MouseEvent e){}

public void mousePressed(MouseEvent e)

{

x = e.getX();

y = e.getY();

repaint();

}

public void mouseReleased(MouseEvent e){}

public void paint(Graphics g)

{

g.drawImage(img, x, y, this);

}

}

import java.applet.Applet;

import java.awt.Graphics;

public class Chapter16Homework5 extends Applet implements Runnable

{

int num;

int x;

public void init()

{

Thread th;

th = new Thread(this);

th.start();

}

public void run()

{

try{

for(int i=0; i < 10; i++)

{

num = i;

x = i * 10;

repaint();

Thread.sleep(1000);

}

}

catch(InterruptedException e)

{

}

}

public void paint(Graphics g)

{

String str = "是" + num;

g.drawString(str, x, 10);

}

}

import java.applet.Applet;

import java.awt.Graphics;

public class Chapter16Homework5 extends Applet implements Runnable

{

int num;

int x;

public void init()

{

Thread th;

th = new Thread(this);

th.start();

}

public void run()

{

try{

for(int i=0; i < 10; i++)

{

num = i;

x = i * 10;

repaint();

Thread.sleep(1000);

}

}

catch(InterruptedException e)

{

}

}

public void paint(Graphics g)

{

String str = "是" + num;

g.drawString(str, x, 10);

}

}