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<div align="center" class="title">JAVA程序員必讀：基礎篇（2）面向對象編程概念</div>
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<div align="center"><font color="#666666">編譯：ZSC/太平洋網絡學院</font></div>
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<div align="right" class="gray"><a href="mailto:tntst@pconline.com.cn">［責編:爆破手］</a></div>
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<p><b><span class="article">2.7怎樣將這些面向對象的概念轉換為代碼</span></b></p>
<p><b><span class="article">2.7.1ClickMe的源代碼和Applet標簽</span></b></p>
<p class="article"> 為了編譯這個applet你需要兩個源文件：ClickMe.java和Spot.java。為了運行這個applet你需要利用這個applet標簽來創建一個html文件：</p>
<p class="article" align="center">
<textarea name="textfield" cols="75" rows="25"><applet code="ClickMe.class"
width="300" height="150">
</applet>
其中ClickMe.java的源代碼為：
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
public class ClickMe extends Applet implements MouseListener {
private Spot spot = null;
private static final int RADIUS = 7;
public void init() {
addMouseListener(this);
}
public void paint(Graphics g) {
//畫一個黑邊框和白背景
g.setColor(Color.white);
g.fillRect(0, 0, getSize().width - 1, getSize().height - 1);
g.setColor(Color.black);
g.drawRect(0, 0, getSize().width - 1, getSize().height - 1);
//畫紅點
g.setColor(Color.red);
if (spot != null) {
g.fillOval(spot.x - RADIUS, spot.y - RADIUS, RADIUS * 2, RADIUS * 2);
}
}
public void mousePressed(MouseEvent event) {
if (spot == null) {
spot = new Spot(RADIUS);
}
spot.x = event.getX();
spot.y = event.getY();
repaint();
}
public void mouseClicked(MouseEvent event) {}
public void mouseReleased(MouseEvent event) {}
public void mouseEntered(MouseEvent event) {}
public void mouseExited(MouseEvent event) {}
}
而Spot.java的源代碼為：
public class Spot {
public int size;
public int x, y;
public Spot(int intSize) {
size = intSize;
x = -1;
y = -1;
}
}</textarea>
</p>
<p class="article">然后裝載網頁到瀏覽器或者appletviewer工具。并且確保所有必要的文件都在相同的目錄中。
如圖11所示：</p>
<p></p>
<p class="article"><img src="../images/10717/Image49.gif" width=514 height=111></p>
<p></p>
<p class="article">（圖11）</p>
<p class="article"></p>
<p align="center" class="article"><a href="10722.htm">[上一頁]</a> <a href="10724.htm">[下一頁]</a></p>
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<p align="center" class="basicfont"><font color=#ff0000><b class="article">未經同意
不得轉載</b></font></p>
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