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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">2.7.6 ClickMe Applet中的接口</span></b></p>
<p class="article"> ClickMe applet是通過在鼠標點擊出顯示一個紅點來響應鼠標的點擊事件。如果對象想通知鼠標點擊，JAVA平臺事件系統需要對象執行MouseListener接口。這個對象必須同時作為鼠標監聽器來注冊。</p>
<p class="article"> 這個MouseListener接口聲明了五種不同的志芋工，每種方法是用在鼠標被點擊的時候對不同鼠標事件的調用。當鼠標被點擊的時候，或者當鼠標移動到applet外面的時候等等。
</p>
<p class="article"> 下面是ClickMe applet完整的代碼。其中mousePressed是處理鼠標事件的：</p>
<p class="article" align="center">
<textarea name="textfield" cols="75" rows="25">
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) {
// 畫一個黑色邊框和一個白色背景
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);
//畫一個點
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) {}
}</textarea>
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