00000001.htm

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<TITLE>BBS水木清华站∶精华区</TITLE></HEAD><BODY><CENTER><H1>BBS水木清华站∶精华区</H1></CENTER>发信人:&nbsp;zixia&nbsp;(独守空房の比特仙子),&nbsp;信区:&nbsp;Java&nbsp;<BR>标&nbsp;&nbsp;题:&nbsp;来自&nbsp;JAVA&nbsp;的传说15.2&nbsp;<BR>发信站:&nbsp;BBS&nbsp;水木清华站&nbsp;(Tue&nbsp;May&nbsp;12&nbsp;19:13:27&nbsp;1998)&nbsp;<BR>&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;来&nbsp;自&nbsp;Java&nbsp;的&nbsp;传&nbsp;说&nbsp;(15)&nbsp;<BR>&nbsp;<BR>&nbsp;好&nbsp;啦&nbsp;！&nbsp;先&nbsp;来&nbsp;编&nbsp;个&nbsp;程&nbsp;序&nbsp;处&nbsp;理&nbsp;一&nbsp;下&nbsp;“&nbsp;按&nbsp;下&nbsp;鼠&nbsp;标&nbsp;<BR>”&nbsp;这&nbsp;个&nbsp;事&nbsp;件&nbsp;，&nbsp;亲&nbsp;自&nbsp;体&nbsp;验&nbsp;体&nbsp;验&nbsp;交&nbsp;互&nbsp;式&nbsp;程&nbsp;序&nbsp;到&nbsp;底&nbsp;怎&nbsp;么&nbsp;回&nbsp;<BR>事&nbsp;。&nbsp;这&nbsp;个&nbsp;程&nbsp;序&nbsp;会&nbsp;在&nbsp;你&nbsp;点&nbsp;鼠&nbsp;标&nbsp;的&nbsp;位&nbsp;置&nbsp;上&nbsp;显&nbsp;示&nbsp;一&nbsp;个&nbsp;小&nbsp;红&nbsp;<BR>叉&nbsp;，&nbsp;并&nbsp;告&nbsp;诉&nbsp;你&nbsp;这&nbsp;个&nbsp;小&nbsp;叉&nbsp;的&nbsp;位&nbsp;置&nbsp;，&nbsp;以&nbsp;及&nbsp;这&nbsp;是&nbsp;第&nbsp;几&nbsp;个&nbsp;小&nbsp;<BR>叉&nbsp;。&nbsp;<BR>程&nbsp;序&nbsp;17.1&nbsp;<BR>　&nbsp;　&nbsp;//&nbsp;mouse.java&nbsp;<BR>　&nbsp;　&nbsp;import&nbsp;java.awt.Graphics;&nbsp;<BR>　&nbsp;　&nbsp;import&nbsp;java.awt.Event;&nbsp;<BR>　&nbsp;　&nbsp;import&nbsp;java.awt.Color;&nbsp;<BR>　&nbsp;　&nbsp;public&nbsp;class&nbsp;mouse&nbsp;extends&nbsp;java.applet.Applet&nbsp;<BR>　&nbsp;　&nbsp;{&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;int&nbsp;num&nbsp;=&nbsp;0;　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;//&nbsp;设&nbsp;置&nbsp;计&nbsp;数&nbsp;器&nbsp;<BR>的&nbsp;初&nbsp;值&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;int&nbsp;px,py;&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;public&nbsp;boolean&nbsp;mouseDown(Event&nbsp;evt,int&nbsp;x,int&nbsp;y)&nbsp;　&nbsp;<BR>　&nbsp;//&nbsp;“&nbsp;鼠&nbsp;标&nbsp;按&nbsp;下&nbsp;”&nbsp;处&nbsp;理&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;{　&nbsp;　&nbsp;px&nbsp;=&nbsp;x;　&nbsp;　&nbsp;　&nbsp;　&nbsp;<BR>//&nbsp;取&nbsp;得&nbsp;按&nbsp;下&nbsp;鼠&nbsp;标&nbsp;时&nbsp;的&nbsp;坐&nbsp;标&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;py&nbsp;=&nbsp;y;&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;num++;　&nbsp;　&nbsp;　&nbsp;　&nbsp;//&nbsp;计&nbsp;数&nbsp;器&nbsp;加&nbsp;1&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;repaint(&nbsp;);　&nbsp;　&nbsp;//&nbsp;重&nbsp;画&nbsp;窗&nbsp;口&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;return&nbsp;true;　&nbsp;　&nbsp;//&nbsp;返&nbsp;回&nbsp;true&nbsp;，&nbsp;表&nbsp;明&nbsp;事&nbsp;件&nbsp;处&nbsp;<BR>理&nbsp;过&nbsp;了&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;}&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;public&nbsp;void&nbsp;update(Graphics&nbsp;g)&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;{&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;g.setColor(getBackground(&nbsp;));　&nbsp;　&nbsp;//&nbsp;用&nbsp;背&nbsp;景&nbsp;<BR>色&nbsp;刷&nbsp;出&nbsp;一&nbsp;块&nbsp;区&nbsp;域&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;g.fillRect(10,300,200,60);&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;paint(g);　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;//&nbsp;调&nbsp;用&nbsp;paint(&nbsp;)&nbsp;<BR>方&nbsp;法&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;}&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;public&nbsp;void&nbsp;paint(Graphics&nbsp;g)&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;{&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;g.setColor(Color.green);　&nbsp;　&nbsp;//&nbsp;设&nbsp;置&nbsp;当&nbsp;前&nbsp;画&nbsp;<BR>笔&nbsp;为&nbsp;绿&nbsp;色&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;g.drawString(&quot;The&nbsp;location&nbsp;of&nbsp;mark&nbsp;is&nbsp;<BR>(&quot;+px+&quot;,&quot;+py+&quot;)&quot;,10,320);&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;g.drawString(&quot;This&nbsp;is&nbsp;NO.&quot;+num+&quot;&nbsp;<BR>point&quot;,10,340);　&nbsp;　&nbsp;//&nbsp;输&nbsp;出&nbsp;点&nbsp;鼠&nbsp;标&nbsp;时&nbsp;的&nbsp;坐&nbsp;标&nbsp;值&nbsp;和&nbsp;点&nbsp;鼠&nbsp;标&nbsp;<BR>的&nbsp;次&nbsp;数&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;g.setColor(Color.red);　&nbsp;　&nbsp;//&nbsp;在&nbsp;点&nbsp;了&nbsp;鼠&nbsp;标&nbsp;的&nbsp;<BR>位&nbsp;置&nbsp;画&nbsp;一&nbsp;个&nbsp;小&nbsp;红&nbsp;叉&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;g.drawLine(px-5,py-5,px+5,py+5);&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;　&nbsp;g.drawLine(px+5,py-5,px-5,py+5);&nbsp;<BR>　&nbsp;　&nbsp;　&nbsp;　&nbsp;}&nbsp;<BR>　&nbsp;　&nbsp;}&nbsp;<BR>程&nbsp;序&nbsp;mouse.java&nbsp;的&nbsp;HTML&nbsp;文&nbsp;件&nbsp;如&nbsp;下&nbsp;所&nbsp;示&nbsp;<BR>这&nbsp;个&nbsp;程&nbsp;序&nbsp;的&nbsp;运&nbsp;行&nbsp;结&nbsp;果&nbsp;如&nbsp;图&nbsp;17.1&nbsp;所&nbsp;示&nbsp;。&nbsp;<BR>&nbsp;&nbsp;<BR>图&nbsp;17.1&nbsp;程&nbsp;序&nbsp;17.1&nbsp;的&nbsp;运&nbsp;行&nbsp;结&nbsp;果&nbsp;&nbsp;<BR>&nbsp;你&nbsp;看&nbsp;，&nbsp;我&nbsp;们&nbsp;在&nbsp;这&nbsp;个&nbsp;Java&nbsp;Applet&nbsp;的&nbsp;运&nbsp;行&nbsp;窗&nbsp;口&nbsp;里&nbsp;<BR>用&nbsp;小&nbsp;叉&nbsp;画&nbsp;了&nbsp;一&nbsp;个&nbsp;北&nbsp;斗&nbsp;星&nbsp;座&nbsp;。&nbsp;只&nbsp;要&nbsp;程&nbsp;序&nbsp;还&nbsp;在&nbsp;运&nbsp;行&nbsp;，&nbsp;你&nbsp;<BR>在&nbsp;这&nbsp;个&nbsp;Java&nbsp;Applet&nbsp;里&nbsp;所&nbsp;做&nbsp;的&nbsp;任&nbsp;何&nbsp;一&nbsp;个&nbsp;点&nbsp;鼠&nbsp;标&nbsp;操&nbsp;作&nbsp;都&nbsp;会&nbsp;<BR>被&nbsp;它&nbsp;用&nbsp;小&nbsp;红&nbsp;叉&nbsp;记&nbsp;录&nbsp;下&nbsp;来&nbsp;，&nbsp;并&nbsp;且&nbsp;告&nbsp;诉&nbsp;你&nbsp;点&nbsp;中&nbsp;的&nbsp;位&nbsp;置&nbsp;。&nbsp;<BR>试&nbsp;一&nbsp;试&nbsp;，&nbsp;是&nbsp;不&nbsp;是&nbsp;很&nbsp;有&nbsp;趣&nbsp;呢&nbsp;？&nbsp;&nbsp;<BR>&nbsp;运&nbsp;行&nbsp;完&nbsp;程&nbsp;序&nbsp;，&nbsp;我&nbsp;们&nbsp;再&nbsp;来&nbsp;看&nbsp;看&nbsp;程&nbsp;序&nbsp;里&nbsp;一&nbsp;些&nbsp;应&nbsp;该&nbsp;<BR>注&nbsp;意&nbsp;的&nbsp;地&nbsp;方&nbsp;。&nbsp;&nbsp;<BR>&nbsp;1.public&nbsp;boolean&nbsp;mouseDown&nbsp;(&nbsp;Event&nbsp;evt&nbsp;,&nbsp;int&nbsp;x&nbsp;,&nbsp;int&nbsp;y&nbsp;)&nbsp;{&nbsp;<BR>…&nbsp;…&nbsp;}&nbsp;<BR>&nbsp;这&nbsp;就&nbsp;是&nbsp;处&nbsp;理&nbsp;鼠&nbsp;标&nbsp;按&nbsp;下&nbsp;这&nbsp;一&nbsp;事&nbsp;件&nbsp;的&nbsp;方&nbsp;法&nbsp;，&nbsp;一&nbsp;旦&nbsp;<BR>鼠&nbsp;标&nbsp;被&nbsp;按&nbsp;下&nbsp;，&nbsp;系&nbsp;统&nbsp;就&nbsp;会&nbsp;自&nbsp;动&nbsp;去&nbsp;调&nbsp;用&nbsp;它&nbsp;，&nbsp;取&nbsp;得&nbsp;鼠&nbsp;标&nbsp;按&nbsp;<BR>下&nbsp;时&nbsp;的&nbsp;位&nbsp;置&nbsp;，&nbsp;并&nbsp;把&nbsp;计&nbsp;数&nbsp;器&nbsp;加&nbsp;1&nbsp;，&nbsp;然&nbsp;后&nbsp;调&nbsp;用&nbsp;repaint&nbsp;重&nbsp;画&nbsp;<BR>画&nbsp;面&nbsp;，&nbsp;最&nbsp;后&nbsp;返&nbsp;回&nbsp;true&nbsp;，&nbsp;告&nbsp;诉&nbsp;系&nbsp;统&nbsp;“&nbsp;鼠&nbsp;标&nbsp;按&nbsp;下&nbsp;”&nbsp;这&nbsp;一&nbsp;<BR>事&nbsp;件&nbsp;已&nbsp;经&nbsp;处&nbsp;理&nbsp;完&nbsp;毕&nbsp;。&nbsp;<BR>&nbsp;这&nbsp;个&nbsp;程&nbsp;序&nbsp;中&nbsp;，&nbsp;我&nbsp;们&nbsp;用&nbsp;了&nbsp;两&nbsp;个&nbsp;以&nbsp;前&nbsp;从&nbsp;来&nbsp;没&nbsp;有&nbsp;用&nbsp;<BR>过&nbsp;的&nbsp;类&nbsp;：&nbsp;java.awt.Point&nbsp;和&nbsp;java.awt.Event&nbsp;。&nbsp;Point&nbsp;对&nbsp;象&nbsp;用&nbsp;坐&nbsp;<BR>标&nbsp;（&nbsp;x&nbsp;,&nbsp;y&nbsp;)&nbsp;来&nbsp;表&nbsp;示&nbsp;一&nbsp;个&nbsp;点&nbsp;。&nbsp;Event&nbsp;就&nbsp;是&nbsp;本&nbsp;章&nbsp;的&nbsp;主&nbsp;角&nbsp;—&nbsp;—&nbsp;<BR>事&nbsp;件&nbsp;类&nbsp;。&nbsp;今&nbsp;后&nbsp;凡&nbsp;是&nbsp;和&nbsp;鼠&nbsp;标&nbsp;、&nbsp;键&nbsp;盘&nbsp;打&nbsp;交&nbsp;道&nbsp;的&nbsp;程&nbsp;序&nbsp;开&nbsp;始&nbsp;<BR>必&nbsp;须&nbsp;写&nbsp;这&nbsp;句&nbsp;话&nbsp;。&nbsp;&nbsp;<BR>&nbsp;2.import&nbsp;java.awt.Event&nbsp;;&nbsp;<BR>&nbsp;有&nbsp;一&nbsp;个&nbsp;update&nbsp;方&nbsp;法&nbsp;你&nbsp;可&nbsp;能&nbsp;从&nbsp;来&nbsp;没&nbsp;见&nbsp;过&nbsp;。&nbsp;update&nbsp;<BR>的&nbsp;意&nbsp;思&nbsp;就&nbsp;是&nbsp;“&nbsp;更&nbsp;新&nbsp;”&nbsp;。&nbsp;其&nbsp;实&nbsp;每&nbsp;次&nbsp;系&nbsp;统&nbsp;调&nbsp;用&nbsp;repaint&nbsp;的&nbsp;<BR>时&nbsp;候&nbsp;，&nbsp;repaint&nbsp;就&nbsp;自&nbsp;动&nbsp;先&nbsp;去&nbsp;调&nbsp;用&nbsp;update&nbsp;，&nbsp;然&nbsp;后&nbsp;再&nbsp;调&nbsp;用&nbsp;<BR>paint&nbsp;在&nbsp;纸&nbsp;上&nbsp;画&nbsp;画&nbsp;，&nbsp;这&nbsp;就&nbsp;是&nbsp;repaint&nbsp;的&nbsp;调&nbsp;用&nbsp;过&nbsp;程&nbsp;。&nbsp;系&nbsp;统&nbsp;<BR>缺&nbsp;省&nbsp;的&nbsp;update&nbsp;是&nbsp;用&nbsp;背&nbsp;景&nbsp;色&nbsp;把&nbsp;全&nbsp;部&nbsp;输&nbsp;出&nbsp;窗&nbsp;口&nbsp;都&nbsp;刷&nbsp;一&nbsp;遍&nbsp;<BR>。&nbsp;可&nbsp;是&nbsp;这&nbsp;个&nbsp;程&nbsp;序&nbsp;里&nbsp;，&nbsp;我&nbsp;们&nbsp;想&nbsp;保&nbsp;留&nbsp;每&nbsp;次&nbsp;画&nbsp;的&nbsp;小&nbsp;叉&nbsp;，&nbsp;唯&nbsp;<BR>一&nbsp;需&nbsp;要&nbsp;更&nbsp;新&nbsp;的&nbsp;是&nbsp;下&nbsp;面&nbsp;的&nbsp;输&nbsp;出&nbsp;信&nbsp;息&nbsp;，&nbsp;所&nbsp;以&nbsp;我&nbsp;们&nbsp;按&nbsp;照&nbsp;自&nbsp;<BR>己&nbsp;的&nbsp;需&nbsp;要&nbsp;改&nbsp;写&nbsp;了&nbsp;update&nbsp;，&nbsp;只&nbsp;让&nbsp;它&nbsp;更&nbsp;新&nbsp;写&nbsp;字&nbsp;的&nbsp;区&nbsp;域&nbsp;，&nbsp;<BR>而&nbsp;把&nbsp;画&nbsp;小&nbsp;叉&nbsp;的&nbsp;区&nbsp;域&nbsp;保&nbsp;留&nbsp;不&nbsp;变&nbsp;。（&nbsp;待&nbsp;续&nbsp;）&nbsp;&nbsp;<BR>--&nbsp;<BR>&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;爱情来得快去得也快，只有猪肉卷是永恒的.&nbsp;<BR>&nbsp;<BR>※&nbsp;来源:·BBS&nbsp;水木清华站&nbsp;bbs.net.tsinghua.edu.cn·[FROM:&nbsp;166.111.5.75]&nbsp;<BR><CENTER><H1>BBS水木清华站∶精华区</H1></CENTER></BODY></HTML>

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