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<title>●试题七</title>
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<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>●试题七</span></p>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>【说明】</span></p>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>下面是一个</span><span lang=EN-US>Applet</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>程序，其功能是从</span><span lang=EN-US>3~100</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>之间（包括</span><span lang=EN-US>3</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>和</span><span
lang=EN-US>100</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>）每隔</span><span lang=EN-US>0.5</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>秒显示一个新的数字，如果数字为素数，则显示为灰色，其他为绿色。</span></p>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>程序运行结果如图</span><span lang=EN-US>4</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>所示。</span></p>
<p class=MsoNormal><span lang=EN-US>import java.awt.*;</span></p>
<p class=MsoNormal><span lang=EN-US>import java.applet.Applet;</span></p>
<p class=MsoNormal><span lang=EN-US>/*</span></p>
<p class=MsoNormal><span lang=EN-US><applet code=ex2_7.class width=800
height=400></span></p>
<p class=MsoNormal><span lang=EN-US></applet></span></p>
<p class=MsoNormal><span lang=EN-US><!--[if gte vml 1]><v:shapetype id="_x0000_t75"
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filled="f" stroked="f">
<v:stroke joinstyle="miter"/>
<v:formulas>
<v:f eqn="if lineDrawn pixelLineWidth 0"/>
<v:f eqn="sum @0 1 0"/>
<v:f eqn="sum 0 0 @1"/>
<v:f eqn="prod @2 1 2"/>
<v:f eqn="prod @3 21600 pixelWidth"/>
<v:f eqn="prod @3 21600 pixelHeight"/>
<v:f eqn="sum @0 0 1"/>
<v:f eqn="prod @6 1 2"/>
<v:f eqn="prod @7 21600 pixelWidth"/>
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<v:f eqn="prod @7 21600 pixelHeight"/>
<v:f eqn="sum @10 21600 0"/>
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height:141.75pt'>
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</v:shape><![endif]--><![if !vml]><img width=181 height=189
src="./Question_7.files/image002.jpg" v:shapes="_x0000_i1025"><![endif]></span></p>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>图</span><span lang=EN-US>4</span></p>
<p class=MsoNormal><span lang=EN-US>*/</span></p>
<p class=MsoNormal><span lang=EN-US>public class ex2_7 extends Applet { </span></p>
<p class=MsoNormal><span lang=EN-US>public Color color2_7 = Color.black;</span></p>
<p class=MsoNormal><span lang=EN-US>private int n2_7 = 3;</span></p>
<p class=MsoNormal><span lang=EN-US>public myPrime<span style="mso-spacerun:
yes"> </span>thPrime2_7;</span></p>
<p class=MsoNormal><span lang=EN-US>public void init() {</span></p>
<p class=MsoNormal><span lang=EN-US>thPrime2_7 = new myPrime(this);</span></p>
<p class=MsoNormal><span lang=EN-US>thPrime2_7.start();</span></p>
<p class=MsoNormal><span lang=EN-US>}</span></p>
<p class=MsoNormal><span lang=EN-US>public void paint(Graphics g) {</span></p>
<p class=MsoNormal><span lang=EN-US>g.setColor(color2_7);</span></p>
<p class=MsoNormal><span lang=EN-US>g.drawstring(<u> (1) </u><span
style="mso-spacerun: yes"> </span>,50, 50);</span></p>
<p class=MsoNormal><span lang=EN-US>}</span></p>
<p class=MsoNormal><span lang=EN-US>public int getInt(){</span></p>
<p class=MsoNormal><span lang=EN-US>return n2_7;</span></p>
<p class=MsoNormal><span lang=EN-US>}</span></p>
<p class=MsoNormal><span lang=EN-US>public void setInt(int i){</span></p>
<p class=MsoNormal><span lang=EN-US>n2_7=i;</span></p>
<p class=MsoNormal><span lang=EN-US>}</span></p>
<p class=MsoNormal><span lang=EN-US>}</span></p>
<p class=MsoNormal><span lang=EN-US>class myPrime extends Thread {</span></p>
<p class=MsoNormal><span lang=EN-US>ex2_7 obj2_7;</span></p>
<p class=MsoNormal><span lang=EN-US>myPrime (ex2_7 o) {</span></p>
<p class=MsoNormal><span lang=EN-US>this.obj2_7 = o;</span></p>
<p class=MsoNormal><span lang=EN-US>}</span></p>
<p class=MsoNormal><span lang=EN-US>public boolean isPrime(int n) {</span></p>
<p class=MsoNormal><span lang=EN-US>boolean bPrime = true;</span></p>
<p class=MsoNormal><span lang=EN-US>int i=2;</span></p>
<p class=MsoNormal><span lang=EN-US>if(</span><u><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>（</span><span
lang=EN-US>2</span></u><u><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>）</span></u><span
lang=EN-US>)</span></p>
<p class=MsoNormal><span lang=EN-US>return false;</span></p>
<p class=MsoNormal><span lang=EN-US>while(i<n-1&&bPrime){</span></p>
<p class=MsoNormal><span lang=EN-US>if (</span><u><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>（</span><span
lang=EN-US>3</span></u><u><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>）</span></u><span
lang=EN-US>)</span></p>
<p class=MsoNormal><span lang=EN-US>bPrime = false;</span></p>
<p class=MsoNormal><span lang=EN-US>i++;</span></p>
<p class=MsoNormal><span lang=EN-US>}<span style="mso-spacerun:
yes"> </span></span></p>
<p class=MsoNormal><span lang=EN-US>return bPrime;</span></p>
<p class=MsoNormal><span lang=EN-US>}</span></p>
<p class=MsoNormal><span lang=EN-US>public void run() {</span></p>
<p class=MsoNormal><span lang=EN-US>int i;</span></p>
<p class=MsoNormal><span lang=EN-US>for (i = 3;</span><u><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>（</span><span lang=EN-US>4</span></u><u><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>）</span></u><span lang=EN-US>; i++) {</span></p>
<p class=MsoNormal><span lang=EN-US>if (isPrime(i)) </span></p>
<p class=MsoNormal><span lang=EN-US>obj2_7.color2_7 = Color.gray;</span></p>
<p class=MsoNormal><span lang=EN-US>else</span></p>
<p class=MsoNormal><span lang=EN-US>obj2_7.color2_7 = Color.green;</span></p>
<p class=MsoNormal><u><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>（</span><span lang=EN-US>5</span></u><u><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>）</span></u><span lang=EN-US>;</span></p>
<p class=MsoNormal><span lang=EN-US>obj2_7.repaint();</span></p>
<p class=MsoNormal><span lang=EN-US>try {</span></p>
<p class=MsoNormal><span lang=EN-US>sleep(500);</span></p>
<p class=MsoNormal><span lang=EN-US>} catch (InterruptedException ie) {</span></p>
<p class=MsoNormal><span lang=EN-US>}<span style="mso-spacerun:
yes"> </span></span></p>
<p class=MsoNormal><span lang=EN-US>}</span></p>
<p class=MsoNormal><span lang=EN-US>}</span></p>
<p class=MsoNormal><span lang=EN-US>}</span></p>
<p class=MsoNormal><span lang=EN-US>ex2_7.html</span></p>
<p class=MsoNormal><span lang=EN-US><HTML></span></p>
<p class=MsoNormal><span lang=EN-US><HEAD></span></p>
<p class=MsoNormal><span lang=EN-US><TITLE>ex2_7</TITLE></span></p>
<p class=MsoNormal><span lang=EN-US></HEAD></span></p>
<p class=MsoNormal><span lang=EN-US><BODY></span></p>
<p class=MsoNormal><span lang=EN-US><applet<span style='mso-tab-count:1'> </span>code="ex2_7.class"
width=800 height=400 ></span></p>
<p class=MsoNormal><span lang=EN-US></applet></span></p>
<p class=MsoNormal><span lang=EN-US></BODY></span></p>
<p class=MsoNormal><span lang=EN-US></HTML></span></p>
</div>
</body>
</html>
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