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public static void DownLoadPages(String urlStr, String outPath)
     {
         int chByte = 0;
         URL url = null;
         HttpURLConnection httpConn = null;
         InputStream in = null;
         FileOutputStream out = null;
         try
         {
             url = new URL(urlStr);
             httpConn = (HttpURLConnection) url.openConnection();
             HttpURLConnection.setFollowRedirects(true);
             httpConn.setRequestMethod("GET");
             httpConn.setRequestProperty("User-Agent","Mozilla/4.0 (compatible; MSIE 6.0; Windows 2000)");
            
             // logger.info(httpConn.getResponseMessage());
             in = httpConn.getInputStream();
             out = new FileOutputStream(new File(outPath));
             chByte = in.read();
             while (chByte != -1)
             {
                 out.write(chByte);
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import javax.swing.JOptionPane;
public class T6 {
 public static void main(String args[]) {
  String s = JOptionPane.showInputDialog("ÇëÊäÈëÔ²Ãæ»ý£º");
  double Area = Double.parseDouble(s);
  double r;
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/**
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