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      class ConstructorTest
      {
       ConstructorTest()//¹¹Ô캯ÊýÊÇûÓзµ»ØÖµµÄ£¬×¢Òâ²»ÊÇvoidµÄ£¡
       {
        System.out.println("nothing!");
       }
       ConstructorTest(String s)
       {
        System.out.println(s);
       }
       public static void main(String args[])
       {
        new ConstructorTest();//µ±¶ÔÏóÉú³ÉµÄʱºò£¬ÏµÍ³»á×Ô¶¯µÄµ÷ÓÃËûµÄ¹¹Ô캯Êý
        new ConstructorTest("hello"); //²¢ÇÒ¹¹Ô캯Êý»¹¿ÉÒÔ½ÓÊÜÒýÊý£¬²úÉúÄãËùÏ£ÍûµÄÌØ¶¨µÄ¶ÔÏó¡£¼ÙÈçConstructorTest(String s)ÊÇΨһµÄ¹¹Ô캯Êý£¬ÄÇô±àÒëÆ÷²»ÔÊÐíÄãÒÔÈÎºÎÆäËûµÄ·½Ê½¿ª²úÉú¶ÔÏó
       }
      }
      ÓеÄÈË¿´µ½ÕâÀï¾ÍÊÇÒªÎÊÁË£¬ÎªÊ²Ã´ÎҵijÌÐò¾Í¸ù±¾Ã»Óж¨Òå¹ý¹¹Ô캯Êý£¬µ«ÊÇÎÒΪʲôÔÚ´´½¨¶ÔÏóµÄʱºòÒÀÈ»¿ÉÒÔʹÓÃËûÄØ£¿
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     class test
      {
       public static void main(String args[])
       {
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import java.io.FileNotFoundException;
import java.io.IOException;
public class FileByte {
private String filePath = "D:\\test.mdb";
private void getFileByte(){
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