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package fileTest;
import java.io.*;
public class FileOperate {
   public FileOperate() {
   }
  
   public static void main(String args[]){
     //  newFolder("D:/100");
       moveFile("e:/9787030230621-tu06110101(sq) 1.pdf","d:/9787030230621-tu06110101(sq) 1.pdf");
   }
   /**
     * н¨Ä¿Â¼
     * @param folderPath String Èç c:/fqf
     * @return boolean
     */
   public static void newFolder(String folderPath) {
       try {
           String filePath = folderPath;
           filePath = filePath.toString();
           java.io.File myFilePath = new java.io.File(filePath);
           if (!myFilePath.exists()) {
               myFilePath.mkdir();
           }
       }
       catch (Exception e) {
           System.out.println("н¨Ä¿Â¼²Ù×÷³ö´í");
           e.printStackTrace();
       }
   }
   /**
     * н¨Îļþ
     * @param filePathAndName String Îļþ·¾¶¼°Ãû³Æ Èçc:/fqf.txt
     * @param fileContent String ÎļþÄÚÈÝ
     * @return boolean
     */
   public static void newFile(String filePathAndName, String fileContent) {
   


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JavaÎļþÖÐΪʲô»áÓÐserialVersionUID

һЩjavaÀàÖÐΪʲôÐèÒªÖØÔØ serialVersionUID ÊôÐÔ¡£
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java »ñÈ¡µ±Ç°Â·¾¶
 
1 ¡¢ÀûÓà System.getProperty() º¯Êý»ñÈ¡µ±Ç°Â·¾¶£º
System.out.println(System.getProperty("user.dir"));//user.dir Ö¸¶¨Á˵±Ç°µÄ·¾¶
 
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File directory = new File("");// É趨Ϊµ±Ç°Îļþ ......

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 //1.ÆÕͨµÄÖ±½ÓÒýÓÃ
class test {
   private int x,y;
   public test(int x,int y) {
       setX(x);//Ò²¿ÉÒÔдΪthis.setX(x);ÕâÖÖÇé¿öÏÂthis¿ÉÒÔÊ¡ÂÔ.
   }
}
//2.·½·¨ÖеÄij¸öÐβÎÃûÓ뵱ǰ¶ÔÏóµÄÄ ......

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1£©Êý¾Ý¿â²Ù×÷Àà,×ö¼òµ¥·â×° DB.java
package Test;
import java.sql.*;
public class DB {
 
 // ¼ÓÔØÇý¶¯
    static {
        try {
            Class.f ......
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