ふぃぇ８ - 経済統計練習帳

package fileb;
 
 
import java.io.File;
 
public class pro {
   public static void main(String[] args) {
 
       File f=new File("gdata");
       String[] ff=f.list();
    int s;
       for(s=0;s<ff.length;s++){
      File fileA = new File("gdata/"+ff[s]);
 
      String str=ff[s].replace(".jpg","b.jpg");
 
      File fileB = new File("gdata/"+str);
 
 
      fileA.renameTo(fileB);
       }
 
 
              }
}