//Sample13_02.java

import java.io.File;
import java.io.IOException;

class Sample13_02{
    public static void main(String[] args){

      File dir01 = new File("dir01");
      File dir02 = new File("dir02");
      File file01 = new File("dir01/file.txt");
      File file02 = new File("dir02/file.txt");
      dir01.mkdir();
      dir02.mkdir();
      try{
          file01.createNewFile();
      }catch(IOException e){
          e.printStackTrace();
      }

      file01.renameTo(file02);
      System.out.println("dir02/file.txt: " + file02.exists());
    }
}