try{
 
           File justfile=new File("C:\\firstFolder\\justfile.txt");
 
           if(justfile.renameTo(new File("C:\\secondFolder\" + justfile.getName()))){
            System.out.println("Successful!");
           }else{
            System.out.println("Failed!");
           }
 
        }catch(Exception e){
            e.printStackTrace();
        }

        InputStream inputStream = null;
    OutputStream outputStream = null;
 
        try{
 
            File firstFile =new File("C:\\firstFolde\\file.txt");
            File secondFile =new File("C:\\secondFolder\\file.txt");
 
            inputStream = new FileInputStream(firstFile);
            outputStream = new FileOutputStream(secondFile);
 
            byte[] buffer = new byte[1024];
 
            int leng;

            while ((leng = inputStream.read(buffer)) > 0){
                outputStream.write(buffer, 0, leng);
            }
 
            inputStream.close();
            outputStream.close();

            firstFile.delete();
 
            System.out.println("Successful!");
 
        }catch(IOException e){
            e.printStackTrace();
        }