How do I get the date and my counts on same line in java?

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Java

Eclipse

I am trying to get my java code to write the counts from a GUI to a .txt file. I want the code to write date and time first and then on the same line, I want it to write the counts.

Something like this:

07/12/2018 11:20:56AM, 4500, 5000, 6500

07/12/2018 11:20:58AM, 4500, 5000, 6500

and so on.

But what I am getting is:

07/12/2018 11:20:56 AM,
4500,5000,6500
07/12/2018 11:20:56 AM,
4500,5000,6500

I do not know why there is a line break after the date and time stamp.

I have attached my code below:

What I have tried:

pollTimer.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent evt) {
				try {
					if(r.read(POLL_FLAG_ADDRESS) != 0) 
					
					{ // if the data ready flag is up
						
						if(tglbtnWrite.isSelected() && (intervalCounter%requiredParams[2] == 0))
							printw.printf(dtf.format(LocalDateTime.now()) + ","); //For every new line of counts, shows current date and and time of the system.
						r.write(POLL_FLAG_ADDRESS,0); // put it back down
						intervalCounter++; // increment interval counter (gets reset by GO/STOP toggle)
						for(int i = 0; i < MAX_WIDGETS; i++) { // loop through all widgets
							NumWidget tmp = numwid.get(i);
							if((tmp.getState() != 0) && (tmp.getState() != 16)) { // check if widget is configured for a channel
								tmp.setAcc(tmp.getAcc() + r.read(translate[tmp.getState() - 1])); // if it is, poll the respective register
								if(intervalCounter%requiredParams[2] == 0) { // check if we have reached integration interval									
									tmp.setTextFieldText(String.format("%,d", tmp.getAcc())); // if so, update display
									if(tglbtnWrite.isSelected())
									 	printw.printf(tmp.getAcc()+ ","); // if write enabled, write to disk
										tmp.setAcc(0); // reset accumulator
										
								
								}
							
								
							}
							// if this widget holds a user parameter and write is enabled, write parameter to file
							if(tmp.getLabelPEnabled() && tglbtnWrite.isSelected()) printw.printf(tmp.getTextFieldText()+",");
						}
						if(tglbtnWrite.isSelected()) 
							printw.printf("\r\n"); // if write enabled, end line/carriage return
						if(intervalCounter == requiredParams[3]) {
							pollTimer.stop(); // if we are at max data points, stop (always fails if data points > 0)
						// reset GO button to stopped state
							btnGO.setText("GO");
							btnGO.setForeground(Color.GREEN);
							btnGO.setSelected(false);
						}
					}
				} catch (SerialPortException e) {
					e.printStackTrace();
				} catch (SerialPortTimeoutException e) {
					e.printStackTrace();
				}
			}
		});