How to get text in Next line of Label

Question

Hi,
I am trying to write a code where when I press Enter the text in the text box appear on next line of label. However every new text is getting printed on the same line..
Here is my code:
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class ChatBox extends Applet implements ActionListener
  TextField firstNum, secondNum, resultNum;
  Label label1;
  String str1 = "Start Chatting";
  public ChatBox()
  //setLayout(new GridLayout(3, 2, 10, 15));
  setBackground(Color.cyan);  
  String message;
  message = "Start Typing and see the magic";
  setLayout(new GridLayout(2,1,10,120)); //, 10, 15));
  setBackground(Color.cyan);  
  firstNum = new TextField(5);
  firstNum.addActionListener(this); 
  label1 = new Label(firstNum.getText());
  add(label1);
  add(firstNum);
  public void actionPerformed(ActionEvent e)
  String newline = System.getProperty("line.separator");
  //String message = "Start Typing and see the magic";
  str1 = str1+ newline + firstNum.getText();
  firstNum.setText("");
  //message = message + str1;
  label1.setText( str1 );

Answer 1

Is it not possible?
Kindly guide with an alternative way to do this.