How to add a line using JTextArea?

I want to add the message to a component from row start. which method can I use to add as line?
sirius

Thank you very much. Just now I try to append the control char in the end of str. It is successful. see the follow:
String CRLF = System.getProperty("line.separator")
//here the CRLF is control char.
while (true) {
JTextArea.append(Str + CRLF);
//next time the string can be appended from a new line. :)
//bow

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