import javax.swing.JTextArea;
import javax.swing.text.Element;
public class Main {
public static void main(String[] argv) throws Exception {
JTextArea textArea = new JTextArea("word1 word2\nword3\nword4");
Element paragraph = textArea.getDocument().getDefaultRootElement();
int contentCount = paragraph.getElementCount();
for (int i = 0; i < contentCount; i++) {
Element e = paragraph.getElement(i);
int rangeStart = e.getStartOffset();
int rangeEnd = e.getEndOffset();
String line = textArea.getText(rangeStart, rangeEnd - rangeStart);
System.out.println(line);
}
}
}