public class JTextAreaTest extends JFrame{
    public JTextAreaTest() {
        // TODO Auto-generated constructor stub
    setSize(200,100);
    setTitle("定義自動換行的文本域");
    setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    Container c = getContentPane();
    JTextArea jt = new JTextArea("文本域",6,6);
    jt.setLineWrap(
 
true);
    c.add(jt);
    setVisible(true);
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
    new JTextAreaTest();
    }
}

文本域組件