public   class  Test  extends  JFrame {


     public  Test() {
        setLayout( new  BorderLayout());

        StringBuilder builder =  new  StringBuilder();

        Random random =  new  Random();
         for  ( int  i =  0 ; i <  10 ; i++) {
            addRecord(builder, "debit" + i, random.nextInt( 1000 ), "desc" + i);
        }

        JTextPane pane =  new  JTextPane();

        pane.setText(builder.toString());

        getContentPane().add(pane, BorderLayout.CENTER);
    }
    
     private   void  addRecord(StringBuilder builder, String debit, Integer credit, String desc) {
        Formatter formatter =  new  Formatter();
        formatter.format("%-20s %04d %50s\n", debit, credit, desc);
        builder.append(formatter.toString());
    }

     public   static   void  main(String[] args) {
        Test test =  new  Test();
        test.setSize( 800 ,  600 );
        test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        test.setVisible(true);
    }
}