JTextArea输出

Question

Good Evening, What can I do to have the output from jTExtArea like in the console? You can see the image how it is, I use .append to show the output in jTextArea Image

Code:

 public void actionPerformed(ActionEvent e) {
        if (e.getSource() == b1) {

            for (int i = 0; i < a.pattern_cnt; i++) {
                for (int j = 0; j < a.T_element_cnt; j++) {
                 System.out.printf("%.3f\t", a.O[i][j]); //console output

                 t1.append(a.O[i][j]+" ");//jtextarea output
                }

                System.out.println();


            }

Answer 1

Set the font to monospaced.

t1.setFont(new Font(Font.MONOSPACED, Font.PLAIN, 12));

Edit:

And add new line in main iteration and use string format.

        for (int i = 0; i < a.pattern_cnt; i++) {
            for (int j = 0; j < a.T_element_cnt; j++) {
             System.out.printf("%.3f\t", a.O[i][j]); //console output

             t1.append(String.format("%.3f\t", a.O[i][j]));//jtextarea output
            }

            System.out.println();
            t1.append("\n");

        }