Multiline output in Netbeans?

I'm working on a program, with a GUI, that will need to output multiple lines to some kind of TextArea. I tried doing this with a JTextArea, but it turns out that when setting a new text to JTextArea, the old text gets deleted. Is it some kind of way to print multiple lines to a JTextArea? Or should I use an entirely different method/component for displaying text?

I hope this will clarify:

    for (int n = 0; n <= this.length; n++) {
        for (int m = 0; m <= that.length; m++) {
            txtaResult.setText("thisthis is " + n + "\n");

            Random randomGenerator = new Random();
            randomNumber = randomGenerator.nextInt(9)+1;
            txtaResult.setText(thatthat, " + m + ", is " + randomNumber\n");
        }
    }

(txtaResult is a JTextArea) So I want the text in the two txtaResult.setText to stay put in the JTextArea and add onto each other during all iterations.

Jon Skeet
people
quotationmark

Just use the append method instead of setText. Everything's behaving exactly as I'd expect it to - I would have been really surprised if setText had appended.

If you don't want to use append for some reason, you can call getText and concatenate the text yourself:

txtaResult.setText(textaResult.getText() + "whatever");

... but using append is cleaner and may be more efficient.

As an aside, your loop bounds look odd (usually you'd use < rather than <=) and it would be better to create a single instance of Random and call nextInt on it multiple times.

people

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