How to convert 2D ArrayList to String?

Question

I am trying to convert values of a 2D ArrayList to a string to that I can print them onto a JTextArea. However, everytime I run my program, the 2D ArrayList is still in the square brackets. Does anyone know a fix for this?

private void listButtonActionPerformed(java.awt.event.ActionEvent evt) {

    for (int row = 0; row <= count; row++) {

        employeeDisplay.setText(String.valueOf(employeeRecords.get(row)));

    }
}

When you say 2D ArrayList, do you have ArrayList< ArrayList<String>>? What does employeeRecords.get(row) return? — Makketronix
– Makketronix, Commented May 16, 2016 at 21:25
@Makketronix Yeah I have that setup, and the employeeRecords.get(row) is supposed to print each row of the 2D ArrayList into the JTextArea — spencerbro12
– spencerbro12, Commented May 16, 2016 at 21:32

PeaceIsPearl · Accepted Answer · 2016-05-16 21:58:13Z

1

Try this in your for loop :

StringBuilder builder = new StringBuilder();
for (String value : employeeRecords.get(row)) {
    builder.append(value);
}
String text = builder.toString();
employeeDisplay.setText(text);

OR

String formatedString = employeeRecords.get(row).toString()
    .replace(",", "")  //remove the commas
    .replace("[", "")  //remove the right bracket
    .replace("]", "")  //remove the left bracket
    .trim();  
employeeDisplay.setText(formatedString);

answered May 16, 2016 at 21:58

PeaceIsPearl

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2 Comments

spencerbro12 Over a year ago

The top one works for me, but is there any way to make a break to a new line after each row of the 2D array is printed? As of right now it is just printing all elements on the one line.

PeaceIsPearl Over a year ago

Add builder.append("\n"); after builder.append(value); hope it helps. Also, could you please accept the answer or upvote it. It helps other people to know that an answer has been found

Yassin Hajaj · Accepted Answer · 2016-05-16 22:05:51Z

1

If you're using java-8, you could use Collectors#joining

employeeDisplay.setText(employeeRecords.get(row)
                                       .stream()
                                       .collect(Collectors.joining(" "));

answered May 16, 2016 at 22:05

Yassin Hajaj

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