String/Number formatting

How can I format a number in java so that only two numbers are displayed after the decimal point?

I have tried using DecimalFormat with no luck.

Here is the code I used.

Code:

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float newTotPrice = totPrice + Double.valueOf(myProduct.getPrice()).floatValue();
//For formatting a number
DecimalFormat df = new DecimalFormat("#.00");
//Format 'newTotPrice' so that only two digits are shown after the decimal point
df.format(newTotPrice);
//Show total price
lblTotPrice.setText("£ " + newTotPrice);

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This doesn't work as I got a result of "£ 509.97003"

Code:

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import java.text.DecimalFormat;
import java.text.NumberFormat;


public class Util {

    public static void main(String[] args) {
        double d = 10.45;
        NumberFormat formatter = DecimalFormat.getNumberInstance();
        formatter.setMaximumFractionDigits(2);
        System.out.println(formatter.format(Math.PI));
    }
}

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When the number of more than 999 the formatter seems to put a comma in. How can I set it so that it doesn't do this?

E.g. 1,023.23 should be 1023.23

Code:

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formatter.setGroupingUsed(false);

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