Formatting double to 2 decimals doesn't work

Question

I want to round this double:

3.499999999999999

to:

3.50

And I already used these two methods:

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Answer 1

Did you try replacing the 0's with #'s?

DecimalFormat df = new DecimalFormat("#.##"); System.out.println(df.format(input));

According to here the # will be resolved to 0 if the digit is absent