How to Accurately Round Doubles to Two Decimal Places in Java?

Rounding Up to 2 Decimal Places in Java

This question addresses the challenge of rounding double values to two decimal places in Java. The code snippet provided attempts to use Math.round() for rounding, but the output is incorrect.

The solution to this problem lies in understanding the precision of Math.round(). By default, it rounds to the nearest integer. To obtain two decimal places, the value must be scaled appropriately.

One viable approach involves multiplying the double by 100 before rounding and then dividing by 100 to preserve the precision:

double roundOff = Math.round(a * 100.0) / 100.0;

This method ensures that the rounding is performed to two decimal places.

Alternatively, casting the result of Math.round() to a double can also achieve the desired result:

double roundOff = (double) Math.round(a * 100) / 100;

Both these approaches accurately round the specified double value to two decimal places, delivering the intended output.

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