How to round integer in java

Question

I want to round the number 1732 to the nearest ten, hundred and thousand. I tried with Math round functions, but it was written only for float and double. How to do this for

Answer 1

Use Precision (Apache Commons Math 3.1.1)

Precision.round(double, scale); // return double
Precision.round(float, scale); // return float

Use MathUtils (Apache Commons Math) - Older versions

MathUtils.round(double, scale); // return double
MathUtils.round(float, scale); // return float

scale - The number of digits to the right of the decimal point. (+/-)

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Discarded because method round(float, scale) be used.

Math.round(MathUtils.round(1732, -1)); // nearest ten, 1730
Math.round(MathUtils.round(1732, -2)); // nearest hundred, 1700
Math.round(MathUtils.round(1732, -3)); // nearest thousand, 2000

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Better solution

int i = 1732;
MathUtils.round((double) i, -1); // nearest ten, 1730.0
MathUtils.round((double) i, -2); // nearest hundred, 1700.0
MathUtils.round((double) i, -3); // nearest thousand, 2000.0