Java.lang.Math.round() Method


The java.lang.Math.round(float a) returns the closest int to the argument. The result is rounded to an integer by adding 1/2, taking the floor of the result, and casting the result to type int. Special cases −

  • If the argument is NaN, the result is 0.

  • If the argument is negative infinity or any value less than or equal to the value of Integer.MIN_VALUE, the result is equal to the value of Integer.MIN_VALUE.

  • If the argument is positive infinity or any value greater than or equal to the value of Integer.MAX_VALUE, the result is equal to the value of Integer.MAX_VALUE.


Following is the declaration for java.lang.Math.round() method

public static int round(float a)


a − a floating-point value to be rounded to an integer.

Return Value

This method returns the value of the argument rounded to the nearest int value.




The following example shows the usage of lang.Math.round() method.

package com.tutorialspoint;

import java.lang.*;

public class MathDemo {

   public static void main(String[] args) {

      // get two float numbers
      float x = 1654.9874f;
      float y = -9765.134f;

      // find the closest int for these floats
      System.out.println("Math.round(" + x + ")=" + Math.round(x));
      System.out.println("Math.round(" + y + ")=" + Math.round(y));

Let us compile and run the above program, this will produce the following result −