Java round() Method: Usage and Examples

Description

This java tutorial shows how to use the round(float a) method of Math class under java.lang package. This method returns the absolute value of the double method argument.

The method round returns the closest long or int, as given by the methods return type.

Syntax

This method has the following variants ?

long round(double d)
int round(float f)

Parameters

Here is the detail of parameters ?

• d ? A double or float primitive data type.

• f ? A float primitive data type.

Return Value

• This method returns the closest long or int, as indicated by the method's return type, to the argument.

Example

public class MathRoundMethod {

   public static void main(String args[]) {
      double d = 120.675;
      double e = 130.500;
      float f = 120;
      float g = 91f;

      System.out.println(Math.round(d));
      System.out.println(Math.round(e));
      System.out.println(Math.round(f));
      System.out.println(Math.round(g));
   }
}

Output

121
131
120
91
Press any key to continue . . .

Example

public class RounFloatDoubleNumbersExample {

  public static void main(String[] args) {


     System.out.println(Math.round(10f));


     System.out.println(Math.round(20.5f));


     System.out.println(Math.round(20.5f));


     System.out.println(Math.round(-19.4f));


     System.out.println(Math.round(-23.5f));

  }
}

Output

10
21
21
-19
-23
Press any key to continue . . .