Math.nextUp : Math Functions « Development « Java Tutorial

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public class FloastPointDemo {
  public static void main(String[] args) {
    // Returns the greater adjacent of a double
    double greaterAdjacent = Math.nextUp(123.0);
    System.out.println("Math.nextUp (123.0) = " + greaterAdjacent);
  }
}

//

Math.nextUp (123.0) = 123.00000000000001