Java/Development Class/ChoiceFormat

Get the smallest double greater than d

 
import java.text.ChoiceFormat;
public class Main {
  public static void main(String[] argv) throws Exception {
    double d = 1.2;
    double d2 = ChoiceFormat.nextDouble(d);
    System.out.println(d2);
  }
}
//1.2000000000000002

Incrementing a Double by the Smallest Possible Amount

 
import java.text.ChoiceFormat;
public class Main {
  public static void main(String[] argv) throws Exception {
    double d = 1.2;
    // Get the largest double less than d
    double d1 = ChoiceFormat.previousDouble(d);
    System.out.println(d1);
  }
}
//1.1999999999999997