Test

 1public class Test {
 2    public static void main(String[] args){
 3        System.out.println (Math.ceil(-1.999999999991)); //1.0
 4        System.out.println (Math.ceil(1.999999999991));//2.0
 5        System.out.println (Math.floor(-1.00001));//-2.0
 6        System.out.println (Math.floor(1.00001));//1.0
 7        
 8        System.out.println (Math.ceil(0));//0.0
 9    }
}

SELECT 1 FROM DUAL;